Improve Cesium cruise smoothness
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{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
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{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
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# Smooth Cesium preview vehicle cruise
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## Goal
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Improve perceived smoothness of vehicle cruise in the Cesium preview for
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`nantaizi-lake-innovation-valley` while the scene model is visible, especially
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when Follow passes through scrub-heavy areas.
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The initial preview-layer optimization helped but did not solve the root cause:
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closing `Scene` helps a lot, and the current nantaizi GLB contains about 707
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scrub bush nodes. The root fix is allowed to reduce scrub bush instance density
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while preserving the flat scrub ground cover and existing preview controls.
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## Requirements
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1. Optimize `scripts/lib/cesium-preview.js` so vehicle animation does less
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per-frame work during cruise without reducing default visual clarity.
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2. Preserve existing controls and behavior:
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- Play/Pause still drives `viewer.clock.shouldAnimate`.
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- Speed slider still maps m/s to clock multiplier.
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- Vehicle selection still chooses the follow target.
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- Scene/routes/vehicles/FPS/diagnostics toggles still work.
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- Follow mode still tracks the selected vehicle.
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3. Keep the preview layer dependency-free and browser-native; no build step,
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npm dependency, module system, or hard-coded area filenames.
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4. Reduce scrub edge bush instance density in `blender/generate_scene.py` to
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lower Cesium render load in scrub-heavy Follow views. Preserve deterministic
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sampling, scrub ground polygons, scrub tree sampling, and scene stats fields.
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5. Regenerate or copy the updated preview JS into
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`outputs/nantaizi-lake-innovation-valley/cesium-preview.js` only if needed
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for local manual verification; do not commit generated outputs.
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6. Rebuild `nantaizi-lake-innovation-valley` `blender,cesium,preview` outputs
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for manual validation. This task intentionally changes generated GLB
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structure, so full parity-identical output is not expected.
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## Acceptance Criteria
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- [ ] `scripts/lib/cesium-preview.js` has a small, reviewable optimization that
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reduces per-frame allocations or render overhead for vehicle cruise.
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- [ ] `blender/generate_scene.py` reduces nantaizi scrub bush node count by at
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least 50% while keeping scrub polygons present.
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- [ ] Vehicle controls listed in Requirements continue to work by inspection
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and/or local smoke check.
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- [ ] Blender/Cesium rebuild for `nantaizi-lake-innovation-valley` completes
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and generated metadata still includes scrub counts.
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- [ ] `node --check scripts/lib/cesium-preview.js` passes.
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- [ ] `python3 -m py_compile blender/generate_scene.py` passes.
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- [ ] If local output preview JS is updated for testing, it remains ignored and
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is not committed.
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## Out Of Scope
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- Full scene geometry/material optimization beyond scrub edge bush density.
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- Reducing tree count or changing road/building/water assets.
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- Replacing Cesium or adding profiling libraries.
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- Visual design changes to the preview UI.
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## Technical Notes
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- User confirmed closing `Scene` improves smoothness, so the scene render load
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is a real contributor.
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- Current route data is small: `nantaizi-lake-innovation-valley` has 9 route
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segments and the preview uses at most 5 vehicles.
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- Current nantaizi GLB has 1271 nodes; about 707 are scrub bush nodes. Lowering
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scrub edge sampling from `0.82m / 180 per patch` to `1.8m / 60 per patch`
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should reduce nantaizi bush samples to about 266 while leaving scrub ground
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cover intact.
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# Smooth Cesium preview vehicle cruise report
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## Root Cause
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The first preview-only optimization helped but did not address the main load.
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User testing showed Follow still stuttered in scrub-heavy areas, while disabling
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`Scene` improved smoothness substantially.
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Current nantaizi GLB before the scrub-density change:
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- GLB nodes: `1271`
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- