diff --git a/scripts/qa-floor-verify.mjs b/scripts/qa-floor-verify.mjs
index 97b1483dd..756f4cfe3 100644
--- a/scripts/qa-floor-verify.mjs
+++ b/scripts/qa-floor-verify.mjs
@@ -10,7 +10,12 @@ import fs from 'node:fs';
 
 // QA_BASE_URL matches the sibling harnesses (qa-height-datum / qa-cctv-v2) so a
 // secondary checkout can verify against its own dev server instead of the default :4173.
-const APP_URL = process.env.QA_BASE_URL || 'http://localhost:4173';
+const BASE_URL = process.env.QA_BASE_URL || 'http://localhost:4173';
+// --engine=cesium|navara (phase 3): on Navara the camera, the mesh probes and
+// the sprite census go through the engine and the QA probe.
+const ENGINE = (process.argv.find((arg) => arg.startsWith('--engine=')) ?? '--engine=cesium').slice(9);
+const APP_URL =
+  ENGINE === 'cesium' ? BASE_URL : `${BASE_URL.replace(/\/$/, '')}/?engine=${ENGINE}`;
 // CLI: --lat --lon --floor-min --floor-max (defaults: Austin airport)
 const argv = Object.fromEntries(process.argv.slice(2).map((a) => a.split('=')).filter((x) => x.length === 2).map(([k, v]) => [k.replace(/^--/, ''), Number(v)]));
 const SITE = {
@@ -38,7 +43,7 @@ const page = await browser.newPage();
 await page.setViewport({ width: 1400, height: 900 });
 page.on('pageerror', (e) => console.log('[pageerror]', e.message));
 await page.goto(APP_URL, { waitUntil: 'domcontentloaded', timeout: 120000 });
-await page.waitForFunction(() => window.__godsEyeView?.dataManager && window.__godsEyeView?.viewer, { timeout: 150000 });
+await page.waitForFunction(() => window.__godsEyeView?.dataManager && window.__godsEyeView?.engine, { timeout: 150000 });
 await sleep(2000);
 
 // Let the app's boot fly-to fully settle FIRST (it was overriding an early
@@ -46,8 +51,16 @@ await sleep(2000);
 // coarse global tiles at ~25 m and the oracle was garbage).
 await sleep(12000);
 await page.evaluate((site) => { window.__QA_SITE = site; }, SITE);
-const camPin = async () => page.evaluate(() => {
+const camPin = async () => page.evaluate(async () => {
   const v = window.__godsEyeView.viewer;
+  if (!v) {
+    const geo = await import('/src/geo/index.js');
+    const { camera } = window.__godsEyeView.engine;
+    camera.cancelFlight();
+    camera.setView({ destination: geo.cartesian3.fromDegrees(window.__QA_SITE.lon, window.__QA_SITE.lat, 3000) });
+    const c = camera.pose().cartographic;
+    return { lat: +(c.latitude * 180 / Math.PI).toFixed(3), lon: +(c.longitude * 180 / Math.PI).toFixed(3), h: Math.round(c.height) };
+  }
   const C = v.camera.positionCartographic.constructor;
   v.camera.cancelFlight();
   v.camera.setView({ destination: v.scene.globe.ellipsoid.cartographicToCartesian(C.fromDegrees(window.__QA_SITE.lon, window.__QA_SITE.lat, 3000)) });
@@ -63,6 +76,7 @@ await sleep(100000);
 console.log('camera at probe time:', JSON.stringify(await camPin()));
 const ready = await page.evaluate(() => {
   const v = window.__godsEyeView.viewer;
+  if (!v) return { tilesLoaded: window.__godsEyeView.engine.surface.tilesLoaded() };
   const prims = v.scene.primitives;
   for (let i = 0; i < prims.length; i++) {
     const p = prims.get(i);
@@ -73,11 +87,44 @@ const ready = await page.evaluate(() => {
 console.log('tileset ready:', JSON.stringify(ready));
 await sleep(8000);
 
-const report = await page.evaluate(() => {
+const report = await page.evaluate(async () => {
   const gev = window.__godsEyeView;
   const v = gev.viewer;
   const layer = gev.dataManager.layers.get('flights')?.module;
   if (!layer) return { err: 'no flights module' };
+  if (!v) {
+    // The engine path: mesh probes through engine.surface, excluding the
+    // layer's own mover sets; the census from the probe's drawn().
+    const geo = await import('/src/geo/index.js');
+    const { engine } = gev;
+    const center = geo.cartesian3.fromDegrees(window.__QA_SITE.lon, window.__QA_SITE.lat, 200);
+    const nearby = layer.getNearby(center, 15000, 60);
+    const exclude = engine.movers.list().map(({ id }) => id).filter((id) => id.startsWith('flights'));
+    const out = [];
+    for (const p of nearby) {
+      const c = geo.cartographic.fromCartesian(p.position);
+      const answer = engine.surface.sampleHeightDetailed(
+        geo.cartographic.fromRadians(c.longitude, c.latitude, 0),
+        { exclude },
+      );
+      const meshH = answer?.source === 'tiles' && Number.isFinite(answer.height) ? answer.height : null;
+      out.push({
+        id: p.id,
+        renderAltM: +c.height.toFixed(1),
+        meshM: meshH != null ? +meshH.toFixed(1) : null,
+        aboveMeshM: meshH != null ? +(c.height - meshH).toFixed(1) : null,
+      });
+    }
+    let shown = 0, hidden = 0;
+    for (const row of gev.layers.drawn('flights') ?? []) {
+      if (!row.position) continue;
+      const cc = geo.cartographic.fromCartesian(row.position);
+      const la = cc.latitude * 180 / Math.PI, lo = cc.longitude * 180 / Math.PI;
+      if (Math.abs(la - window.__QA_SITE.lat) > 0.08 || Math.abs(lo - window.__QA_SITE.lon) > 0.10) continue;
+      if (row.show) shown++; else hidden++;
+    }
+    return { ausContacts: out.length, contacts: out.slice(0, 16), spritesShown: shown, spritesHidden: hidden };
+  }
   const ell = v.scene.globe.ellipsoid;
   const C = v.camera.positionCartographic.constructor;
   const center = ell.cartographicToCartesian(C.fromDegrees(window.__QA_SITE.lon, window.__QA_SITE.lat, 200));