From 7c0891deda3cde2f4cb2f6e0f6c21571876c2364 Mon Sep 17 00:00:00 2001
From: German Khokhlov <ouchlock@gmail.com>
Date: Sat, 17 Oct 2026 04:52:15 +0400
Subject: [PATCH] refactor(military): Cesium rendering behind a renderer
 interface
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Task 11a. The military flights logic no longer imports Cesium: it draws
through the shared aircraft renderer (src/layers/aircraft/render/cesium.js)
with the military's parameters in src/layers/military/render/cesium.js
(sprite-order slot 'military', jet.glb's 180° nose offset), registered for
'cesium' in the renderer registry and created at init(viewer, {engine}).
The same pure move as flights in 10a:

- Fleet: the BillboardCollection and its sprite-order slot (enable keeps
  restoreSpriteOrder, as before); sprites stay Billboard handles.
- Models: fleet/tracked/preload glTF loads (asynchronous:false, MIX tint at
  MODEL_COLOR_BLEND_AMOUNT, IR boost as `unlit` → the UNLIT CustomShader),
  the model collection, setPose. The per-class specs keep their own nose
  offset: setPose takes an optional offsetDeg (default the layer's), on
  both aircraft renderers (same arithmetic, test added).
- Tracked: the ENU billboard Entity with its position/colour/rotation
  callbacks (#FFD166, transparent amber once the model owns the visual),
  viewFrom, followed through viewer.trackedEntity + the one exact tracked
  frame; refocusTrackedById through follow.refocus.
- Trail: the entity trail and the floored live head segment.
- View: camera/scene reads, frame number, frustum and horizon tests,
  render requests, frame events.
- Clicks and Escape go through the engine's selection dispatcher (the
  ScreenSpaceEventHandler and keydown listener are gone); the cross-layer
  untrack watches the renderer's follow. Same rules: cockpit clicks are
  inert, the tracked visual/model is a no-op, another layer's pick is not
  empty space, an unowned pick is.
- Colours are engine-neutral Rgba (MIL_ICON_COLOR #FFB800,
  TRACKED_ICON_COLOR #FFD166, AMBER_TRANSPARENT), NearFarScalar →
  nearFarScale; Cesium math → src/geo.
- check-import-directions: src/layers/military/ joins the rendered layers
  (cesium only in render/cesium*.js).
- The military registry and the flights' duplicate suppression are
  untouched.

Source-text tests updated with the moved code, same meaning:
- militaryAwareness.test: military's hasContact guard reads fleet.visible().
- trackingClickGesture.test: the military gesture rules are the
  dispatcher's (selection gesture before select, click classifier before
  the empty-space clear), military answers the empty click with a
  user-origin clear — the same assertion flights already had.
- ownership.test: the services fixture names selection and renderer; the
  app-composed services build the layer's Cesium renderer.
- renderers.test: flights and military have extracted Cesium renderers.

New tests: the military logic over a plain-data renderer and a fake engine
(amber fleet, click-select, #FFD166 tracked glyph, no-op on the tracked
visual, empty-click and Escape release, the keyboard left on destroy); the
plain-data renderer moved to src/testSupport for both aircraft layers;
setPose with a per-model offset.

W1 replay vs 7c7422e2 (the 10a reference run): every layer's counts, known
objects, screen points, tracking pose after 2 s, requests and the
city/global/orbit shots (sha256) identical. qa-military-names (it checks
the installations layer): the same verdict as 7c7422e2 (the zoom-markers
assertion fails on both). Main chunk 2,890,763 B (−2.9 KB).
---
 scripts/check-import-directions.mjs           |   1 +
 scripts/format-scope.json                     |   3 +
 scripts/package-boundaries.json               |   5 +-
 src/app/layers/militaryFlights.js             |  22 +-
 src/app/layers/renderers.js                   |   2 +
 src/app/layers/renderers.test.mjs             |  10 +-
 src/data/militaryAwareness.test.mjs           |   3 +-
 src/data/trackingClickGesture.test.mjs        |  17 +-
 src/layers/aircraft/render/cesium.js          |   9 +-
 src/layers/aircraft/render/cesium.test.mjs    |  17 +
 src/layers/aircraft/render/contract.js        |   3 +-
 src/layers/aircraft/render/navara.js          |   9 +-
 src/layers/flights/renderer.test.mjs          | 118 +---
 src/layers/military/lifecycle.js              | 147 ++---
 src/layers/military/motion.js                 |  29 +-
 src/layers/military/ownership.test.mjs        |  19 +-
 src/layers/military/policy.js                 |  24 +-
 src/layers/military/queries.js                |  38 +-
 src/layers/military/render/cesium.js          |  24 +
 src/layers/military/renderer.test.mjs         | 142 +++++
 src/layers/military/rendering.js              | 227 +++-----
 src/layers/military/snapshotRenderer.js       |  41 +-
 src/layers/military/state.js                  |  77 +--
 src/layers/military/testing.js                |   8 +-
 src/layers/military/tracking.js               | 515 ++++++++----------
 src/testSupport/aircraftRecordingRenderer.mjs | 122 +++++
 26 files changed, 829 insertions(+), 803 deletions(-)
 create mode 100644 src/layers/military/render/cesium.js
 create mode 100644 src/layers/military/renderer.test.mjs
 create mode 100644 src/testSupport/aircraftRecordingRenderer.mjs

diff --git a/scripts/check-import-directions.mjs b/scripts/check-import-directions.mjs
index 394e9f70b..630c7bb49 100644
--- a/scripts/check-import-directions.mjs
+++ b/scripts/check-import-directions.mjs
@@ -35,6 +35,7 @@ const navaraPackage = /^(?:(?:three|postprocessing)(?:\/|$)|@navaramap\/)/;
 // Navara only in render/navara*.js. The list grows with each moved layer.
 const RENDERED_LAYER_DIRS = [
   'src/layers/flights/',
+  'src/layers/military/',
   'src/layers/aircraft/',
   'src/layers/shared/',
 ];
diff --git a/scripts/format-scope.json b/scripts/format-scope.json
index 0559e8e57..d851aebc7 100644
--- a/scripts/format-scope.json
+++ b/scripts/format-scope.json
@@ -326,6 +326,8 @@
   "src/layers/aircraft/render/navara.test.mjs",
   "src/layers/aircraft/render/navara.js",
   "src/layers/flights/renderer.test.mjs",
+  "src/layers/military/renderer.test.mjs",
+  "src/testSupport/aircraftRecordingRenderer.mjs",
   "src/layers/aircraft/render/cesium.test.mjs",
   "src/layers/aircraft/render/cesium.js",
   "src/layers/aircraft/render/contract.js",
@@ -348,6 +350,7 @@
   "src/layers/military/ingestion.js",
   "src/layers/military/queries.js",
   "src/layers/military/index.js",
+  "src/layers/military/render/cesium.js",
   "src/layers/aircraft/index.js",
   "src/layers/aircraft/classification.js",
   "src/layers/military/ownership.test.mjs",
diff --git a/scripts/package-boundaries.json b/scripts/package-boundaries.json
index 7ae5e19ce..95855dce0 100644
--- a/scripts/package-boundaries.json
+++ b/scripts/package-boundaries.json
@@ -935,6 +935,7 @@
       "src/layers/military/records.js",
       "src/layers/military/recordPolicy.js",
       "src/layers/military/snapshotRenderer.js",
+      "src/layers/shared/color.js",
       "src/data/inputOwnership.js",
       "src/data/modelEligibility.js",
       "src/geo/index.js",
@@ -2591,6 +2592,7 @@
       "src/app/layers/renderers.js",
       "src/layers/aircraft/render/cesium.js",
       "src/layers/flights/render/cesium.js",
+      "src/layers/military/render/cesium.js",
       "src/data/selectionDispatcher.js",
       "src/layers/shared/color.js",
       "src/layers/aircraft/render/navara.js",
@@ -3169,7 +3171,8 @@
       "src/layers/aircraft/render/cesium.js",
       "src/data/selectionDispatcher.js",
       "src/layers/shared/color.js",
-      "src/layers/flights/render/cesium.js"
+      "src/layers/flights/render/cesium.js",
+      "src/layers/military/render/cesium.js"
     ],
     "external": [
       "hls.js",
diff --git a/src/app/layers/militaryFlights.js b/src/app/layers/militaryFlights.js
index f66689562..d58e40459 100644
--- a/src/app/layers/militaryFlights.js
+++ b/src/app/layers/militaryFlights.js
@@ -1,10 +1,10 @@
 import { createMilitaryFlightLayer } from '../../layers/military/index.js';
 import * as picking from '../../data/pickRegistry.js';
-import * as sprites from '../../data/spriteOrder.js';
-import * as trails from '../../data/trailRenderer.js';
+import * as selection from '../../data/selectionDispatcher.js';
 import * as aircraftPresentation from '../../data/tr3bRegistry.js';
 import * as trackedCamera from '../../data/trackedCamera.js';
-import { applyTrackedCameraFrame } from '../../globe/cesium/follow.js';
+import { rendererFor } from './renderers.js';
+import { createMilitaryCesiumRenderer } from '../../layers/military/render/cesium.js';
 import * as labels from '../../data/detectionDraw.js';
 import * as geoid from '../../data/geoid.js';
 import * as focus from '../../data/focusDeemphasis.js';
@@ -20,6 +20,13 @@ export function createApplicationMilitary({
   militaryRegistry,
   resolveAsset = (url) =>
     `${import.meta.env?.BASE_URL || '/'}${url.replace(/^\//, '')}`,
+  // Test seam: the renderer factory (default: the engine's, from the registry).
+  renderer = {
+    create: ({ viewer, engine = null, adopt }) =>
+      engine
+        ? rendererFor('military', engine, { viewer, adopt })
+        : createMilitaryCesiumRenderer(null, { viewer, adopt }),
+  },
 }) {
   const { groundFloor, meshFloor, groundSnap } = surface;
   return createMilitaryFlightLayer({
@@ -27,10 +34,13 @@ export function createApplicationMilitary({
     resolveAsset,
     services: {
       picking,
-      sprites,
-      trails,
+      selection,
+      // The engine's military renderer from the registry (render/cesium.js
+      // on Cesium); a bare viewer without an engine (unit tests) draws on
+      // Cesium.
+      renderer,
       aircraftPresentation,
-      camera: { ...trackedCamera, applyTrackedCameraFrame },
+      camera: trackedCamera,
       militaryRegistry,
       labels,
       groundFloor,
diff --git a/src/app/layers/renderers.js b/src/app/layers/renderers.js
index 67cda281a..95fb252a8 100644
--- a/src/app/layers/renderers.js
+++ b/src/app/layers/renderers.js
@@ -25,6 +25,7 @@
 
 import { APPLICATION_LAYER_DIRECTORY } from './directory.js';
 import { createFlightsCesiumRenderer } from '../../layers/flights/render/cesium.js';
+import { createMilitaryCesiumRenderer } from '../../layers/military/render/cesium.js';
 
 const ENGINE_KINDS = new Set(['cesium', 'navara']);
 
@@ -85,6 +86,7 @@ export const layerAvailableOn = (layerId, engineKind) =>
 /** Cesium renderers extracted from their layers (render/cesium.js). */
 export const CESIUM_LAYER_RENDERERS = Object.freeze({
   flights: createFlightsCesiumRenderer,
+  military: createMilitaryCesiumRenderer,
 });
 
 // The other application layers still draw themselves on Cesium.
diff --git a/src/app/layers/renderers.test.mjs b/src/app/layers/renderers.test.mjs
index 10f8ebc19..a45784824 100644
--- a/src/app/layers/renderers.test.mjs
+++ b/src/app/layers/renderers.test.mjs
@@ -56,12 +56,18 @@ test('the default registry: every layer on Cesium, none yet on Navara', () => {
   }
 });
 
-test('flights has an extracted Cesium renderer; the others still draw themselves', () => {
-  assert.deepEqual(Object.keys(CESIUM_LAYER_RENDERERS), ['flights']);
+test('flights and military have extracted Cesium renderers; the others still draw themselves', () => {
+  assert.deepEqual(Object.keys(CESIUM_LAYER_RENDERERS), [
+    'flights',
+    'military',
+  ]);
   const viewer = { scene: {}, camera: {} };
   const renderer = rendererFor('flights', { kind: 'cesium' }, { viewer });
   assert.equal(renderer.kind, 'cesium');
   assert.equal(renderer.viewer, viewer);
+  const military = rendererFor('military', { kind: 'cesium' }, { viewer });
+  assert.equal(military.kind, 'cesium');
+  assert.equal(military.viewer, viewer);
   assert.equal(rendererFor('satellites', { kind: 'cesium' }), null);
 });
 
