- setFrames takes a timed source (URL frames, or video tiles in
segments) on the scene clock by default or its own; frameReady fires
once each time the shown frame is drawn.
- drapeOn is 'surface' | 'objects' | 'all' plus lit; imagery.host() and
onHostChange go, and the drape rule Core derives is written out.
- ImagerySpec.fetchTile answers bytes, missing or defer on every
renderer; tileTransform, admit and canvas imagery need imageHooks, and
add() throws for them without it.
- Generic names for the default renderer's world data: worldDataToken,
the photoreal fallback route, and world terrain and imagery.
- clouds and water capabilities, with globe.setClouds and setWater.
- claimPointer takes a grab filter, asked on each down: a lease takes
only the presses it grabs, and wheel, pinch and every other press stay
with the camera and everyone else. Each event of a press goes where its
down went, per button, so a claim never takes a press under way.
- Core owns the styles: effects.defineStyle passes a GLSL (and optionally
WGSL) full-screen pass, with the shader interface written out.
- Credits are plain data ({ text, href, logoUrl, inline }) that Core
renders; CreateOptions.creditContainer goes.
- controls.coast { drag, zoom } in seconds replaces the inertia trio; the
stub's defaults are the default renderer's, converted.
- The frame order is the default renderer's own: a move made by follow or
in preUpdate reaches changed on the next frame.
- lodGroup links items across sets as one thing at different detail;
picks name the member shown and report the group. displayRange is
half-open.
- An orbits capability: the renderer propagates two-line elements with
SGP4 on the set's motion clock. The stub propagates with satellite.js.
- Height queries see draw sets only with includeInHeightQueries (was
excludeFromHeightQueries); HeightSample.source gains 'set'.
- courseGlide is a capability; courseBlendMs eases the course on every
renderer.
- Arc segments climb at climbMps; a negative minDtS stays for the
aircraft warm-up.
- The star catalogue is optional, a hidden column row keeps its motion,
and draw.clampState() reports the drape fallback.
Checks cover the climb and warm-up, lodGroup ranges, orbits against SGP4
(with and without motionSegments), hidden rows resuming, and sets not
answering height queries by default.
The renderer contract is what the application asks of a 3D renderer, so a
renderer other than Cesium can draw the same application. It is nine ports
(frame, globe, draw, camera, query, input, effects, credits, quality) plus
the renderer itself, one strict .d.ts per port in src/render/contract/.
PORTS lists every member at run time, and a TypeScript-compiler test fails
when the list and the types disagree on one member. An optional member
exists only with its capability; a required one answers null or empty
without it. Nothing in the application uses the contract yet.
The stub renderer (src/render/stub/) implements every port in memory and
draws nothing. Its camera is a port of the default camera's maths: views,
lookAt, flights with their height arc and easing, rectangle framing on the
geodesic midpoint, the view rectangle with its horizon and pole cases,
changed thresholds, follows, and flights that finish inside the call.
The conformance suite (src/render/conformance/) runs 59 checks against
any renderer through the contract alone, in Node or in a browser page. The
camera checks compare traces recorded from Cesium's own Camera, headless on
a virtual clock (scripts/record-camera-goldens.mjs), to 1 mm, 1e-9 and
1e-3 px. The other checks cover listener rules on every subscription, the
frame loop, draw sets, picks, motion clocks, heights, leases, imagery,
styles, credits and quality knobs. The stub passes all of them but the
model check, which needs a glTF asset.
Reference scenes draw one scene per primitive family, a city and a
calibration path from orbit to the street, from contract calls only and
with no network. /dev/conformance/ draws them on the Cesium scene renderer
(src/render/cesium/sceneRenderer.js), records references through a
dev-server-only, loopback-only endpoint, and compares captures with
pixelmatch's antialias detection plus a solid-pixel count. Measured on
Cesium: every MSAA setting passes, and a dropped 4 px point, a dropped 2 px
line and a 1 px shift of the view fail. visual.js states the limits.
The package exports ./render/contract, ./render/stub and
./render/conformance. Documented in docs/RENDERER-CONTRACT.md,
docs/CODE-BOUNDARIES.md and docs/CURRENT-STATE.md.
Sameh Khamis