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Stop the Google 3D basemap going black, stalling and showing a logo - #96
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Picking Google 3D at world view and flying to a city gave about five seconds of black map: the gate hid the globe the moment the camera went under 30 km, before any mesh tile had loaded. Under the keyless mesh the globe now stays visible as the backdrop. Left on under a loaded mesh it changes at most 0.01 % of pixels, so there is nothing to gain by hiding it. The licensed stream keeps hiding it, because its heights are ellipsoidal. The satellite basemap was also starving the mesh. Cesium allows one server 18 requests at a time; on a large canvas the basemap held all 18 for seconds at a stretch while the mesh had none in flight. While the mesh is up the globe runs at screen-space error 16. On a very large canvas one texel per pixel asked for more than could load: at 3162x1994, 3 140 tiles and 2.5 GB for one view, unfinished after 40 s. Above 2.5 MP the mesh's error scales with the pixel count, and the mesh skips the coarser tiles above the ones it needs. The same view loads in 16 s with 1 365 tiles; a 1920 px fly-in goes from 16 s to 6 s. Showing the mesh un-hid Cesium's credit strip, which put the Cesium ion logo half under the time dock. That strip is for the licensed stream and stays hidden for this source. docs/decisions.md records the measurements, two artefacts that are Google's own data (a colour seam in Manhattan, a blurred patch in Paris), and two changes that were tried and dropped.
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📝 WalkthroughWalkthroughThe globe canvas now applies keyless-specific screen-space error, globe visibility, and attribution behavior. Keyless mesh loading enables skipped levels of detail and initializes the mesh as hidden before insertion; licensed tile behavior remains distinct. ChangesKeyless mesh display
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to If the basemap switches from the keyless mesh to licensed Google tiles while the camera is close to the ground, the licensed tiles render without their required attribution and with the globe still drawn underneath. The view corrects itself only after zooming out past 30 km. This is a one-line fix and should be made before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Risk is concentrated in the active map session rather than credential access or service exposure. Switching from keyless to licensed tiles can leave licensed attribution hidden and the wrong globe backdrop visible until visibility changes again. Retained concerns
Security review detailsSecurity Blast Radius
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Review comments at @apps/web/src/globe/GlobeCanvas.tsx:
- Line 1173: Set tileset.show to false unconditionally before insertion, rather
than hiding only keyless tilesets; this ensures both sources enter
applyGoogleGate hidden so the gate updates globe visibility and attribution for
licensed replacements below 30 km.
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A tileset is born with show = true and the gate only acts on a change, so one created under 30 km skipped the gate's work. For the licensed stream that left the globe on under the mesh and Google's required attribution strip hidden, until the camera crossed the height gate. Only the keyless source was being started hidden; both are now. Replacing one source with the other also puts back what the dropped tileset's gate had set: globe visible at its normal detail, strip hidden. The new tileset's gate then sets its own state. googleGate.test.ts pins the two sources' opposite answers: backdrop globe and no strip for the keyless mesh, no globe and a visible strip for the licensed stream.
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What was wrong
Reproduced by doing what an operator does: pick Google 3D at world view, then fly to a city.
What changed (frontend only,
GlobeCanvas.tsx)skipLevelOfDetail).Measured
A full-resolution crop of the 4K view before and after is hard to tell apart.
Switching basemaps and crossing the 30 km gate were checked for state: globe error, anti-aliasing and credit strip return to their previous values each time.
Not bugs: Google's own data
Tried and dropped
Still slow, and not from this code
The API serves a cached tile in a median 8 ms, but its event loop was measured stalling up to 15 s (p95 0.5 to 0.85 s) while other ingest work ran in the same process. Every tile route waits behind that.
Tests
Web 897 passed; typecheck and eslint clean. Checks were run in headless Chrome on the RTX 5090, so the times above are from that harness.
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