diff --git a/src/data/militaryAwareness.test.mjs b/src/data/militaryAwareness.test.mjs
index 7abe91c1c..fe20262b6 100644
--- a/src/data/militaryAwareness.test.mjs
+++ b/src/data/militaryAwareness.test.mjs
@@ -1369,8 +1369,9 @@ test('hasContact declines while a layer is disabled, whatever its maps still hol
     // Flights asks its renderer whether the fleet is shown (phase 3).
     ['flights', readLayerSource(new URL('./flights.js', import.meta.url)),
       /hasContact\(\s*icao24,?\s*\)\s*\{\s*\n\s*if\s*\(\s*!(?:flightState\.)?_renderer\?\.fleet\.visible\(\)\s*\|\|\s*(?:flightState\.)?_billboards\.size\s*===\s*0,?\s*\)\s*return\s*null;/],
+    // Military asks its renderer too (phase 3).
     ['militaryFlights', readLayerSource(new URL('./militaryFlights.js', import.meta.url)),
-      /hasContact\(\s*icao24,?\s*\)\s*\{\s*\n\s*if\s*\(\s*!(?:flightState\.)?_billboardCollection\s*\|\|\s*!(?:flightState\.)?_billboardCollection\.show\s*\|\|\s*(?:flightState\.)?_billboards\.size\s*===\s*0,?\s*\)\s*return\s*null;/],
+      /hasContact\(\s*icao24,?\s*\)\s*\{\s*\n\s*if\s*\(\s*!(?:flightState\.)?_renderer\?\.fleet\.visible\(\)\s*\|\|\s*(?:flightState\.)?_billboards\.size\s*===\s*0,?\s*\)\s*return\s*null;/],
     ['aisLiveVessels', readLayerSource(new URL('./aisLiveVessels.js', import.meta.url)),
       /hasContact\(\s*mmsi,?\s*\)\s*\{\s*\n\s*if\s*\(\s*!state\.feed\.enabled\s*\|\|\s*!state\.records\.byMmsi\s*\|\|\s*state\.records\.byMmsi\.size\s*===\s*0,?\s*\)\s*return\s*null;/],
   ]) {
diff --git a/src/data/trackingClickGesture.test.mjs b/src/data/trackingClickGesture.test.mjs
index b71b9ba9f..c38041382 100644
--- a/src/data/trackingClickGesture.test.mjs
+++ b/src/data/trackingClickGesture.test.mjs
@@ -114,18 +114,17 @@ test('civilian and military click handlers apply duration only at the deselect b
     readLayerSource(new URL('./flights.js', import.meta.url)),
     readLayerSource(new URL('./militaryFlights.js', import.meta.url)),
   ];
-  // Military still owns its handler; flights moved to the selection
-  // dispatcher (phase 3), whose source applies the same two rules: the
-  // selection gesture before a select, the full click classifier before the
-  // empty-space deselect, which flights answers with a user-origin clear.
-  const military = sources[1];
-  assert.match(military, /isTrackingSelectionGesture\(gesture\)[\s\S]+scene\.pick/);
-  assert.match(military, /isTrackingClickGesture\(gesture\)[\s\S]+(?:parts\.\w+\.)?_clearTracking\([^)]*\{ origin: 'user' \}\)/);
+  // Flights and military moved to the selection dispatcher (phase 3), whose
+  // source applies the same two rules: the selection gesture before a
+  // select, the full click classifier before the empty-space deselect, which
+  // each layer answers with a user-origin clear.
   const dispatcher = readFileSync(new URL('./selectionDispatcher.js', import.meta.url), 'utf8');
   assert.match(dispatcher, /if \(!isTrackingSelectionGesture\(gesture\)\) return;[\s\S]+onSelect/);
   assert.match(dispatcher, /if \(!isTrackingClickGesture\(gesture\)\) return;\s*for \(const owner of \[\.\.\.owners\.values\(\)\]\) owner\.onEmptyClick/);
-  assert.match(sources[0], /dispatcher\.register\('flights', \{[\s\S]+onEmptyClick: _onEmptyClick/);
-  assert.match(sources[0], /function _onEmptyClick\(\) \{[\s\S]+?_clearTracking\(false, \{ origin: 'user' \}\)/);
+  for (const [layer, source] of [['flights', sources[0]], ['military', sources[1]]]) {
+    assert.match(source, new RegExp(`dispatcher\\.register\\('${layer}', \\{[\\s\\S]+onEmptyClick: _onEmptyClick`));
+    assert.match(source, /function _onEmptyClick\(\) \{[\s\S]+?_clearTracking\(false, \{ origin: 'user' \}\)/);
+  }
   assert.doesNotMatch(
     sources[0],
     /(?:flightState\.)?_trackedEntity = (?:flightState\.)?_viewer\.entities\.add\(\{\s*id:/,
diff --git a/src/layers/aircraft/render/cesium.js b/src/layers/aircraft/render/cesium.js
index 9bd4bf3bb..b7d5f2c0b 100644
--- a/src/layers/aircraft/render/cesium.js
+++ b/src/layers/aircraft/render/cesium.js
@@ -263,12 +263,11 @@ export function createAircraftCesiumRenderer({
      * written into the model's OWN modelMatrix: Model.modelMatrix is a plain
      * field Cesium clones per frame, so models never share one mutable
      * matrix (a shared scratch stacked every model on the last-written
-     * plane: the "flickering like mad" bug).
+     * plane: the "flickering like mad" bug). `offsetDeg`: this model's nose
+     * offset when the layer's models differ (default: the layer's).
      */
-    setPose(model, position, headingDeg) {
-      scratchHpr.heading = Cesium.Math.toRadians(
-        (headingDeg || 0) + headingOffsetDeg,
-      );
+    setPose(model, position, headingDeg, offsetDeg = headingOffsetDeg) {
+      scratchHpr.heading = Cesium.Math.toRadians((headingDeg || 0) + offsetDeg);
       scratchHpr.pitch = 0;
       scratchHpr.roll = 0;
       return Cesium.Transforms.headingPitchRollToFixedFrame(
diff --git a/src/layers/aircraft/render/cesium.test.mjs b/src/layers/aircraft/render/cesium.test.mjs
index 8de3654ae..9f3f4126b 100644
--- a/src/layers/aircraft/render/cesium.test.mjs
+++ b/src/layers/aircraft/render/cesium.test.mjs
@@ -110,6 +110,23 @@ test('a model pose is the old heading-pitch-roll frame with the nose offset', ()
   );
 });
 
+test('a model pose takes a per-model nose offset (military per-class specs)', () => {
+  const { viewer } = stubViewer();
+  const r = renderer(viewer);
+  const model = { modelMatrix: new Cesium.Matrix4() };
+  const position = geo.cartesian3.fromDegrees(-97.7, 30.2, 3000);
+  r.models.setPose(model, position, 75, 90);
+  const expected = Cesium.Transforms.headingPitchRollToFixedFrame(
+    position,
+    new Cesium.HeadingPitchRoll(Cesium.Math.toRadians(75 + 90), 0, 0),
+    Cesium.Ellipsoid.WGS84,
+  );
+  assert.deepEqual(
+    [...Cesium.Matrix4.toArray(model.modelMatrix)],
+    [...Cesium.Matrix4.toArray(expected)],
+  );
+});
+
 test('model loads carry the layer spec; the IR boost loads an UNLIT model', async () => {
   const { viewer } = stubViewer();
   const r = renderer(viewer);
diff --git a/src/layers/aircraft/render/contract.js b/src/layers/aircraft/render/contract.js
index f80d224cf..d0ce7d791 100644
--- a/src/layers/aircraft/render/contract.js
+++ b/src/layers/aircraft/render/contract.js
@@ -71,7 +71,8 @@
  *   restoreOrder(), restoreOrderOnEnable().
  * @property {object} models live(), setVisible(bool), loadFleet(spec),
  *   loadTracked(spec), preload(url) → Promise<ModelHandle>, add(model),
- *   remove(model), destroy(model), setPose(model, position, headingDeg).
+ *   remove(model), destroy(model), setPose(model, position, headingDeg,
+ *   offsetDeg?) (offsetDeg: the model's nose offset, default the layer's).
  *   spec: { url, minimumPixelSize, scale, color, blendAmount, unlit, id }.
  * @property {object} tracked create(spec) → TrackedHandle, remove(handle),
  *   isLive(handle), setImage(handle, image), setViewFrom(handle, enu),
diff --git a/src/layers/aircraft/render/navara.js b/src/layers/aircraft/render/navara.js
index 825e26725..5d77f2a76 100644
--- a/src/layers/aircraft/render/navara.js
+++ b/src/layers/aircraft/render/navara.js
@@ -719,11 +719,10 @@ export function createAircraftNavaraRenderer({
       model?.gevBank?.remove(model);
     },
     /** The same HPR frame as Cesium (modelMatrix); the instance turned by
-     *  Navara's glTF axes (NAVARA_GLTF_AXIS). */
-    setPose(model, position, headingDeg) {
-      scratchHpr.heading = geo.math.toRadians(
-        (headingDeg || 0) + headingOffsetDeg,
-      );
+     *  Navara's glTF axes (NAVARA_GLTF_AXIS). `offsetDeg`: this model's
+     *  nose offset when the layer's models differ (default: the layer's). */
+    setPose(model, position, headingDeg, offsetDeg = headingOffsetDeg) {
+      scratchHpr.heading = geo.math.toRadians((headingDeg || 0) + offsetDeg);
       geo.transforms.headingPitchRollToFixedFrame(
         position,
         scratchHpr,
diff --git a/src/layers/flights/renderer.test.mjs b/src/layers/flights/renderer.test.mjs
index 194b2ca33..32f3f4780 100644
--- a/src/layers/flights/renderer.test.mjs
+++ b/src/layers/flights/renderer.test.mjs
@@ -14,6 +14,7 @@ import * as militaryRegistry from '../../data/militaryRegistry.js';
 import { openSkySnapshot } from '../../sources/live/aircraft.js';
 import { missingAircraftRendererMembers } from '../aircraft/render/contract.js';
 import { Rgba } from '../shared/color.js';
+import { recordingAircraftRenderer as recordingRenderer } from '../../testSupport/aircraftRecordingRenderer.mjs';
 
 globalThis.window ||= {};
 globalThis.window.dispatchEvent ||= () => true;
@@ -31,123 +32,6 @@ globalThis.document ||= {
   removeEventListener() {},
 };
 
-/** A renderer of plain records, for the logic alone. */
-function recordingRenderer(engine) {
-  const calls = [];
-  const sprites = new Set();
-  const camera = {
-    positionWC: geo.cartesian3.fromDegrees(-97.7, 30.2, 400_000),
-    positionCartographic: geo.cartographic.fromDegrees(-97.7, 30.2, 400_000),
-    rightWC: geo.cartesian3.create(1, 0, 0),
-    upWC: geo.cartesian3.create(0, 0, 1),
-    directionWC: geo.cartesian3.create(0, -1, 0),
-    heading: 0,
-    pitch: -Math.PI / 2,
-    roll: 0,
-    frustum: { fovy: 1 },
-  };
-  const scene = {
-    camera,
-    canvas: { clientHeight: 768 },
-    frameState: { frameNumber: 1 },
-  };
-  let trackedSeq = 0;
-  let following;
-  const renderer = {
-    kind: 'record',
-    engine,
-    calls,
-    sprites,
-    view: {
-      camera,
-      scene,
-      surfaceOwner: engine,
-      surfaceScene: engine,
-      frameNumber: () => 1,
-      viewportHeightPx: () => 768,
-      frustumTester: () => () => true,
-      horizon: () => ({ isPointVisible: () => true }),
-      worldToWindow: () => ({ x: 0, y: 0 }),
-      requestRender: () => calls.push(['requestRender']),
-      on: () => () => {},
-      holdFrames() {},
-      closeFrameLatch() {},
-      releaseFrames() {},
-    },
-    fleet: {
-      shown: false,
-      attach: () => calls.push(['attach']),
-      detach: () => calls.push(['detach']),
-      attached: () => true,
-      visible: () => renderer.fleet.shown,
-      setVisible(visible) {
-        renderer.fleet.shown = visible;
-      },
-      add(spec) {
-        const sprite = { ...spec };
-        sprites.add(sprite);
-        return sprite;
-      },
-      remove: (sprite) => sprites.delete(sprite),
-      restoreOrder() {},
-      restoreOrderOnEnable() {},
-    },
-    models: {
-      live: () => true,
-      setVisible() {},
-      loadFleet: () => Promise.reject(new Error('no models here')),
-      loadTracked: () => Promise.reject(new Error('no models here')),
-      preload: () => Promise.reject(new Error('no models here')),
-      add() {},
-      remove() {},
-      destroy() {},
-      setPose() {},
-    },
-    tracked: {
-      create(spec) {
-        const handle = { id: `tracked-${++trackedSeq}`, spec };
-        calls.push(['tracked.create', handle.id]);
-        return handle;
-      },
-      remove: (handle) => calls.push(['tracked.remove', handle.id]),
-      isLive: () => true,
-      setImage() {},
-      setViewFrom(handle, offset) {
-        handle.viewFrom = offset;
-      },
-      billboardSize: () => null,
-    },
-    follow: {
-      start(handle) {
-        following = handle;
-        calls.push(['follow.start', handle.id]);
-        return () => calls.push(['follow.frameStop']);
-      },
-      refocus: (handle) => renderer.follow.start(handle),
-      release() {
-        following = undefined;
-        calls.push(['follow.release']);
-      },
-      isFollowing: (handle) => following === handle,
-      current: () => following,
-      onChanged: () => () => {},
-    },
-    trails: {
-      create: () => ({
-        setPositions() {},
-        setVisible() {},
-        clear() {},
-        destroy() {},
-      }),
-      createHead: ({ id }) => ({ id, show: true }),
-      removeHead() {},
-    },
-    surfaceExclusions: () => [],
-    destroy: () => calls.push(['destroy']),
-  };
-  return renderer;
-}
-
 function snapshotOf(ids) {
   const nowSec = Math.floor(Date.now() / 1000);
   return openSkySnapshot({
diff --git a/src/layers/military/lifecycle.js b/src/layers/military/lifecycle.js
index c9e658e98..5b60928ab 100644
--- a/src/layers/military/lifecycle.js
+++ b/src/layers/military/lifecycle.js
@@ -1,4 +1,3 @@
-import * as Cesium from 'cesium';
 import { JET_MODEL_URL } from './policy.js';
 
 export function createLifecycle({
@@ -9,7 +8,6 @@ export function createLifecycle({
   resolveAsset,
 }) {
   const { clearFocusTarget } = services.focus;
-  const { registerSpriteCollection, restoreSpriteOrder } = services.sprites;
   const { holdContinuousRender, releaseContinuousRender } = services.render;
   const { ensureGeoidReady } = services.geoid;
   const { registerPickOwner, unregisterPickOwner } = services.picking;
@@ -18,7 +16,7 @@ export function createLifecycle({
   const methods = {
     /** Configure the source before initialization; an active layer keeps its owner. */
     setSource(source) {
-      if (flightState._viewer)
+      if (flightState._renderer)
         throw new Error('Configure the source before layer initialization');
       if (typeof source?.getSnapshot !== 'function')
         throw new TypeError('A snapshot source is required');
@@ -29,43 +27,37 @@ export function createLifecycle({
     },
 
     /**
-     * Initialize the layer: create the billboard collection, reset all state,
-     * and install the click-to-track handler.
-     * @param {Cesium.Viewer} viewer - The Cesium viewer instance
+     * Initialize the layer: create the engine's aircraft renderer (fleet
+     * sprites, models), reset all state, and join the engine's selection
+     * dispatcher.
+     * @param {object|null} viewer - The Cesium viewer (null on an engine
+     *   without one).
+     * @param {{ engine?: object }} [context] - LayerLifecycle's context.
      */
-    init(viewer) {
-      if (flightState._viewer)
+    init(viewer, { engine = null } = {}) {
+      if (flightState._renderer)
         throw new Error('Flight layer is already initialized');
       if (typeof flightState.feed._source?.getSnapshot !== 'function')
         throw new TypeError('A snapshot source is required');
       if (flightState.lifetime.signal.aborted)
         flightState.lifetime = new AbortController();
       clearFocusTarget('militaryFlights');
-      flightState._viewer = viewer;
-      flightState._billboardCollection = new Cesium.BillboardCollection();
-      viewer.scene.primitives.add(flightState._billboardCollection);
-      registerSpriteCollection('military', flightState._billboardCollection);
-      flightState._modelCollection = new Cesium.PrimitiveCollection();
-      viewer.scene.primitives.add(flightState._modelCollection);
+      const renderer = services.renderer.create({ viewer, engine });
+      flightState._renderer = renderer;
+      renderer.fleet.attach();
       // Warm the glTF cache so the tracked plane's model instantiates instantly when first needed
       // (keeps the retained instance referenced; never rendered). Captured against this epoch so a
       // destroy/re-init mid-load doesn't flip the flag for a torn-down lifecycle.
       if (!flightState._preloadModel) {
         const epoch = flightState._modelEpoch;
-        Cesium.Model.fromGltfAsync({
-          url: resolveAsset(JET_MODEL_URL),
-          asynchronous: false,
-        })
+        renderer.models
+          .preload(resolveAsset(JET_MODEL_URL))
           .then((m) => {
             if (epoch === flightState._modelEpoch) {
               flightState._preloadModel = m;
               flightState._planeModelLoaded = true;
             } else {
-              try {
-                m.destroy();
-              } catch {
-                /* gone */
-              }
+              renderer.models.destroy(m);
             }
           })
           .catch(() => {
@@ -101,23 +93,21 @@ export function createLifecycle({
         );
       }
 
-      parts.tracking._installClickHandler(viewer);
+      parts.tracking._installClickHandler();
 
