Read the agent world packet's camera through src/geo

The world packet converts the eye position with toLonLatH instead of
Cesium's Cartographic, so the agent-world-packet group no longer needs
cesium. Degree conversions use precomputed factors, as Cesium.Math does,
so results stay bit for bit the same.

scripts/package-boundaries.json

@@ -2355,6 +2355,10 @@
       "./standalone/catalog"
     ],
     "modules": [
+      "src/geo/index.js",
+      "src/geo/vector.js",
+      "src/geo/ellipsoid.js",
+      "src/geo/frames.js",
       "src/layers/flights/icons.js",
       "src/data/aircraftIconLayer.js",
       "src/data/aircraftModelLayer.js",
@@ -5112,6 +5116,10 @@
   "agent-world-packet": {
     "exports": ["./agent/world-packet"],
     "modules": [
+      "src/geo/index.js",
+      "src/geo/vector.js",
+      "src/geo/ellipsoid.js",
+      "src/geo/frames.js",
       "src/agent/worldPacket.js",
       "src/data/layerSnapshot.js",
       "src/data/feedState.js",
@@ -5120,7 +5128,7 @@
       "src/data/installationFeedback.js",
       "src/i18n/marker.js"
     ],
-    "external": ["cesium"]
+    "external": []
   },
   "heights": {
     "exports": ["./queries/heights"],

src/agent/worldPacket.js

@@ -1,4 +1,4 @@
-import * as Cesium from 'cesium';
+import { toLonLatH } from '../geo/index.js';
 import {
   feedProvenanceEnvelope,
   layerSnapshot,
@@ -109,9 +109,7 @@ export function getWorldPacket(options = {}) {
   if (!dataManager || typeof dataManager.getAll !== 'function')
     throw new TypeError('World Packet requires a data manager');
 
-  const cartographic = Cesium.Cartographic.fromCartesian(
-    viewer.camera.positionWC,
-  );
+  const eye = toLonLatH(viewer.camera.positionWC);
   // Read the roster once. Voice must not rewalk disabled layers: preserving the
   // current enabled-only view keeps the model's context budget bounded.
   const rows = dataManager.getAll();
@@ -126,9 +124,9 @@ export function getWorldPacket(options = {}) {
     ok: true,
     action: 'get_current_view_state',
     camera: {
-      latitude: Cesium.Math.toDegrees(cartographic.latitude),
-      longitude: Cesium.Math.toDegrees(cartographic.longitude),
-      heightM: cartographic.height,
+      latitude: eye.lat,
+      longitude: eye.lon,
+      heightM: eye.height,
     },
     style: styleManager?.activeStyle || 'normal',
     context: contextState

src/geo/geo.test.mjs

@@ -7,7 +7,9 @@ import {
   geodeticSurfaceNormal,
   scaleToGeodeticSurface,
   toCartographicRadians,
+  toDegrees,
   toLonLatH,
+  toRadians,
 } from './index.js';
 
 /** A seeded generator, so a failure names a reproducible point. */
@@ -47,6 +49,13 @@ const closeVec = (a, b, tolerance, message) => {
   close(a.z, b.z, tolerance, `${message} z`);
 };
 
+test("angle conversions are bit for bit the default renderer's", () => {
+  for (const p of points()) {
+    assert.equal(toRadians(p.lon), Cesium.Math.toRadians(p.lon));
+    assert.equal(toDegrees(p.lat / 57), Cesium.Math.toDegrees(p.lat / 57));
+  }
+});
+
 test('geodetic to ECEF matches the default renderer', () => {
   for (const p of points()) {
     const ours = fromDegrees(p.lon, p.lat, p.height);

src/geo/vector.js

@@ -24,8 +24,12 @@ export function normalize(a) {
   return vec(a.x / m, a.y / m, a.z / m);
 }
 
-export const toRadians = (degrees) => (degrees * Math.PI) / 180;
-export const toDegrees = (radians) => (radians * 180) / Math.PI;
+// As the default renderer converts: by a precomputed factor, so results are
+// bit for bit its own.
+export const RADIANS_PER_DEGREE = Math.PI / 180;
+export const DEGREES_PER_RADIAN = 180 / Math.PI;
+export const toRadians = (degrees) => degrees * RADIANS_PER_DEGREE;
+export const toDegrees = (radians) => radians * DEGREES_PER_RADIAN;
 export const clamp = (v, lo, hi) => Math.min(hi, Math.max(lo, v));
 export const acosClamped = (v) => Math.acos(clamp(v, -1, 1));
 export const equalsEpsilon = (a, b, eps) => Math.abs(a - b) <= eps;