-      restoreSpriteOrder(viewer);
+      renderer.fleet.restoreOrder();
 
       console.log('[Data:Military] Initialized with billboard icons');
     },
 
     /**
-     * Show the layer and re-install the click handler.
-     * @param {Cesium.Viewer} viewer - The Cesium viewer instance
+     * Show the layer and re-join the selection dispatcher.
      */
-    enable(viewer) {
-      if (flightState._billboardCollection)
-        flightState._billboardCollection.show = true;
+    enable() {
+      const renderer = flightState._renderer;
+      renderer?.fleet.setVisible(true);
       holdContinuousRender('military'); // per-frame animator (perf wave 2)
-      if (flightState._modelCollection)
-        flightState._modelCollection.show = true;
+      renderer?.models.setVisible(true);
       parts.tracking._setCockpitContactMode(
         document.body.classList.contains('cockpit-mode'),
       );
@@ -134,7 +124,7 @@ export function createLifecycle({
             /* geoid grid failed to load — baro path stays un-geoid-corrected until retried */
           });
       }
-      parts.tracking._installClickHandler(viewer);
+      parts.tracking._installClickHandler();
       registerPickOwner('military', (pickedId) =>
         flightState._billboards.has(pickedId),
       );
@@ -142,60 +132,48 @@ export function createLifecycle({
       setMilitaryLayerActive(true);
       // Force a fresh rotation pass on the first tick after re-enable
       flightState._lastCamPoseSig = '';
-      if (!flightState._preRenderRemove && viewer?.scene) {
-        flightState._preRenderRemove = viewer.scene.preRender.addEventListener(
+      if (!flightState._preRenderRemove && renderer) {
+        flightState._preRenderRemove = renderer.view.on(
+          'preRender',
           parts.rendering._fleetTick,
         );
       }
-      if (!flightState._trackedModelPreUpdateRemove && viewer?.scene) {
-        flightState._trackedModelPreUpdateRemove =
-          viewer.scene.preUpdate.addEventListener(
-            parts.rendering._updateTrackedModel,
-          );
+      if (!flightState._trackedModelPreUpdateRemove && renderer) {
+        flightState._trackedModelPreUpdateRemove = renderer.view.on(
+          'preUpdate',
+          parts.rendering._updateTrackedModel,
+        );
       }
-      if (!flightState._moveEndRemove && viewer?.camera) {
+      if (!flightState._moveEndRemove && renderer) {
         // Arrival polish (mirror of flights.js — see the comment there): a settled
         // camera move forces a full rotation pass on the very next frame, because
         // the pose-signature gate can eat the settle (final easing frames land
         // inside one quantization bucket) and leave stale noses for up to
         // ROTATION_REFRESH_MS. One extra pass per gesture — nothing per-frame.
-        flightState._moveEndRemove = viewer.camera.moveEnd.addEventListener(
-          () => {
-            flightState._lastCamPoseSig = '';
-            flightState._lastFleetTickMs = 0;
-          },
-        );
+        flightState._moveEndRemove = renderer.view.on('moveEnd', () => {
+          flightState._lastCamPoseSig = '';
+          flightState._lastFleetTickMs = 0;
+        });
       }
-      restoreSpriteOrder(viewer);
+      renderer?.fleet.restoreOrder();
     },
 
     /**
-     * Hide the layer, clear any active tracking, and remove input handlers
-     * so clicks do not get intercepted while the layer is off.
-     * @param {Cesium.Viewer} viewer - The Cesium viewer instance
+     * Hide the layer, clear any active tracking, and leave the selection
+     * dispatcher so clicks do not get intercepted while the layer is off.
      */
-    disable(viewer) {
+    disable() {
       parts.controller._abortActiveUpdates();
       parts.tracking._cancelPendingTrackingRestore();
-      if (flightState._billboardCollection)
-        flightState._billboardCollection.show = false;
+      flightState._renderer?.fleet.setVisible(false);
       releaseContinuousRender('military');
       parts.rendering._releaseModels();
-      if (flightState._modelCollection)
-        flightState._modelCollection.show = false;
+      flightState._renderer?.models.setVisible(false);
       parts.tracking._clearTracking();
       parts.tracking._destroyTrail();
-      // Remove click handler + keydown listener while disabled to avoid
-      // intercepting input when the layer is off
-      if (flightState._clickHandler) {
-        flightState._clickHandler.destroy();
-        flightState._clickHandler = null;
-      }
-      if (flightState._trackedEntityChangedRemove) {
-        flightState._trackedEntityChangedRemove();
-        flightState._trackedEntityChangedRemove = null;
-      }
-      document.removeEventListener('keydown', parts.tracking._onKeyDown);
+      // Leave the selection dispatcher (clicks, Escape) while disabled to
+      // avoid intercepting input when the layer is off
+      parts.tracking._removeClickHandler();
       unregisterPickOwner('military');
       // Flights layer takes over rendering known-military aircraft (amber)
       setMilitaryLayerActive(false);
@@ -214,9 +192,9 @@ export function createLifecycle({
     },
 
     /**
-     * Tear down the layer: clear tracking, remove handlers, remove the billboard
-     * collection from the scene, and release all state.
-     * @param {Cesium.Viewer} viewer - The Cesium viewer instance
+     * Tear down the layer: clear tracking, remove handlers, remove its
+     * drawings, and release all state.
+     * @param {object|null} viewer - The viewer the layer was drawn on.
      */
     destroy(viewer) {
       flightState.lifetime.abort();
@@ -225,15 +203,7 @@ export function createLifecycle({
       parts.tracking._clearTracking();
       parts.tracking._destroyTrail();
       parts.tracking._cancelPendingTrackingRestore();
-      if (flightState._clickHandler) {
-        flightState._clickHandler.destroy();
-        flightState._clickHandler = null;
-      }
-      if (flightState._trackedEntityChangedRemove) {
-        flightState._trackedEntityChangedRemove();
-        flightState._trackedEntityChangedRemove = null;
-      }
-      document.removeEventListener('keydown', parts.tracking._onKeyDown);
+      parts.tracking._removeClickHandler();
       if (flightState._cockpitModeListener) {
         window.removeEventListener(
           'gev:cockpit-mode-changed',
@@ -255,23 +225,13 @@ export function createLifecycle({
         flightState._moveEndRemove = null;
       }
       parts.rendering._releaseModels();
-      if (flightState._billboardCollection) {
-        viewer.scene.primitives.remove(flightState._billboardCollection);
-        flightState._billboardCollection = null;
-      }
-      if (flightState._modelCollection) {
-        viewer.scene.primitives.remove(flightState._modelCollection); // removing destroys it + its models
-        flightState._modelCollection = null;
-      }
+      // Removing the model collection destroys it and its models.
+      flightState._renderer?.fleet.detach(viewer);
       flightState._modelEpoch += 1; // invalidate any in-flight load from this lifecycle (settles post-destroy)
       flightState._modelPending.clear();
       flightState._modelGen.clear();
       if (flightState._preloadModel) {
-        try {
-          flightState._preloadModel.destroy();
-        } catch {
-          /* gone */
-        }
+        flightState._renderer?.models.destroy(flightState._preloadModel);
         flightState._preloadModel = null;
       }
       flightState._planeModelLoaded = false;
@@ -296,7 +256,8 @@ export function createLifecycle({
         source: flightState.feed._lastSource,
       };
       parts.tracking._resetTrackedSelectionState(); // next lifecycle re-evaluates against the ENTER ceiling
-      flightState._viewer = null;
+      flightState._renderer?.destroy();
+      flightState._renderer = null;
     },
   };
 
diff --git a/src/layers/military/motion.js b/src/layers/military/motion.js
index 74ff953ed..9610cbc09 100644
--- a/src/layers/military/motion.js
+++ b/src/layers/military/motion.js
@@ -203,8 +203,9 @@ export function createMotion({
   /** Resolve the selected aircraft's actual rendered square extent this frame. */
 
   function _trackedFocusSizePx(icao24, position) {
-    const camera = flightState._viewer?.camera;
-    const scene = flightState._viewer?.scene;
+    const view = flightState._renderer?.view;
+    const camera = view?.camera;
+    const scene = view?.scene;
     if (!camera?.positionWC || !position || !scene) return 28;
     const rangeM = geo.cartesian3.distance(camera.positionWC, position);
     if (parts.rendering._modelOwnsVisual(icao24)) {
@@ -215,12 +216,12 @@ export function createMotion({
         baseScale: spec.scale,
         nativeRadiusM: spec.nativeRadiusM,
         rangeM,
-        viewportHeightPx: scene.canvas.clientHeight,
+        viewportHeightPx: view.viewportHeightPx(),
         fovyRad: camera.frustum.fovy,
         maximumPixelSize: TRACKED_MODEL_MAX_PX,
       });
       const focalLengthPx =
-        scene.canvas.clientHeight / (2 * Math.tan(camera.frustum.fovy / 2));
+        view.viewportHeightPx() / (2 * Math.tan(camera.frustum.fovy / 2));
       const projectedDiameterPx =
         (2 * spec.nativeRadiusM * scale * focalLengthPx) / rangeM;
       return Math.max(
@@ -229,17 +230,17 @@ export function createMotion({
       );
     }
 
-    const billboard = flightState._trackedEntity?.billboard;
-    const time = flightState._viewer.clock.currentTime;
-    const width = billboard?.width?.getValue(time) ?? 28;
-    const height = billboard?.height?.getValue(time) ?? 28;
+    const billboard = flightState._renderer.tracked.billboardSize(
+      flightState._trackedEntity,
+    );
+    const width = billboard?.width ?? 28;
+    const height = billboard?.height ?? 28;
     const scale =
-      billboard?.scale?.getValue(time) ??
+      billboard?.scale ??
       BILLBOARD_SCALE *
         (CLASS_SCALE_2D[flightState.records.data.get(icao24)?.klass] || 1);
     const scaleByDistance =
-      billboard?.scaleByDistance?.getValue(time) ??
-      TRACKED_BILLBOARD_SCALE_BY_DISTANCE;
+      billboard?.scaleByDistance ?? TRACKED_BILLBOARD_SCALE_BY_DISTANCE;
     const distanceScale = nearFarScalarValueAtDistance(scaleByDistance, rangeM);
     return Math.max(width, height) * scale * distanceScale;
   }
@@ -254,7 +255,7 @@ export function createMotion({
    */
 
   function _trackedDisplayPosition(icao24) {
-    const frame = flightState._viewer?.scene?.frameState?.frameNumber ?? -1;
+    const frame = flightState._renderer?.view.frameNumber() ?? -1;
     if (
       frame === flightState._cachedDRFrame &&
       icao24 === flightState._drReconcileIcao
@@ -324,8 +325,8 @@ export function createMotion({
     publishFocusTargetFromCachedPosition({
       ownerLayer: 'militaryFlights',
       id: icao24,
-      scene: flightState._viewer?.scene,
-      camera: flightState._viewer?.camera,
+      scene: flightState._renderer?.view.scene,
+      camera: flightState._renderer?.view.camera,
       displayPosition: flightState._cachedDRPosition,
       widthPx: focusSizePx,
       heightPx: focusSizePx,
diff --git a/src/layers/military/ownership.test.mjs b/src/layers/military/ownership.test.mjs
index 15ae70e44..48d7876c6 100644
--- a/src/layers/military/ownership.test.mjs
+++ b/src/layers/military/ownership.test.mjs
@@ -6,8 +6,8 @@ import { createFlightState } from './state.js';
 function services() {
   const names = [
     'picking',
-    'sprites',
-    'trails',
+    'selection',
+    'renderer',
     'aircraftPresentation',
     'camera',
     'militaryRegistry',
@@ -119,18 +119,19 @@ test('a normalized source can retain its stale reason without changing standalon
 async function firstPlacement(appClockLagMs) {
   const Cesium = await import('cesium');
   const { RENDER_DELAY_SEC } = await import('./policy.js');
+  const { createMilitaryCesiumRenderer } = await import('./render/cesium.js');
   // The application's own scene services, as src/app/layers/militaryFlights.js
   // composes them; only the surface samplers and registry are stubbed.
   const supplied = {
     picking: await import('../../data/pickRegistry.js'),
-    sprites: await import('../../data/spriteOrder.js'),
-    trails: await import('../../data/trailRenderer.js'),
-    aircraftPresentation: await import('../../data/tr3bRegistry.js'),
-    camera: {
-      ...(await import('../../data/trackedCamera.js')),
-      applyTrackedCameraFrame: (await import('../../globe/cesium/follow.js'))
-        .applyTrackedCameraFrame,
+    selection: await import('../../data/selectionDispatcher.js'),
+    // The layer's Cesium renderer, as the app creates it without an engine.
+    renderer: {
+      create: ({ viewer, adopt }) =>
+        createMilitaryCesiumRenderer(null, { viewer, adopt }),
     },
+    aircraftPresentation: await import('../../data/tr3bRegistry.js'),
+    camera: await import('../../data/trackedCamera.js'),
     labels: await import('../../data/detectionDraw.js'),
     geoid: await import('../../data/geoid.js'),
     focus: await import('../../data/focusDeemphasis.js'),
diff --git a/src/layers/military/policy.js b/src/layers/military/policy.js
index 36d5ebde4..e645513dc 100644
--- a/src/layers/military/policy.js
+++ b/src/layers/military/policy.js
@@ -5,7 +5,7 @@ export {
   MISSING_POLL_LIMIT,
   ERROR_BACKOFF_INTERVAL,
 } from './recordPolicy.js';
-import * as Cesium from 'cesium';
+import { constantRgba, nearFarScale, rgbaFromCss } from '../shared/color.js';
 
 /**
  * @module militaryFlights
@@ -32,13 +32,13 @@ import * as Cesium from 'cesium';
 
 export const BILLBOARD_SCALE = 0.7;
 
-/** @constant {Cesium.Color} Default amber tint for untracked military billboards */
+/** @constant {import('../shared/color.js').Rgba} Default amber tint for untracked military billboards */
 
-export const MIL_ICON_COLOR = Cesium.Color.fromCssColorString('#FFB800');
+export const MIL_ICON_COLOR = Object.freeze(rgbaFromCss('#FFB800'));
 
-/** @constant {Cesium.Color} Lighter amber tint applied to the actively tracked aircraft */
+/** @constant {import('../shared/color.js').Rgba} Lighter amber tint applied to the actively tracked aircraft */
 
-export const TRACKED_ICON_COLOR = Cesium.Color.fromCssColorString('#FFD166');
+export const TRACKED_ICON_COLOR = Object.freeze(rgbaFromCss('#FFD166'));
 
 // --- Ground traffic (owner reversal 2026-07-03; mirror of flights.js) ---------------
 // adsb.lol/readsb flags ground traffic with alt_baro === "ground" (no separate
@@ -149,15 +149,17 @@ export const MODEL_BELLY_OFFSET_NATIVE = 5.631;
 
 /** Amber fade target for the tracked billboard once the model takes over (mirrors flights.js CYAN_TRANSPARENT). */
 
-export const AMBER_TRANSPARENT = MIL_ICON_COLOR.withAlpha(0);
+export const AMBER_TRANSPARENT = constantRgba(
+  MIL_ICON_COLOR.red,
+  MIL_ICON_COLOR.green,
+  MIL_ICON_COLOR.blue,
+  0,
+);
 
 export const COCKPIT_CONTACT_SIZE_PX = 6;
 
-export const TRACKED_BILLBOARD_SCALE_BY_DISTANCE = new Cesium.NearFarScalar(
-  1000,
-  3.0,
-  8000000,
-  0.5,
+export const TRACKED_BILLBOARD_SCALE_BY_DISTANCE = Object.freeze(
+  nearFarScale(1000, 3.0, 8000000, 0.5),
 );
 
 // ---------------------------------------------------------------------------
diff --git a/src/layers/military/queries.js b/src/layers/military/queries.js
index bd202435f..2b03ae9f3 100644
--- a/src/layers/military/queries.js
+++ b/src/layers/military/queries.js
@@ -19,7 +19,6 @@ export function createQueries({
 }) {
   const { tr3bAircraftClass, tr3bTypeLabel } = services.aircraftPresentation;
   const { formatFlightLevel } = services.labels;
-  const { applyTrackedCameraFrame } = services.camera;
 
   /**
    * Coerce a value to a finite number, returning null if not possible.
@@ -241,7 +240,7 @@ export function createQueries({
           parts.tracking._syncTracked2dRotation();
           // Restore fleet billboards (horizon-cull re-asserts next tick), but NEVER the tracked
           // plane's own fleet billboard — its tracked entity is the visual (avoids a double-image).
-          if (flightState._billboardCollection)
+          if (flightState._renderer?.fleet.attached())
             for (const [icao, bb] of flightState._billboards) {
               if (icao !== flightState._trackedIcao) bb.show = true;
             }
@@ -324,12 +323,7 @@ export function createQueries({
      * @returns {Array<Object>} Sorted array of nearby aircraft descriptors
      */
     getNearby(center, range, maxCount = 50, { includeHidden = false } = {}) {
-      if (
-        !center ||
-        !flightState._billboardCollection ||
-        !flightState._billboardCollection.show
-      )
-        return [];
+      if (!center || !flightState._renderer?.fleet.visible()) return [];
 
       const limit = Number.isFinite(maxCount)
         ? Math.max(1, Math.floor(maxCount))
@@ -401,11 +395,7 @@ export function createQueries({
      * @returns {Array<{position: Cesium.Cartesian3, id: string, type: string, skipLabel: boolean}>}
      */
     getDetectableObjects(options = {}) {
-      if (
-        !flightState._billboardCollection ||
-        !flightState._billboardCollection.show
-      )
-        return [];
+      if (!flightState._renderer?.fleet.visible()) return [];
       const maxCount = Number.isFinite(options.maxCount)
         ? Math.max(1, Math.floor(options.maxCount))
         : flightState._billboards.size;
@@ -562,8 +552,7 @@ export function createQueries({
      */
     hasContact(icao24) {
       if (
-        !flightState._billboardCollection ||
-        !flightState._billboardCollection.show ||
+        !flightState._renderer?.fleet.visible() ||
         flightState._billboards.size === 0
       )
         return null;
@@ -577,7 +566,7 @@ export function createQueries({
 
     getAllPositions(maxCount = 500) {
       if (
-        !flightState._billboardCollection ||
+        !flightState._renderer?.fleet.attached() ||
         flightState._billboards.size === 0
       )
         return [];
@@ -624,8 +613,7 @@ export function createQueries({
      */
     getAnalystRecords(maxCount = 2000) {
       if (
-        !flightState._billboardCollection ||
-        !flightState._billboardCollection.show ||
+        !flightState._renderer?.fleet.visible() ||
         flightState.records.data.size === 0
       )
         return [];
@@ -713,7 +701,7 @@ export function createQueries({
       if (
         !icao24 ||
         flightState._cockpitContactMode ||
-        !flightState._viewer ||
+        !flightState._renderer ||
         !flightState._trackedEntity
       )
         return false;
@@ -721,19 +709,13 @@ export function createQueries({
       if (!flightState._billboards.has(id)) id = id.toLowerCase();
       if (
         id !== flightState._trackedIcao ||
-        !flightState._viewer.entities?.contains?.(flightState._trackedEntity) ||
-        flightState._viewer.trackedEntity !== flightState._trackedEntity
+        !flightState._renderer.tracked.isLive(flightState._trackedEntity) ||
+        !flightState._renderer.follow.isFollowing(flightState._trackedEntity)
       )
         return false;
       flightState._trackedCameraFrameStop?.();
-      flightState._viewer.camera.cancelFlight();
-      flightState._viewer.trackedEntity = flightState._trackedEntity;
       flightState._trackedCameraFrameStop =
-        applyTrackedCameraFrame(
-          flightState._viewer,
-          flightState._trackedEntity,
-          flightState._trackedEntity.viewFrom,
-        ) || null;
+        flightState._renderer.follow.refocus(flightState._trackedEntity);
       parts.tracking._publishTrackedSelection(id, origin);
       return true;
     },
diff --git a/src/layers/military/render/cesium.js b/src/layers/military/render/cesium.js
new file mode 100644
index 000000000..ebd3c4042
--- /dev/null
+++ b/src/layers/military/render/cesium.js
@@ -0,0 +1,24 @@
+// The military flights layer's renderer on Cesium: the shared aircraft
+// renderer (src/layers/aircraft/render/cesium.js) with the military's
+// sprite-order slot and jet.glb's nose offset (the per-class specs pass
+// their own offset to setPose). The military's presentation choices (amber
+// #FFB800 fleet, #FFD166 tracked, the IR boost as an unlit white model) are
+// the layer's logic and reach the renderer as plain data.
+
+import { createAircraftCesiumRenderer } from '../../aircraft/render/cesium.js';
+import { MODEL_HEADING_OFFSET_DEG } from '../policy.js';
+
+/**
+ * Registry factory (src/app/layers/renderers.js): `(engine, options)`.
+ * @param {object|null} engine The Cesium globe engine (null in unit tests).
+ * @param {{ viewer: object, adopt?: object }} options
+ */
+export function createMilitaryCesiumRenderer(engine, { viewer, adopt } = {}) {
+  return createAircraftCesiumRenderer({
+    viewer,
+    engine,
+    spriteLayer: 'military',
+    headingOffsetDeg: MODEL_HEADING_OFFSET_DEG,
+    adopt,
+  });
+}
diff --git a/src/layers/military/renderer.test.mjs b/src/layers/military/renderer.test.mjs
new file mode 100644
index 000000000..9e002594a
--- /dev/null
+++ b/src/layers/military/renderer.test.mjs
@@ -0,0 +1,142 @@
+// The military logic draws only through its renderer (phase 3 Task 11a): with
+// a renderer that is plain data (no Cesium), the layer builds its amber
+// fleet, selects a contact on a click through the engine's selection
+// dispatcher, tracks and follows it, and releases it on an empty click or
+// Escape. This is the seam the Navara renderer (Task 11b) plugs into.
+
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createFakeEngine } from '../../globe/testing/fakeEngine.js';
+import { createApplicationMilitary } from '../../app/layers/militaryFlights.js';
+import { defaultSurface } from '../../data/surfaceServices.js';
+import * as militaryRegistry from '../../data/militaryRegistry.js';
+import { missingAircraftRendererMembers } from '../aircraft/render/contract.js';
+import { Rgba } from '../shared/color.js';
+import { MIL_ICON_COLOR, TRACKED_ICON_COLOR } from './policy.js';
+import { recordingAircraftRenderer } from '../../testSupport/aircraftRecordingRenderer.mjs';
+
+const keyListeners = new Set();
+globalThis.window ||= {};
+globalThis.window.dispatchEvent ||= () => true;
+globalThis.window.addEventListener ||= () => {};
+globalThis.window.removeEventListener ||= () => {};
+globalThis.CustomEvent ||= class CustomEvent extends Event {
+  constructor(type, init) {
+    super(type);
+    this.detail = init?.detail;
+  }
+};
+globalThis.document ||= {
+  body: { classList: { contains: () => false } },
+  addEventListener(type, listener) {
+    if (type === 'keydown') keyListeners.add(listener);
+  },
+  removeEventListener(type, listener) {
+    if (type === 'keydown') keyListeners.delete(listener);
+  },
+};
+
+/** A military snapshot (the source's record shape) of `ids`, now. */
+function militarySnapshotOf(ids, nowMs = Date.now()) {
+  return {
+    source: 'Fixture military',
+    complete: true,
+    observedAtMs: nowMs,
+    records: ids.map((id, index) => ({
+      id,
+      callsign: `RCH${index}`,
+      latitude: 30.3,
+      longitude: -97.6 + index * 0.1,
+      onGround: false,
+      baroAltitudeM: 9_000,
+      courseDeg: 90,
+      speedMps: 200,
+      positionTimeMs: nowMs - 2_000,
+      contactTimeMs: nowMs - 2_000,
+    })),
+  };
+}
+
+const click = (engine) => {
+  engine.fake.input('down', { position: { x: 10, y: 10 } });
+  engine.fake.input('up', { position: { x: 10, y: 10 } });
+  engine.fake.input('click', { position: { x: 10, y: 10 } });
+};
+
+test('the military logic draws, selects and follows only through its renderer', async () => {
+  const engine = createFakeEngine();
+  let renderer = null;
+  const layer = createApplicationMilitary({
+    surface: defaultSurface,
+    source: {
+      label: 'Fixture military',
+      getSnapshot: async () => militarySnapshotOf(['ae0001', 'ae0002']),
+    },
+    militaryRegistry,
+    renderer: {
+      create: ({ viewer, engine: given }) => {
+        assert.equal(viewer, null, 'no viewer on an engine without one');
+        renderer = recordingAircraftRenderer(given);
+        return renderer;
+      },
+    },
+  });
+  layer.init(null, { engine });
+  assert.deepEqual(missingAircraftRendererMembers(renderer), []);
+  layer.enable();
+  try {
+    await layer.update(null);
+    assert.equal(renderer.sprites.size, 2, 'one sprite per contact');
+    const sprite = [...renderer.sprites].find(({ id }) => id === 'ae0001');
+    assert.ok(sprite.color instanceof Rgba, 'colours are engine-neutral');
+    assert.ok(sprite.color.equals(MIL_ICON_COLOR), 'the fleet is amber');
+    assert.equal(layer.getAllPositions().length, 2);
+
+    // A click on a contact: the engine's pick, through the dispatcher.
+    engine.fake.script('pick', () => ({ id: 'ae0002' }));
+    engine.fake.script('drillPick', () => [{ id: 'ae0002' }]);
+    click(engine);
+    assert.equal(layer.getTrackedInfo()?.icao24, 'ae0002');
+    const created = renderer.calls.filter(
+      ([name]) => name.startsWith('tracked') || name.startsWith('follow'),
+    );
+    assert.deepEqual(created, [
+      ['tracked.create', 'tracked-1'],
+      ['follow.start', 'tracked-1'],
+    ]);
+    // The tracked glyph is the lighter amber.
+    const trackedSpec = renderer.follow.current().spec;
+    assert.ok(trackedSpec.color().equals(TRACKED_ICON_COLOR));
+
+    // Clicking the tracked visual itself is a no-op.
+    engine.fake.script('pick', () => ({ id: 'tracked-1' }));
+    engine.fake.script('drillPick', () => [{ id: 'tracked-1' }]);
+    click(engine);
+    assert.equal(layer.getTrackedInfo()?.icao24, 'ae0002');
+
+    // Empty space releases the follow and removes the tracked visual.
+    engine.fake.script('pick', () => undefined);
+    engine.fake.script('drillPick', () => []);
+    click(engine);
+    assert.equal(layer.getTrackedInfo(), null);
+    assert.ok(
+      renderer.calls.some(([name]) => name === 'follow.release') &&
+        renderer.calls.some(
+          ([name, id]) => name === 'tracked.remove' && id === 'tracked-1',
+        ),
+    );
+
+    // Escape releases too.
+    engine.fake.script('pick', () => ({ id: 'ae0001' }));
+    engine.fake.script('drillPick', () => [{ id: 'ae0001' }]);
+    click(engine);
+    assert.equal(layer.getTrackedInfo()?.icao24, 'ae0001');
+    for (const listener of keyListeners) listener({ key: 'Escape' });
+    assert.equal(layer.getTrackedInfo(), null);
+  } finally {
+    layer.disable();
+    layer.destroy(null);
+  }
+  assert.ok(renderer.calls.some(([name]) => name === 'destroy'));
+  assert.equal(keyListeners.size, 0, 'the dispatcher left the keyboard');
+});
diff --git a/src/layers/military/rendering.js b/src/layers/military/rendering.js
index 9ebd03180..8ecb0eb9a 100644
--- a/src/layers/military/rendering.js
+++ b/src/layers/military/rendering.js
@@ -7,14 +7,14 @@ import {
   visualCenterForModel,
   trailAnchorForModel,
 } from '../../data/modelVisualAnchor.js';
-import * as Cesium from 'cesium';
+import * as geo from '../../geo/index.js';
+import { WHITE, nearFarScale } from '../shared/color.js';
 import { selectModelEligible } from '../../data/modelEligibility.js';
 import { cyberSonarBaseAlpha } from '../../cyberSonar.js';
 import { cockpitContactDotImage } from '../../data/cockpitContactDot.js';
 import { aircraftIcon, TRACKED_ICON_PX } from '../../data/aircraftIcons.js';
 import {
   cameraPoseSignature,
-  horizonOccluder,
   screenProjectedRotation,
 } from '../../data/iconOrientation.js';
 import { limitCourseStep, courseSlewCapDps } from '../../data/motionModel.js';
@@ -127,11 +127,11 @@ export function createRendering({
   function _normalBillboardScaleByDistance() {
     // Match commercial flights and preserve the established close-range 3×
     // default. Smaller owner-visible scaling must be proposed separately.
-    return new Cesium.NearFarScalar(1000, 3.0, 8000000, 0.5);
+    return nearFarScale(1000, 3.0, 8000000, 0.5);
   }
 
   function _cockpitBillboardScaleByDistance() {
-    return new Cesium.NearFarScalar(1000, 1.15, 8000000, 0.65);
+    return nearFarScale(1000, 1.15, 8000000, 0.65);
   }
 
   function _militaryBillboardScale(icao24) {
@@ -204,7 +204,8 @@ export function createRendering({
   function _modelRegimeActive() {
     if (!flightState._models3dEnabled) return false;
     const h =
-      flightState._viewer?.camera?.positionCartographic?.height ?? Infinity;
+      flightState._renderer?.view.camera?.positionCartographic?.height ??
+      Infinity;
     return h < MODEL_ALT_CEIL_M;
   }
 
@@ -235,28 +236,23 @@ export function createRendering({
       : MODEL_PROX_KEEP_M;
   }
 
-  /** World model matrix from a position + course heading (pitch/roll 0; ENU frame). Writes into
-   *  `result` and returns it — pass each model's OWN `.modelMatrix` so models never share one mutable
-   *  matrix object (see flights.js for the full rationale: sharing one scratch stacked every model on
-   *  the last-written transform, and the per-frame tracked write made it flicker). */
+  /** World model transform from a position + course heading (pitch/roll 0; ENU frame), written by
+   *  the renderer into the model's OWN transform — never a shared scratch (see the renderer's
+   *  setPose and flights.js for the full rationale: sharing one scratch stacked every model on the
+   *  last-written transform, and the per-frame tracked write made it flicker). `offsetDeg` is the
+   *  model's nose offset (its spec's headingOffsetDeg). */
 
   function _modelMatrix(
     pos,
     headingDeg,
-    result = flightState._scratchModelMtx,
+    model,
     offsetDeg = MODEL_HEADING_OFFSET_DEG,
   ) {
-    flightState._scratchModelHpr.heading = Cesium.Math.toRadians(
-      (headingDeg || 0) + offsetDeg,
-    );
-    flightState._scratchModelHpr.pitch = 0;
-    flightState._scratchModelHpr.roll = 0;
-    return Cesium.Transforms.headingPitchRollToFixedFrame(
+    return flightState._renderer.models.setPose(
+      model,
       pos,
-      flightState._scratchModelHpr,
-      Cesium.Ellipsoid.WGS84,
-      undefined,
-      result,
+      headingDeg,
+      offsetDeg,
     );
   }
 
@@ -285,23 +281,23 @@ export function createRendering({
     const meta = flightState.records.data.get(icao24);
     if (!meta || !meta.onGround) return pos;
     const h = flightState._groundSnap.heightFor(
-      flightState._viewer,
+      flightState._renderer?.view.surfaceOwner,
       icao24,
       pos,
       _groundSampleExclusions,
     );
     if (h == null) return null;
-    const carto = Cesium.Cartographic.fromCartesian(
+    const carto = geo.cartographic.fromCartesian(
       pos,
-      Cesium.Ellipsoid.WGS84,
+      geo.ellipsoid.WGS84,
       flightState._scratchGroundCarto,
     );
     carto.height = h + _modelSpec(meta.klass).bellyM;
-    return Cesium.Cartesian3.fromRadians(
+    return geo.cartesian3.fromRadians(
       carto.longitude,
       carto.latitude,
       carto.height,
-      Cesium.Ellipsoid.WGS84,
+      geo.ellipsoid.WGS84,
       result,
     );
   }
@@ -333,7 +329,7 @@ export function createRendering({
     _modelMatrix(
       displayPos,
       course,
-      model.modelMatrix,
+      model,
       _modelSpec(flightState.records.data.get(icao24)?.klass).headingOffsetDeg,
     );
     if (!model.ready) {
@@ -454,21 +450,21 @@ export function createRendering({
     // Boost state likewise — creation options bake it in.
     const specKey = _specKeyFor(flightState.records.data.get(icao24)?.klass);
     const loadIrBoost = flightState._irBoost;
+    const renderer = flightState._renderer;
     try {
       const spec = _modelSpec(flightState.records.data.get(icao24)?.klass);
-      model = await Cesium.Model.fromGltfAsync({
+      model = await renderer.models.loadFleet({
         url: resolveAsset(spec.url),
-        asynchronous: false,
         minimumPixelSize: MODEL_MIN_PX,
         scale: spec.scale,
-        color: flightState._irBoost ? Cesium.Color.WHITE : _modelColor(icao24),
-        colorBlendMode: Cesium.ColorBlendMode.MIX,
+        // Bounding radius per scale unit (an engine that keeps
+        // minimumPixelSize on the CPU reports the drawn scale with it).
+        radiusM: spec.nativeRadiusM,
+        color: flightState._irBoost ? WHITE : _modelColor(icao24),
         // near self-illuminated tint so planes read uniform near AND far; IR boost → flat UNLIT white (hot)
-        colorBlendAmount: flightState._irBoost ? 1.0 : MODEL_COLOR_BLEND_AMOUNT,
-        customShader: flightState._irBoost
-          ? flightState._IR_UNLIT_SHADER
-          : undefined,
-        id: icao24, // so scene.pick returns the icao for click-to-track
+        blendAmount: flightState._irBoost ? 1.0 : MODEL_COLOR_BLEND_AMOUNT,
+        unlit: flightState._irBoost,
+        id: icao24, // so a pick returns the icao for click-to-track
       });
     } catch {
       // asset/decode fail — stay billboard. Only touch this lifecycle's state if still current
@@ -482,11 +478,7 @@ export function createRendering({
     // A load from a PREVIOUS lifecycle (destroy→init happened mid-load) must NOT mutate the new
     // epoch's _modelPending/_modelGen or add to the new collection — just drop its model.
     if (epoch !== flightState._modelEpoch) {
-      try {
-        model.destroy();
-      } catch {
-        /* gone */
-      }
+      renderer.models.destroy(model);
       return;
     }
     flightState._modelPending.delete(icao24);
@@ -498,8 +490,7 @@ export function createRendering({
     const stale =
       (flightState._modelGen.get(icao24) || 0) !== gen ||
       !_modelRegimeActive() ||
-      !flightState._modelCollection ||
-      flightState._modelCollection.isDestroyed() ||
+      !flightState._renderer?.models.live() ||
       !flightState.records.data.has(icao24) ||
       icao24 === flightState._trackedIcao ||
       flightState._models.has(icao24) ||
@@ -509,11 +500,7 @@ export function createRendering({
       // IR boost flipped mid-load → this model baked the wrong shader/tint.
       flightState._irBoost !== loadIrBoost;
     if (stale) {
-      try {
-        model.destroy();
-      } catch {
-        /* already gone */
-      }
+      renderer.models.destroy(model);
       _cleanupModelGen(icao24); // bound the map
       return;
     }
@@ -527,7 +514,7 @@ export function createRendering({
     // between admission and the next fleet tick (and draw at the identity matrix,
     // i.e. the Earth's centre). The handoff turns it on once it has a matrix.
     model.show = false;
-    flightState._modelCollection.add(model);
+    flightState._renderer.models.add(model);
     flightState._models.set(icao24, model);
     flightState._planeModelLoaded = true; // GLB is cached now — the tracked entity's model can fade in its billboard
   }
@@ -547,16 +534,7 @@ export function createRendering({
       );
     }
     if (m) {
-      if (
-        flightState._modelCollection &&
-        !flightState._modelCollection.isDestroyed()
-      ) {
-        try {
-          flightState._modelCollection.remove(m);
-        } catch {
-          /* gone */
-        }
-      }
+      flightState._renderer?.models.remove(m);
       flightState._models.delete(icao24);
     }
     // Do NOT clear _modelPending here — the in-flight load's OWN post-await removes it. Keeping
@@ -586,17 +564,9 @@ export function createRendering({
         icao,
         (flightState._modelGen.get(icao) || 0) + 1,
       );
-    if (
-      flightState._modelCollection &&
-      !flightState._modelCollection.isDestroyed()
-    ) {
-      for (const m of flightState._models.values()) {
-        try {
-          flightState._modelCollection.remove(m);
-        } catch {
-          /* gone */
-        }
-      }
+    if (flightState._renderer?.models.live()) {
+      for (const m of flightState._models.values())
+        flightState._renderer.models.remove(m);
     }
     flightState._models.clear();
   }
@@ -607,16 +577,7 @@ export function createRendering({
     flightState._trackedModelGen++;
     flightState._trackedModelLoading = false;
     if (flightState._trackedModel) {
-      if (
-        flightState._modelCollection &&
-        !flightState._modelCollection.isDestroyed()
-      ) {
-        try {
-          flightState._modelCollection.remove(flightState._trackedModel);
-        } catch {
-          /* gone */
-        }
-      }
+      flightState._renderer?.models.remove(flightState._trackedModel);
       flightState._trackedModel = null;
     }
   }
@@ -628,8 +589,7 @@ export function createRendering({
     const active =
       flightState._trackedIcao &&
       parts.tracking._trackedModelRegimeActive() &&
-      flightState._modelCollection &&
-      !flightState._modelCollection.isDestroyed();
+      flightState._renderer?.models.live();
     if (!active) {
       if (flightState._trackedModel) flightState._trackedModel.show = false;
       return;
@@ -659,34 +619,28 @@ export function createRendering({
         flightState.records.data.get(flightState._trackedIcao)?.klass,
       );
       const trackedIrBoost = flightState._irBoost;
-      Cesium.Model.fromGltfAsync({
-        url: resolveAsset(trackedSpec.url),
-        asynchronous: false,
-        minimumPixelSize: TRACKED_MODEL_MIN_PX,
-        scale: trackedSpec.scale,
-        color: flightState._irBoost ? Cesium.Color.WHITE : TRACKED_ICON_COLOR,
-        colorBlendMode: Cesium.ColorBlendMode.MIX,
-        // near self-illuminated tint so planes read uniform near AND far; IR boost → flat UNLIT white (hot)
-        colorBlendAmount: flightState._irBoost ? 1.0 : MODEL_COLOR_BLEND_AMOUNT,
-        customShader: flightState._irBoost
-          ? flightState._IR_UNLIT_SHADER
-          : undefined,
-        // Pick id (H1): without it, clicking the very plane being tracked read as
-        // EMPTY SPACE (scene.pick → primitive with no id) → an unintended
-        // deselect. With the icao, the click handler recognizes it as ours.
-        id: flightState._trackedIcao,
-      })
+      const renderer = flightState._renderer;
+      renderer.models
+        .loadTracked({
+          url: resolveAsset(trackedSpec.url),
+          minimumPixelSize: TRACKED_MODEL_MIN_PX,
+          scale: trackedSpec.scale,
+          radiusM: trackedSpec.nativeRadiusM,
+          color: flightState._irBoost ? WHITE : TRACKED_ICON_COLOR,
+          // near self-illuminated tint so planes read uniform near AND far; IR boost → flat UNLIT white (hot)
+          blendAmount: flightState._irBoost ? 1.0 : MODEL_COLOR_BLEND_AMOUNT,
+          unlit: flightState._irBoost,
+          // Pick id (H1): without it, clicking the very plane being tracked read as
+          // EMPTY SPACE (a pick with no id) → an unintended deselect. With the
+          // icao, the click handler recognizes it as ours.
+          id: flightState._trackedIcao,
+        })
         .then((m) => {
           if (
             gen !== flightState._trackedModelGen ||
-            !flightState._modelCollection ||
-            flightState._modelCollection.isDestroyed()
+            !flightState._renderer?.models.live()
           ) {
-            try {
-              m.destroy();
-            } catch {
-              /* gone */
-            }
+            renderer.models.destroy(m);
             return;
           }
           // Class reclassified OR boost flipped mid-load (no release ran —
@@ -697,11 +651,7 @@ export function createRendering({
             ) !== trackedKey ||
             flightState._irBoost !== trackedIrBoost
           ) {
-            try {
-              m.destroy();
-            } catch {
-              /* gone */
-            }
+            renderer.models.destroy(m);
             flightState._trackedModelLoading = false;
             return;
           }
@@ -726,7 +676,7 @@ export function createRendering({
               _modelMatrix(
                 displayPos,
                 parts.motion._trackedDisplayCourse(),
-                m.modelMatrix,
+                m,
                 trackedSpec.headingOffsetDeg,
               );
             }
@@ -738,7 +688,7 @@ export function createRendering({
           flightState._trackedModelFailIcao = null;
           flightState._trackedModelFailCount = 0;
           flightState._trackedModelRetryAtMs = 0;
-          flightState._modelCollection.add(m);
+          flightState._renderer.models.add(m);
           flightState._planeModelLoaded = true;
         })
         .catch((err) => {
@@ -767,19 +717,17 @@ export function createRendering({
       _modelMatrix(
         displayPos,
         parts.motion._trackedDisplayCourse(),
-        flightState._trackedModel.modelMatrix,
+        flightState._trackedModel,
         spec.headingOffsetDeg,
       );
       if (!flightState._trackedModel.ready) return;
+      const view = flightState._renderer.view;
       flightState._trackedModel.scale = trackedModelScaleForPixelCap({
         baseScale: spec.scale,
         nativeRadiusM: spec.nativeRadiusM,
-        rangeM: Cesium.Cartesian3.distance(
-          flightState._viewer.camera.positionWC,
-          displayPos,
-        ),
-        viewportHeightPx: flightState._viewer.scene.canvas.clientHeight,
-        fovyRad: flightState._viewer.camera.frustum.fovy,
+        rangeM: geo.cartesian3.distance(view.camera.positionWC, displayPos),
+        viewportHeightPx: view.viewportHeightPx(),
+        fovyRad: view.camera.frustum.fovy,
         maximumPixelSize: TRACKED_MODEL_MAX_PX,
       });
       flightState._trackedModel.show = true;
@@ -797,14 +745,10 @@ export function createRendering({
    */
 
   function _fleetTick() {
-    if (
-      !flightState._viewer ||
-      !flightState._billboardCollection ||
-      !flightState._billboardCollection.show
-    )
-      return;
-    const scene = flightState._viewer.scene;
-    const camera = flightState._viewer.camera;
+    if (!flightState._renderer?.fleet.visible()) return;
+    const view = flightState._renderer.view;
+    const scene = view.scene;
+    const camera = view.camera;
     const nowMs = focusNowMs(Date.now());
 
     // (The tracked trail head is now the per-frame _trailHeadEntity segment — no 1 Hz
@@ -833,7 +777,7 @@ export function createRendering({
       flightState._lastRotPassMs = nowMs;
     }
 
-    const occluder = horizonOccluder(camera);
+    const occluder = view.horizon();
     const focusTarget = getFocusTarget();
 
     // 3D model regime: only when enabled AND the camera is zoomed in past the altitude ceiling.
@@ -859,11 +803,7 @@ export function createRendering({
       const addDistSq = addM * addM;
       const keepM = _modelKeepDistM();
       const keepDistSq = keepM * keepM;
-      const cull = camera.frustum.computeCullingVolume(
-        camPos,
-        camera.directionWC,
-        camera.upWC,
-      );
+      const inFrustum = view.frustumTester();
       const cand = [];
       for (const [icao, bb] of flightState._billboards) {
         if (icao === flightState._trackedIcao) continue;
@@ -874,18 +814,9 @@ export function createRendering({
         // Ground planes compete for model slots like everyone else (owner decision
         // 2026-07-03, mirror of flights.js — no air/ground distinction; grounded
         // placement is handled by the one-shot ground snap in _modelDisplayPosition).
-        const d2 = Cesium.Cartesian3.distanceSquared(camPos, bb.position);
+        const d2 = geo.cartesian3.distanceSquared(camPos, bb.position);
         if (d2 > keepDistSq) continue; // beyond keep radius → never eligible
-        Cesium.Cartesian3.clone(
-          bb.position,
-          flightState._scratchModelBS.center,
-        );
-        cand.push([
-          icao,
-          d2,
-          cull.computeVisibility(flightState._scratchModelBS) !==
-            Cesium.Intersect.OUTSIDE,
-        ]);
+        cand.push([icao, d2, inFrustum(bb.position)]);
       }
       cand.sort((a, b) => a[1] - b[1]);
       if (cand.length > cap && nowMs - flightState._lastModelCapWarnMs > 5000) {
@@ -913,7 +844,7 @@ export function createRendering({
       const dr = parts.motion._deadReckon(icao24, flightState._scratchFleetPos);
       // Gate the write — assigning Billboard.position dirties the whole
       // collection's vertex buffer, so skip sub-meter moves.
-      if (dr && Cesium.Cartesian3.distanceSquared(dr, bb.position) > 1.0) {
+      if (dr && geo.cartesian3.distanceSquared(dr, bb.position) > 1.0) {
         bb.position = dr;
       }
 
@@ -943,7 +874,7 @@ export function createRendering({
       // One sprite-owned write site composes freshness × focus × limb haze and
       // base class/ground scale × limb taper. The locked NearFarScalar remains
       // untouched and multiplicative; there is no cull or zero-alpha path.
-      const cameraDistanceM = Cesium.Cartesian3.distance(
+      const cameraDistanceM = geo.cartesian3.distance(
         camera.positionWC,
         bb.position,
       );
@@ -1047,9 +978,7 @@ export function createRendering({
               // IR boost must survive the per-tick treatment write; boosted
               // models also skip the recession fade (mirror of flights.js —
               // billboards keep their normal fade, hot MODELS stay full-strength).
-              baseColor: flightState._irBoost
-                ? Cesium.Color.WHITE
-                : _modelColor(icao24),
+              baseColor: flightState._irBoost ? WHITE : _modelColor(icao24),
               alpha: flightState._irBoost ? 1 : treatment.alpha,
             });
           },
diff --git a/src/layers/military/snapshotRenderer.js b/src/layers/military/snapshotRenderer.js
index 819286a03..235b38caf 100644
--- a/src/layers/military/snapshotRenderer.js
+++ b/src/layers/military/snapshotRenderer.js
@@ -14,7 +14,7 @@ import {
   MIL_ICON_COLOR,
 } from './policy.js';
 
-/** Apply military record changes to Cesium resources and existing follow operations. */
+/** Apply military record changes to the renderer's fleet and existing follow operations. */
 export function createMilitarySnapshotRenderer({
   flightState,
   records,
@@ -153,7 +153,7 @@ export function createMilitarySnapshotRenderer({
         // it ahead until the next fleet tick snapped it back.
         const displayed =
           motion._deadReckon(icao24, geo.cartesian3.create()) || position;
-        const bb = flightState._billboardCollection.add({
+        const bb = flightState._renderer.fleet.add({
           position: displayed,
           image: aircraftIcon(rendering._iconKind(icao24, meta.klass)),
           width: isTracked ? 24 : 20,
@@ -235,20 +235,27 @@ export function createMilitarySnapshotRenderer({
     // this layer's own billboards/models from the probe.
     {
       const viewerCarto =
-        flightState._viewer?.camera?.positionCartographic || null;
-      sampleMeshFloorCells(flightState._viewer?.scene, _floorWarmPoints, {
-        excludeObjects: [
-          ...flightState._billboards.values(),
-          ...flightState._models.values(),
-          flightState._trackedModel,
-        ].filter(Boolean),
-        viewerLat: viewerCarto
-          ? geo.math.toDegrees(viewerCarto.latitude)
-          : undefined,
-        viewerLon: viewerCarto
-          ? geo.math.toDegrees(viewerCarto.longitude)
-          : undefined,
-      });
+        flightState._renderer?.view.camera?.positionCartographic || null;
+      sampleMeshFloorCells(
+        flightState._renderer?.view.surfaceScene,
+        _floorWarmPoints,
+        {
+          excludeObjects:
+            flightState._renderer?.surfaceExclusions({
+              sprites: flightState._billboards.values(),
+              models: [
+                ...flightState._models.values(),
+                flightState._trackedModel,
+              ],
+            }) ?? [],
+          viewerLat: viewerCarto
+            ? geo.math.toDegrees(viewerCarto.latitude)
+            : undefined,
+          viewerLon: viewerCarto
+            ? geo.math.toDegrees(viewerCarto.longitude)
+            : undefined,
+        },
+      );
     }
 
     // Remove aircraft only after MISSING_POLL_LIMIT consecutive absences.
@@ -285,7 +292,7 @@ export function createMilitarySnapshotRenderer({
         tracking._clearTracking(false, { evicted: true });
       }
 
-      flightState._billboardCollection.remove(bb);
+      flightState._renderer.fleet.remove(bb);
       flightState._billboards.delete(icao24);
       rendering._releaseModel(icao24); // aged-out aircraft: drop its 3D model (no orphan / cap leak)
       records.forget(icao24);
diff --git a/src/layers/military/state.js b/src/layers/military/state.js
index 273e5a283..ceee9f833 100644
--- a/src/layers/military/state.js
+++ b/src/layers/military/state.js
@@ -1,6 +1,5 @@
 import { MilitaryFlightRecords } from './records.js';
 import { createMilitaryFeed } from './ingestion.js';
-import * as Cesium from 'cesium';
 import * as geo from '../../geo/index.js';
 
 export function createFlightState({ source, services }) {
@@ -33,11 +32,14 @@ export function createFlightState({ source, services }) {
 
   flightState._scratchGroundPos = geo.cartesian3.create();
 
-  /** @type {Cesium.PrimitiveCollection|null} */
+  /** @type {import('../aircraft/render/contract.js').AircraftRenderer|null}
+   *  The engine's aircraft renderer for this lifecycle (render/cesium.js on
+   *  Cesium): the fleet sprites, the models and their collection, the
+   *  tracked visual, the trail, the follow camera and the view reads. */
 
-  flightState._modelCollection = null;
+  flightState._renderer = null;
 
-  /** @type {Map<string, Cesium.Model>} icao24 → model */
+  /** @type {Map<string, object>} icao24 → model handle */
 
   flightState._models = new Map();
 
@@ -76,19 +78,10 @@ export function createFlightState({ source, services }) {
 
   flightState._planeModelLoaded = false;
 
-  /** @type {Cesium.Model|null} retained preload that keeps the glTF cache warm */
+  /** @type {object|null} retained preload that keeps the glTF cache warm */
 
   flightState._preloadModel = null;
 
-  flightState._scratchModelHpr = new Cesium.HeadingPitchRoll(0, 0, 0);
-
-  flightState._scratchModelMtx = geo.matrix4.create();
-
-  flightState._scratchModelBS = new Cesium.BoundingSphere(
-    geo.cartesian3.create(),
-    1.0,
-  );
-  // frustum-visibility test
   /** Last limb taper per billboard, retained across class/ground/cockpit repaints. */
 
   flightState._billboardLimbScale = new WeakMap();
@@ -97,11 +90,8 @@ export function createFlightState({ source, services }) {
   // Module-level state
   // ---------------------------------------------------------------------------
 
-  /** @type {Cesium.BillboardCollection|null} Single GPU-batched collection for all aircraft */
-
-  flightState._billboardCollection = null;
-
-  /** @type {Map<string, Cesium.Billboard>} ICAO hex -> billboard primitive */
+  /** @type {Map<string, object>} ICAO hex -> fleet sprite handle (the
+   *  renderer's single GPU-batched fleet) */
 
   flightState._billboards = new Map();
 
@@ -109,7 +99,7 @@ export function createFlightState({ source, services }) {
 
   flightState._detectionObjects = new Map();
 
-  /** @type {Map<string, Array<{timeMs: number, epochMs: number, position: Cesium.Cartesian3}>>} ICAO hex -> recent position samples for dead reckoning (timeMs: whole ms since the epoch, the app clock's unit) */
+  /** @type {Map<string, Array<{timeMs: number, epochMs: number, position: object}>>} ICAO hex -> recent position samples for dead reckoning (timeMs: whole ms since the epoch, the app clock's unit) */
 
   flightState._positionHistory = new Map();
 
@@ -122,7 +112,7 @@ export function createFlightState({ source, services }) {
 
   flightState._trackingIntentGeneration = 0;
 
-  /** @type {Cesium.Entity|null} Entity created for the tracked aircraft (camera follows this) */
+  /** @type {object|null} The renderer's tracked handle (the follow target) */
 
   flightState._trackedEntity = null;
 
@@ -130,7 +120,7 @@ export function createFlightState({ source, services }) {
 
   flightState._trackedCameraFrameStop = null;
 
-  /** @type {Cesium.Model|null} Standalone 3D model for the tracked aircraft — NOT a graphic on
+  /** @type {object|null} Standalone 3D model for the tracked aircraft — NOT a graphic on
    *  _trackedEntity, so viewer.trackedEntity's follow-camera always has a ready bounding sphere
    *  (a model graphic reports PENDING until loaded, which freezes the centering on 3D-toggle). */
 
@@ -140,13 +130,10 @@ export function createFlightState({ source, services }) {
 
   flightState._trackedModelLoading = false;
 
-  /** @type {Cesium.ScreenSpaceEventHandler|null} Click handler for selecting aircraft */
+  /** @type {(() => void)|null} Unregisters this layer from the engine's
+   *  selection dispatcher (clicks and Escape). */
 
-  flightState._clickHandler = null;
-
-  /** @type {Cesium.Viewer|null} Cached viewer reference */
-
-  flightState._viewer = null;
+  flightState._selectionRemove = null;
 
   /** Cockpit presentation switches ambient AIR contacts between near aircraft and far dots. */
 
@@ -168,7 +155,7 @@ export function createFlightState({ source, services }) {
 
   flightState._trail = null;
 
-  /** @type {Cesium.Entity|null} Per-frame head segment: last body point → live icon */
+  /** @type {object|null} Per-frame head segment: last body point → live icon */
 
   flightState._trailHeadEntity = null;
 
@@ -176,7 +163,7 @@ export function createFlightState({ source, services }) {
 
   flightState._trailHeadSeq = 0;
 
-  /** @type {Cesium.Cartesian3[]} Chronological tracked-aircraft fixes (oldest first) */
+  /** @type {object[]} Chronological tracked-aircraft fixes (oldest first) */
 
   flightState._trailPositions = [];
 
@@ -200,17 +187,17 @@ export function createFlightState({ source, services }) {
 
   flightState._lastTrackedRotation = 0;
 
-  /** @type {Cesium.Event.RemoveCallback|null} preRender listener disposer */
+  /** @type {(() => void)|null} preRender listener disposer */
 
   flightState._preRenderRemove = null;
 
   flightState._trackedModelPreUpdateRemove = null;
 
-  /** @type {Cesium.Event.RemoveCallback|null} camera.moveEnd listener disposer (arrival rotation pass) */
+  /** @type {(() => void)|null} camera.moveEnd listener disposer (arrival rotation pass) */
 
   flightState._moveEndRemove = null;
 
-  /** @type {Cesium.Event.RemoveCallback|null} trackedEntityChanged listener disposer (cross-layer untrack) */
+  /** @type {(() => void)|null} follow-change listener disposer (cross-layer untrack) */
 
   flightState._trackedEntityChangedRemove = null;
 
@@ -233,7 +220,7 @@ export function createFlightState({ source, services }) {
   flightState._trackedPosHolder = geo.cartesian3.create();
 
   // -- Per-frame dead-reckoning cache for the tracked entity --
-  /** @type {Cesium.Cartesian3|null} Cached DR position for the current render frame */
+  /** @type {object|null} Cached DR position for the current render frame */
 
   flightState._cachedDRPosition = null;
 
@@ -298,7 +285,7 @@ export function createFlightState({ source, services }) {
 
   flightState._drReconcileIcao = null;
 
-  /** @type {Cesium.Cartesian3} Scratch for the tracked model's rendered translation. */
+  /** @type {object} Scratch for the tracked model's rendered translation. */
 
   flightState._trackedVisualPos = geo.cartesian3.create();
 
@@ -328,24 +315,18 @@ export function createFlightState({ source, services }) {
   flightState._trackedModelRetryAtMs = 0;
 
   /** IR hot-target mode — mirror of flights.js: under the luminance-mapped
-   *  NVG/FLIR post-styles every model renders flat white (hottest); the dominant
-   *  amber/tracked tint restores on style exit. */
+   *  NVG/FLIR post-styles every model renders flat white (hottest) and UNLIT
+   *  (`unlit` in the model spec: material-stage tint still sun-shades, so
+   *  side-on planes read near-black under a high sun); the dominant
+   *  amber/tracked tint restores on style exit. The shader is baked at
+   *  creation (assigning it to a ready Cesium model is a silent no-op), so the
+   *  boost flips by release-and-reload. */
 
   flightState._irBoost = false;
 
-  /** Boosted models render UNLIT — mirror of flights.js (owner cockpit-FLIR
-   *  field rounds): material-stage tint still sun-shades, so side-on planes
-   *  read near-black under a high sun; UNLIT emits flat white regardless.
-   *  customShader on a READY model is a silent no-op (field-verified), so the
-   *  boost flips by release-and-reload — creation-time options carry it. */
-
-  flightState._IR_UNLIT_SHADER = new Cesium.CustomShader({
-    lightingModel: Cesium.LightingModel.UNLIT,
-  });
-
   flightState._irReloadQueue = null;
 
-  /** @type {Cesium.Cartographic} Scratch for _trailFloorPosition (per-frame safe). */
+  /** @type {object} Scratch (Cartographic) for _trailFloorPosition (per-frame safe). */
 
   flightState._scratchTrailCarto = geo.cartographic.create();
   return flightState;
diff --git a/src/layers/military/testing.js b/src/layers/military/testing.js
index 15ab14050..dbb54e0b9 100644
--- a/src/layers/military/testing.js
+++ b/src/layers/military/testing.js
@@ -36,9 +36,11 @@ export function createTesting({
     models = [],
     modelCollection = null,
   }) {
-    flightState._viewer = viewer;
-    flightState._modelCollection = modelCollection;
-    flightState._billboardCollection = billboardCollection;
+    // The production renderer over the test's viewer and (fake) collections.
+    flightState._renderer = services.renderer.create({
+      viewer,
+      adopt: { billboardCollection, modelCollection },
+    });
     flightState._billboards = new Map([[icao24, billboard]]);
     flightState._cullPositions.clear();
     flightState._models.clear();
diff --git a/src/layers/military/tracking.js b/src/layers/military/tracking.js
index 391342e3e..66cc31eb8 100644
--- a/src/layers/military/tracking.js
+++ b/src/layers/military/tracking.js
@@ -1,4 +1,5 @@
-import * as Cesium from 'cesium';
+import * as geo from '../../geo/index.js';
+import { nearFarScale } from '../shared/color.js';
 import { appClock } from '../../time/clock.js';
 import { nextCockpitNearContacts } from '../../data/cockpitAirLod.js';
 import { aircraftIcon, TRACKED_ICON_PX } from '../../data/aircraftIcons.js';
@@ -9,11 +10,6 @@ import {
 } from '../../data/iconOrientation.js';
 import { trailHeadStart } from '../../data/modelVisualAnchor.js';
 import { CLASS_SCALE_2D } from '../../data/aircraftClass.js';
-import {
-  bindTrackingClickGesture,
-  isTrackingSelectionGesture,
-  isTrackingClickGesture,
-} from '../../data/trackingClickGesture.js';
 import {
   TRACKED_MODEL_MAX_LOAD_FAILS,
   TRACKED_MODEL_RETRY_BACKOFF_MS,
@@ -44,11 +40,9 @@ export function createTracking({
   const { trackedLabelModelFromText, refreshTrackedReadout } = services.readout;
   const { floorAltitudeM, cachedGroundFloor, resolveGroundFloorCellsBounded } =
     services.groundFloor;
-  const { createTrail } = services.trails;
   const { ensureGeoidReady, geoidHeight } = services.geoid;
   const { clearFocusTarget } = services.focus;
-  const { applyTrackedCameraFrame } = services.camera;
-  const { resolvePickId, isOwnedByOtherLayer } = services.picking;
+  const { selectionDispatcherFor } = services.selection;
 
   function _emitAwarenessEvent(type, detail) {
     if (
@@ -73,7 +67,7 @@ export function createTracking({
         parts.queries._toCleanText(info.callsign) ||
         parts.queries._toCleanText(info.registration) ||
         icao24,
-      position: Cesium.Cartesian3.clone(bb.position),
+      position: geo.cartesian3.clone(bb.position),
       origin,
     });
     selectTrackedSubjectContext(_contextSubjectMetadata(icao24));
@@ -138,10 +132,8 @@ export function createTracking({
   /** Refresh the AIR-only Cockpit near band independently from model admission. */
 
   function _refreshCockpitNearContacts() {
-    if (
-      !flightState._cockpitContactMode ||
-      !flightState._viewer?.camera?.positionWC
-    ) {
+    const camera = flightState._renderer?.view.camera;
+    if (!flightState._cockpitContactMode || !camera?.positionWC) {
       if (flightState._cockpitNearContacts.size)
         flightState._cockpitNearContacts = new Set();
       return;
@@ -152,10 +144,7 @@ export function createTracking({
       if (icao24 === flightState._trackedIcao || !bb?.position) continue;
       distancesSquared.push([
         icao24,
-        Cesium.Cartesian3.distanceSquared(
-          flightState._viewer.camera.positionWC,
-          bb.position,
-        ),
+        geo.cartesian3.distanceSquared(camera.positionWC, bb.position),
       ]);
     }
     const next = nextCockpitNearContacts(
@@ -185,7 +174,7 @@ export function createTracking({
     // The collection stays visible in cockpit. Near AIR contacts retain their
     // aircraft silhouette until a ready model takes over; far contacts are pips.
     // Never bulk-destroy here: that stalls the renderer exactly as cockpit begins.
-    if (flightState._modelCollection) flightState._modelCollection.show = true;
+    flightState._renderer?.models.setVisible(true);
     flightState._trail?.setVisible(!next);
     if (flightState._trailHeadEntity) flightState._trailHeadEntity.show = !next;
     for (const [icao24, bb] of flightState._billboards)
@@ -264,14 +253,16 @@ export function createTracking({
   /** Re-image the tracked entity's billboard from the current class/conversion. */
 
   function _syncTrackedBillboardImage() {
-    if (!flightState._trackedIcao || !flightState._trackedEntity?.billboard)
-      return;
-    flightState._trackedEntity.billboard.image = aircraftIcon(
-      parts.rendering._iconKind(
-        flightState._trackedIcao,
-        flightState.records.data.get(flightState._trackedIcao)?.klass,
+    if (!flightState._trackedIcao || !flightState._trackedEntity) return;
+    flightState._renderer.tracked.setImage(
+      flightState._trackedEntity,
+      aircraftIcon(
+        parts.rendering._iconKind(
+          flightState._trackedIcao,
+          flightState.records.data.get(flightState._trackedIcao)?.klass,
+        ),
+        TRACKED_ICON_PX,
       ),
-      TRACKED_ICON_PX,
     );
   }
 
@@ -304,7 +295,7 @@ export function createTracking({
       _syncTrackedBillboardImage();
       _updateTrackedLabelModel(id);
     }
-    flightState._viewer?.scene?.requestRender?.();
+    flightState._renderer?.view.requestRender();
     return flightState._billboards.has(id) || id === flightState._trackedIcao;
   }
 
@@ -396,7 +387,7 @@ export function createTracking({
       return false;
     }
     flightState._trackedZoomLatched = trackedModelZoomActive(
-      flightState._viewer?.camera?.positionCartographic?.height,
+      flightState._renderer?.view.camera?.positionCartographic?.height,
       flightState._trackedZoomLatched,
     );
     return flightState._trackedZoomLatched;
@@ -405,13 +396,13 @@ export function createTracking({
   /** Seed the tracked billboard's 2D orientation before a 3D→2D handoff. */
 
   function _syncTracked2dRotation() {
-    if (!flightState._trackedIcao || !flightState._viewer) return;
+    if (!flightState._trackedIcao || !flightState._renderer) return;
     const pos =
       parts.motion._trackedDisplayCached() ||
       flightState._billboards.get(flightState._trackedIcao)?.position;
     if (!pos) return;
     const projected = screenProjectedRotation(
-      flightState._viewer.scene,
+      flightState._renderer.view.scene,
       pos,
       parts.motion._trackedDisplayCourse(),
       flightState._lastTrackedRotation,
@@ -432,31 +423,31 @@ export function createTracking({
    * invariant), so every position entering the TRAIL subsystem (seed, append,
    * per-frame head) goes through this instead — the visible taxi history sits
    * on the surface without touching the billboard/model machinery.
-   * @param {Cesium.Cartesian3} position - Owned position (mutated/replaced freely).
-   * @returns {Cesium.Cartesian3} The same or a lifted position.
+   * @param {object} position - Owned position (Cartesian3; mutated/replaced freely).
+   * @returns {object} The same or a lifted position.
    */
 
   function _trailFloorPosition(position) {
-    const carto = Cesium.Cartographic.fromCartesian(
+    const carto = geo.cartographic.fromCartesian(
       position,
-      Cesium.Ellipsoid.WGS84,
+      geo.ellipsoid.WGS84,
       flightState._scratchTrailCarto,
     );
     if (!carto) return position;
-    const latDeg = Cesium.Math.toDegrees(carto.latitude);
-    const lonDeg = Cesium.Math.toDegrees(carto.longitude);
+    const latDeg = geo.math.toDegrees(carto.latitude);
+    const lonDeg = geo.math.toDegrees(carto.longitude);
     const floored = floorAltitudeM(
       carto.height,
       cachedGroundFloor(latDeg, lonDeg),
     );
     if (floored == null || floored === carto.height) return position;
-    return Cesium.Cartesian3.fromDegrees(lonDeg, latDeg, floored);
+    return geo.cartesian3.fromDegrees(lonDeg, latDeg, floored);
   }
 
   /**
    * Append one fix to the tracked aircraft's trail accumulation and refresh
    * the rendered trail. Caller passes an owned (cloned) Cartesian3.
-   * @param {Cesium.Cartesian3} position - New fix position, appended at the head.
+   * @param {object} position - New fix position (Cartesian3), appended at the head.
    */
 
   function _appendTrailFix(position) {
@@ -505,12 +496,12 @@ export function createTracking({
         // fixes carry the pre-datum default height — the trail copy sits on
         // the surface instead (pure lift; airborne fixes pass through).
         flightState._trailPositions.push(
-          _trailFloorPosition(Cesium.Cartesian3.clone(fix.position)),
+          _trailFloorPosition(geo.cartesian3.clone(fix.position)),
         );
       }
     }
-    if (!flightState._trail && flightState._viewer) {
-      flightState._trail = createTrail(flightState._viewer, {
+    if (!flightState._trail && flightState._renderer) {
+      flightState._trail = flightState._renderer.trails.create({
         color: TRAIL_COLOR,
         width: 2.5,
       });
@@ -520,64 +511,58 @@ export function createTracking({
     // every frame via a CallbackProperty (Cesium updates entity-polyline positions cheaply,
     // unlike the trail primitive which fully rebuilds on setPositions). Keeps the head glued
     // to the 12 Hz icon instead of lagging ~1 s behind it.
-    if (!flightState._trailHeadEntity && flightState._viewer) {
-      flightState._trailHeadEntity = flightState._viewer.entities.add({
+    if (!flightState._trailHeadEntity && flightState._renderer) {
+      flightState._trailHeadEntity = flightState._renderer.trails.createHead({
         // 'gev-trail' namespace (round 6): claimed by trailRenderer's pick
         // owner so a click on the head segment never reads as empty space.
         id: `gev-trail:mil-head-${++flightState._trailHeadSeq}`,
         show: !flightState._cockpitContactMode,
-        polyline: {
-          positions: new Cesium.CallbackProperty(() => {
-            // Need ≥2 accumulated points: the body draws all-but-newest, so the head must
-            // start at the last DISPLAYED body point (index n−2). With a single fix that
-            // point would be the sole raw fix — ~now, AHEAD of the delayed icon — so the
-            // segment would draw IN FRONT of the plane. Likewise during warm-up the icon
-            // predates all real history, so there is no valid body point behind it.
-            if (
-              !flightState._trackedIcao ||
-              flightState._trailPositions.length < 2 ||
-              parts.motion._isTrackWarmingUp()
-            )
-              return [];
-            const head =
-              parts.motion._trackedTrailCached() ||
-              parts.motion._trackedDisplayPosition(flightState._trackedIcao);
-            if (!head) return [];
-            // body[n−2] (last displayed body point) → delayed head: runs FORWARD, never a
-            // backward/reversing segment.
-            const start =
-              flightState._trailPositions[
-                flightState._trailPositions.length - 2
-              ];
-            // Floor the head too (round 2): a grounded tracked contact's DR
-            // display height is the pre-datum default — without this the last
-            // segment dives underground while taxiing.
-            const end = _trailFloorPosition(Cesium.Cartesian3.clone(head));
-            // On a contact that has not moved this segment runs from inside the
-            // model out to its own anchor — a line through the fuselage. The END
-            // never gives, so a moving trail still terminates on the tail; the
-            // START is what slides, from nothing on a parked contact out to the
-            // whole segment once it has cleared its own envelope. Measured against
-            // the FLOORED endpoint, which is the one actually drawn.
-            // See trailHeadStart.
-            const from = trailHeadStart(
-              start,
-              end,
-              parts.motion._trackedModelCenterWorld(),
-              parts.motion._trackedModelEnvelopeM(),
-              flightState._scratchTrailHead,
-            );
-            if (!from) return [];
-            return [from, end];
-          }, false),
-          width: 2.5,
-          material: Cesium.Color.fromCssColorString(TRAIL_COLOR).withAlpha(0.9),
-          // Round 4: the head must never vanish into the mesh either (dimmed
-          // when occluded so depth still reads).
-          depthFailMaterial:
-            Cesium.Color.fromCssColorString(TRAIL_COLOR).withAlpha(0.45),
-          arcType: Cesium.ArcType.GEODESIC, // round 8: consistent with the trail body (no chords)
+        positions: () => {
+          // Need ≥2 accumulated points: the body draws all-but-newest, so the head must
+          // start at the last DISPLAYED body point (index n−2). With a single fix that
+          // point would be the sole raw fix — ~now, AHEAD of the delayed icon — so the
+          // segment would draw IN FRONT of the plane. Likewise during warm-up the icon
+          // predates all real history, so there is no valid body point behind it.
+          if (
+            !flightState._trackedIcao ||
+            flightState._trailPositions.length < 2 ||
+            parts.motion._isTrackWarmingUp()
+          )
+            return [];
+          const head =
+            parts.motion._trackedTrailCached() ||
+            parts.motion._trackedDisplayPosition(flightState._trackedIcao);
+          if (!head) return [];
+          // body[n−2] (last displayed body point) → delayed head: runs FORWARD, never a
+          // backward/reversing segment.
+          const start =
+            flightState._trailPositions[flightState._trailPositions.length - 2];
+          // Floor the head too (round 2): a grounded tracked contact's DR
+          // display height is the pre-datum default — without this the last
+          // segment dives underground while taxiing.
+          const end = _trailFloorPosition(geo.cartesian3.clone(head));
+          // On a contact that has not moved this segment runs from inside the
+          // model out to its own anchor — a line through the fuselage. The END
+          // never gives, so a moving trail still terminates on the tail; the
+          // START is what slides, from nothing on a parked contact out to the
+          // whole segment once it has cleared its own envelope. Measured against
+          // the FLOORED endpoint, which is the one actually drawn.
+          // See trailHeadStart.
+          const from = trailHeadStart(
+            start,
+            end,
+            parts.motion._trackedModelCenterWorld(),
+            parts.motion._trackedModelEnvelopeM(),
+            flightState._scratchTrailHead,
+          );
+          if (!from) return [];
+          return [from, end];
         },
+        width: 2.5,
+        // Round 4: the head must never vanish into the mesh either (dimmed
+        // when occluded so depth still reads); round 8: geodesic, consistent
+        // with the trail body (no chords).
+        color: TRAIL_COLOR,
       });
     }
     _refreshTrailDisplay();
@@ -673,7 +658,7 @@ export function createTracking({
       // sentinel (an arbitrary placeholder, never a reported altitude).
       if (altM == null) altM = lastAltM != null ? lastAltM : 50;
       lastAltM = altM;
-      older.push(Cesium.Cartesian3.fromDegrees(lon, lat, altM));
+      older.push(geo.cartesian3.fromDegrees(lon, lat, altM));
     }
 
     // Stride-thin the backfill so it plus the live fine segment fit the cap.
@@ -705,17 +690,8 @@ export function createTracking({
     flightState._trailBackfillToken += 1;
     flightState._trailPositions = [];
     if (flightState._trail) flightState._trail.clear();
-    if (
-      flightState._trailHeadEntity &&
-      flightState._viewer &&
-      !flightState._viewer.isDestroyed()
-    ) {
-      try {
-        flightState._viewer.entities.remove(flightState._trailHeadEntity);
-      } catch {
-        /* already gone */
-      }
-    }
+    if (flightState._trailHeadEntity)
+      flightState._renderer?.trails.removeHead(flightState._trailHeadEntity);
     flightState._trailHeadEntity = null;
   }
 
@@ -791,11 +767,11 @@ export function createTracking({
     // follow-camera, so tear down our state but DON'T clear viewer.trackedEntity (they own it now).
     // Releasing trackedEntity does NOT move the camera: Cesium resets the lookAt transform in
     // place, so the view stays where the follow left it and the user can immediately orbit/zoom.
-    if (flightState._viewer && !skipViewerUntrack) {
-      flightState._viewer.trackedEntity = undefined;
+    if (flightState._renderer && !skipViewerUntrack) {
+      flightState._renderer.follow.release();
     }
     if (flightState._trackedEntity) {
-      flightState._viewer.entities.remove(flightState._trackedEntity);
+      flightState._renderer.tracked.remove(flightState._trackedEntity);
       flightState._trackedEntity = null;
     }
     parts.rendering._releaseTrackedModel();
@@ -826,7 +802,7 @@ export function createTracking({
     )
       return false;
     if (
-      !flightState._billboardCollection?.show ||
+      !flightState._renderer?.fleet.visible() ||
       !flightState._billboards.has(pending.id)
     )
       return false;
@@ -874,12 +850,6 @@ export function createTracking({
     const getTrackedPosition = () =>
       parts.motion._trackedDisplayPosition(icao24) || bb.position;
 
-    // Dead-reckoning position property evaluated every render frame.
-    // isConstant = false so CesiumJS re-evaluates each frame.
-    const positionProperty = new Cesium.CallbackProperty(() => {
-      return getTrackedPosition();
-    }, false);
-
     // World-space orientation for the 3D model: nose along the course heading (ENU, pitch/roll 0).
     // Create tracked entity: a 2D billboard when zoomed out, a 3D model when zoomed in past the
     // TRACKED altitude ceiling. That handoff is DEFAULT behaviour — it does NOT wait on the
@@ -896,65 +866,56 @@ export function createTracking({
     // The tracked entity is a PURE BILLBOARD — no label or model graphic. The tracked plane's 3D
     // model is the standalone primitive driven by _updateTrackedModel(); keeping it off the entity is
     // what makes the follow-camera's bounding sphere always ready (see _trackedModel).
-    flightState._trackedEntity = flightState._viewer.entities.add({
-      position: positionProperty,
-      // Keep Cesium's EntityView in the same ENU frame as the close-range
-      // camera guard; AUTO may otherwise alternate with a velocity frame.
-      trackingReferenceFrame: Cesium.TrackingReferenceFrame.ENU,
-      billboard: {
-        image: aircraftIcon(
-          parts.rendering._iconKind(
-            flightState._trackedIcao,
-            flightState.records.data.get(flightState._trackedIcao)?.klass,
-          ),
-          TRACKED_ICON_PX,
+    // The renderer keeps Cesium's EntityView in the same ENU frame as the
+    // close-range camera guard (AUTO may otherwise alternate with a velocity frame).
+    flightState._trackedEntity = flightState._renderer.tracked.create({
+      // Dead-reckoning position, evaluated every render frame.
+      position: getTrackedPosition,
+      image: aircraftIcon(
+        parts.rendering._iconKind(
+          flightState._trackedIcao,
+          flightState.records.data.get(flightState._trackedIcao)?.klass,
         ),
-        width: 28,
-        height: 28,
-        scale:
-          BILLBOARD_SCALE *
-          (CLASS_SCALE_2D[
-            flightState.records.data.get(flightState._trackedIcao)?.klass
-          ] || 1),
-        // Solid amber when the billboard is the visual (zoomed out, 3D off, or model still loading);
-        // transparent once the STANDALONE tracked model is actually up (ready + shown).
-        color: new Cesium.CallbackProperty(
-          () =>
-            parts.rendering._modelOwnsVisual(flightState._trackedIcao)
-              ? AMBER_TRANSPARENT
-              : TRACKED_ICON_COLOR,
-          false,
-        ),
-        sizeInMeters: false,
-        scaleByDistance: new Cesium.NearFarScalar(1000, 3.0, 8000000, 0.5),
-        alignedAxis: Cesium.Cartesian3.ZERO,
-        // The tracked target must never vanish into tile geometry — tracking a
-        // taxiing plane at street level would otherwise bury the amber icon inside
-        // the runway skin exactly like the fleet ground icons (_groundDepthDistance);
-        // its shared-host tracked card is top-composited separately.
-        disableDepthTestDistance: Number.POSITIVE_INFINITY,
-        // Screen-projected rotation, evaluated per frame: exact in tracked-orbit
-        // mode where camera.heading lives in the entity's reference frame.
-        rotation: new Cesium.CallbackProperty(() => {
-          const tracked = flightState.records.data.get(
-            flightState._trackedIcao,
-          );
-          const pos = getTrackedPosition();
-          if (!tracked || !pos || !flightState._viewer)
-            return flightState._lastTrackedRotation;
-          const projected = screenProjectedRotation(
-            flightState._viewer.scene,
-            pos,
-            parts.motion._trackedDisplayCourse(),
-            flightState._lastTrackedRotation,
-          );
-          const rot = stabilizeScreenRotation(
-            flightState._lastTrackedRotation,
-            projected,
-          );
-          if (rot !== null) flightState._lastTrackedRotation = rot;
+        TRACKED_ICON_PX,
+      ),
+      width: 28,
+      height: 28,
+      scale:
+        BILLBOARD_SCALE *
+        (CLASS_SCALE_2D[
+          flightState.records.data.get(flightState._trackedIcao)?.klass
+        ] || 1),
+      // Solid amber when the billboard is the visual (zoomed out, 3D off, or model still loading);
+      // transparent once the STANDALONE tracked model is actually up (ready + shown).
+      color: () =>
+        parts.rendering._modelOwnsVisual(flightState._trackedIcao)
+          ? AMBER_TRANSPARENT
+          : TRACKED_ICON_COLOR,
+      scaleByDistance: nearFarScale(1000, 3.0, 8000000, 0.5),
+      // The tracked target must never vanish into tile geometry — tracking a
+      // taxiing plane at street level would otherwise bury the amber icon inside
+      // the runway skin exactly like the fleet ground icons (_groundDepthDistance);
+      // its shared-host tracked card is top-composited separately.
+      disableDepthTestDistance: Number.POSITIVE_INFINITY,
+      // Screen-projected rotation, evaluated per frame: exact in tracked-orbit
+      // mode where camera.heading lives in the entity's reference frame.
+      rotation: () => {
+        const tracked = flightState.records.data.get(flightState._trackedIcao);
+        const pos = getTrackedPosition();
+        if (!tracked || !pos || !flightState._renderer)
           return flightState._lastTrackedRotation;
-        }, false),
+        const projected = screenProjectedRotation(
+          flightState._renderer.view.scene,
+          pos,
+          parts.motion._trackedDisplayCourse(),
+          flightState._lastTrackedRotation,
+        );
+        const rot = stabilizeScreenRotation(
+          flightState._lastTrackedRotation,
+          projected,
+        );
+        if (rot !== null) flightState._lastTrackedRotation = rot;
+        return flightState._lastTrackedRotation;
       },
     });
     flightState._trackedEntity.gevSelectionOrigin = origin;
@@ -970,11 +931,11 @@ export function createTracking({
     // initial frame with surrounding context. (ENU: east=+X, north=+Y, up=+Z.)
     const altM = info?.altitudeFt ? info.altitudeFt * 0.3048 : 1500;
     const followRange = Math.min(Math.max(altM * 1.1 + 2500, 3000), 30000);
-    flightState._trackedEntity.viewFrom = new Cesium.Cartesian3(
-      0,
-      -followRange * 0.8,
-      followRange * 0.55,
-    );
+    flightState._renderer.tracked.setViewFrom(flightState._trackedEntity, {
+      x: 0,
+      y: -followRange * 0.8,
+      z: followRange * 0.55,
+    });
 
     // Cancel any in-progress camera flight first — otherwise Cesium won't apply the tracked
     // entity's viewFrom on the first frame, so voice-initiated tracking (which often fires
@@ -989,15 +950,11 @@ export function createTracking({
     flightState._trackedEntity.gevVisualPosition =
       parts.motion._trackedVisualCached;
     refreshTrackedReadout(flightState._trackedEntity);
-    flightState._viewer.camera.cancelFlight();
-    // Camera follows the tracked entity
-    flightState._viewer.trackedEntity = flightState._trackedEntity;
-    flightState._trackedCameraFrameStop =
-      applyTrackedCameraFrame(
-        flightState._viewer,
-        flightState._trackedEntity,
-        flightState._trackedEntity.viewFrom,
-      ) || null;
+    // Camera follows the tracked entity (the renderer cancels any flight
+    // first and applies the one exact tracked frame).
+    flightState._trackedCameraFrameStop = flightState._renderer.follow.start(
+      flightState._trackedEntity,
+    );
 
     // Track-history trail (PRD F2): seed from local history + async backfill.
     // Ground traffic draws NO trail — if the plane takes off while tracked, the
@@ -1016,125 +973,112 @@ export function createTracking({
   }
 
   /**
-   * Global keydown handler: pressing Escape clears the active aircraft tracking.
-   * @param {KeyboardEvent} e - The keyboard event
+   * Escape (through the selection dispatcher) clears the active aircraft tracking.
    */
 
-  function _onKeyDown(e) {
-    if (e.key === 'Escape' && flightState._trackedIcao) {
+  function _onEscape() {
+    if (flightState._trackedIcao) {
       _cancelPendingTrackingRestore();
       _clearTracking(false, { origin: 'user' });
     }
   }
 
   /**
-   * Install a left-click handler on the scene canvas for aircraft selection.
-   * Clicking a military billboard starts tracking that aircraft; clicking empty
-   * space or a non-military object deselects. Also attaches the Escape key
-   * listener via {@link _onKeyDown}. Idempotent -- no-ops if already installed.
-   * @param {Cesium.Viewer} viewer - The Cesium viewer instance
+   * A click the selection dispatcher hands this layer: one of its aircraft
+   * (a fleet sprite or model, or the tracked plane's own visual). The
+   * dispatcher has already applied the gesture rules (a drag selects
+   * nothing; isTrackingSelectionGesture) and the pointer claim.
+   * @param {string} id - The picked id this layer owns.
    */
 
-  function _installClickHandler(viewer) {
-    if (flightState._clickHandler) return; // already installed
+  function _onSelect(id) {
+    // Cockpit mode owns the camera and keeps the current aircraft as its
+    // first-person reference: a globe click selects nothing here.
+    if (document.body.classList.contains('cockpit-mode')) return;
+    // Clicking the tracked plane itself — its tracked visual or its
+    // standalone 3D model (pick id = its icao, H1) — is a no-op, not a
+    // deselect and not a re-track.
+    if (
+      id === flightState._trackedEntity?.id ||
+      (flightState._trackedIcao && id === flightState._trackedIcao)
+    )
+      return;
+    if (flightState._billboards.has(id)) {
+      _cancelPendingTrackingRestore();
+      _trackFlight(id, { origin: 'user' });
+    }
+  }
+
+  /**
+   * Empty space (or a pick no layer owns). The dispatcher calls this only
+   * for a clean, short click (isTrackingClickGesture): a slow stationary
+   * press may select, but cannot release existing tracking. A pick another
+   * layer owns (commercial flight, satellite, vessel, station, CCTV
+   * camera…) never reaches here.
+   */
+
+  function _onEmptyClick() {
+    if (document.body.classList.contains('cockpit-mode')) return;
+    if (flightState._trackedIcao) {
+      _cancelPendingTrackingRestore();
+      _clearTracking(false, { origin: 'user' });
+    }
+  }
+
+  /**
+   * Join the engine's selection dispatcher (clicks with picks, Escape) and
+   * watch the follow camera for another layer taking it.
+   * Idempotent -- no-ops if already joined.
+   */
+
+  function _installClickHandler() {
+    const renderer = flightState._renderer;
+    if (!renderer) return;
 
     // Cross-layer untrack (mirror of flights): if another layer grabs the follow-camera, drop our
-    // tracking without touching viewer.trackedEntity (the new owner controls it).
+    // tracking without touching the follow target (the new owner controls it).
     if (!flightState._trackedEntityChangedRemove) {
-      flightState._trackedEntityChangedRemove =
-        viewer.trackedEntityChanged.addEventListener(() => {
+      flightState._trackedEntityChangedRemove = renderer.follow.onChanged(
+        () => {
+          const current = flightState._renderer?.follow.current();
           if (
             flightState._trackedIcao &&
-            flightState._viewer &&
-            flightState._viewer.trackedEntity &&
-            flightState._viewer.trackedEntity !== flightState._trackedEntity
+            current &&
+            current !== flightState._trackedEntity
           ) {
             _clearTracking(true, {
-              origin:
-                flightState._viewer.trackedEntity?.gevSelectionOrigin ||
-                'programmatic',
+              origin: current?.gevSelectionOrigin || 'programmatic',
             });
           }
-        });
+        },
+      );
     }
 
-    flightState._clickHandler = new Cesium.ScreenSpaceEventHandler(
-      viewer.scene.canvas,
-    );
-    bindTrackingClickGesture(flightState._clickHandler, (click, gesture) => {
-      // Camera drags never select or deselect, even if they finish over a plane.
-      // Duration alone is allowed through so a stationary long press can still
-      // select/switch contacts; the destructive empty-space branch below applies
-      // the full travel + duration click classifier.
-      if (!isTrackingSelectionGesture(gesture)) return;
-      // Cockpit mode owns the camera and keeps the current aircraft as its
-      // first-person reference. Empty globe clicks are inert until the user
-      // exits with C, Escape, or the dedicated button.
-      if (document.body.classList.contains('cockpit-mode')) return;
-      const picked = viewer.scene.pick(click.position);
-
-      if (picked) {
-        // Clicking the tracked entity itself -- ignore (don't deselect)
-        if (picked.id === flightState._trackedEntity) return;
-
-        // Clicking the plane we're ALREADY tracking (its standalone 3D model or
-        // any pick carrying its icao) — same no-op as the 2D tracked-entity click
-        // above. H1: the model used to have no pick id, so this fell through to
-        // "empty space" and deselected the very plane being tracked.
-        if (flightState._trackedIcao) {
-          const rawPick =
-            typeof picked.id === 'string' ? picked.id : picked.primitive?.id;
-          if (
-            picked.primitive === flightState._trackedModel ||
-            rawPick === flightState._trackedIcao
-          )
-            return;
-        }
-
-        // BillboardCollection picks: CesiumJS may expose the billboard as
-        // picked.primitive (with .id = icao24) or directly as picked.id
-        const billboard = picked.primitive;
-        if (
-          billboard &&
-          billboard.id &&
-          flightState._billboards.has(billboard.id)
-        ) {
-          _cancelPendingTrackingRestore();
-          _trackFlight(billboard.id, { origin: 'user' });
-          return;
-        }
-        // Fallback: some CesiumJS versions surface the id string at picked.id
-        if (
-          picked.id &&
-          typeof picked.id === 'string' &&
-          flightState._billboards.has(picked.id)
-        ) {
-          _cancelPendingTrackingRestore();
-          _trackFlight(picked.id, { origin: 'user' });
-          return;
-        }
-      }
-
-      // A pick that belongs to a sibling layer (commercial flight, satellite,
-      // vessel, station, CCTV camera…) is not "empty space" — leave tracking
-      // alone and let that layer handle it. resolvePickId String()-coerces the
-      // heterogeneous pick ids (numeric NORAD ids, AIS record objects) so the
-      // registry predicates can recognize them (H2).
-      if (picked) {
-        const pickedId = resolvePickId(picked);
-        if (pickedId && isOwnedByOtherLayer('military', pickedId)) return;
-      }
-
-      // Clicked empty space -- deselect only for a clean, short click. A slow
-      // stationary press may select above, but cannot release existing tracking.
-      if (!isTrackingClickGesture(gesture)) return;
-      if (flightState._trackedIcao) {
-        _cancelPendingTrackingRestore();
-        _clearTracking(false, { origin: 'user' });
-      }
+    if (flightState._selectionRemove) return; // already joined
+    const dispatcher = selectionDispatcherFor(renderer.engine);
+    if (!dispatcher) return;
+    flightState._selectionRemove = dispatcher.register('military', {
+      // The fleet's icaos, and the tracked visual's own id: clicking it is
+      // this layer's no-op, never empty space.
+      owns: (id) =>
+        flightState._billboards.has(id) ||
+        (!!flightState._trackedEntity &&
+          id === String(flightState._trackedEntity.id)),
+      onSelect: _onSelect,
+      onEmptyClick: _onEmptyClick,
+      onEscape: _onEscape,
     });
+  }
 
-    document.addEventListener('keydown', _onKeyDown);
+  /** Leave the selection dispatcher and stop watching the follow camera. */
+
+  function _removeClickHandler() {
+    flightState._selectionRemove?.();
+    flightState._selectionRemove = null;
+    if (flightState._trackedEntityChangedRemove) {
+      flightState._trackedEntityChangedRemove();
+      flightState._trackedEntityChangedRemove = null;
+    }
   }
   return {
     _emitAwarenessEvent,
@@ -1165,7 +1109,10 @@ export function createTracking({
     _applyPendingTrackingRestore,
     _cancelPendingTrackingRestore,
     _trackFlight,
-    _onKeyDown,
+    _onEscape,
+    _onSelect,
+    _onEmptyClick,
     _installClickHandler,
+    _removeClickHandler,
   };
 }
diff --git a/src/testSupport/aircraftRecordingRenderer.mjs b/src/testSupport/aircraftRecordingRenderer.mjs
new file mode 100644
index 000000000..b4710cff2
--- /dev/null
+++ b/src/testSupport/aircraftRecordingRenderer.mjs
@@ -0,0 +1,122 @@
+// An aircraft renderer of plain records (src/layers/aircraft/render/
+// contract.js), for testing an aircraft layer's logic alone: no Cesium, no
+// Navara. `calls` logs the tracked/follow calls; `sprites` holds the fleet.
+
+import * as geo from '../geo/index.js';
+
+/** A renderer of plain records, for the logic alone. */
+export function recordingAircraftRenderer(engine) {
+  const calls = [];
+  const sprites = new Set();
+  const camera = {
+    positionWC: geo.cartesian3.fromDegrees(-97.7, 30.2, 400_000),
+    positionCartographic: geo.cartographic.fromDegrees(-97.7, 30.2, 400_000),
+    rightWC: geo.cartesian3.create(1, 0, 0),
+    upWC: geo.cartesian3.create(0, 0, 1),
+    directionWC: geo.cartesian3.create(0, -1, 0),
+    heading: 0,
+    pitch: -Math.PI / 2,
+    roll: 0,
+    frustum: { fovy: 1 },
+  };
+  const scene = {
+    camera,
+    canvas: { clientHeight: 768 },
+    frameState: { frameNumber: 1 },
+  };
+  let trackedSeq = 0;
+  let following;
+  const renderer = {
+    kind: 'record',
+    engine,
+    calls,
+    sprites,
+    view: {
+      camera,
+      scene,
+      surfaceOwner: engine,
+      surfaceScene: engine,
+      frameNumber: () => 1,
+      viewportHeightPx: () => 768,
+      frustumTester: () => () => true,
+      horizon: () => ({ isPointVisible: () => true }),
+      worldToWindow: () => ({ x: 0, y: 0 }),
+      requestRender: () => calls.push(['requestRender']),
+      on: () => () => {},
+      holdFrames() {},
+      closeFrameLatch() {},
+      releaseFrames() {},
+    },
+    fleet: {
+      shown: false,
+      attach: () => calls.push(['attach']),
+      detach: () => calls.push(['detach']),
+      attached: () => true,
+      visible: () => renderer.fleet.shown,
+      setVisible(visible) {
+        renderer.fleet.shown = visible;
+      },
+      add(spec) {
+        const sprite = { ...spec };
+        sprites.add(sprite);
+        return sprite;
+      },
+      remove: (sprite) => sprites.delete(sprite),
+      restoreOrder() {},
+      restoreOrderOnEnable() {},
+    },
+    models: {
+      live: () => true,
+      setVisible() {},
+      loadFleet: () => Promise.reject(new Error('no models here')),
+      loadTracked: () => Promise.reject(new Error('no models here')),
+      preload: () => Promise.reject(new Error('no models here')),
+      add() {},
+      remove() {},
+      destroy() {},
+      setPose() {},
+    },
+    tracked: {
+      create(spec) {
+        const handle = { id: `tracked-${++trackedSeq}`, spec };
+        calls.push(['tracked.create', handle.id]);
+        return handle;
+      },
+      remove: (handle) => calls.push(['tracked.remove', handle.id]),
+      isLive: () => true,
+      setImage() {},
+      setViewFrom(handle, offset) {
+        handle.viewFrom = offset;
+      },
+      billboardSize: () => null,
+    },
+    follow: {
+      start(handle) {
+        following = handle;
+        calls.push(['follow.start', handle.id]);
+        return () => calls.push(['follow.frameStop']);
+      },
+      refocus: (handle) => renderer.follow.start(handle),
+      release() {
+        following = undefined;
+        calls.push(['follow.release']);
+      },
+      isFollowing: (handle) => following === handle,
+      current: () => following,
+      onChanged: () => () => {},
+    },
+    trails: {
+      create: () => ({
+        setPositions() {},
+        setVisible() {},
+        clear() {},
+        destroy() {},
+      }),
+      createHead: ({ id }) => ({ id, show: true }),
+      removeHead() {},
+    },
+    surfaceExclusions: () => [],
+    destroy: () => calls.push(['destroy']),
+  };
+  return renderer;
+}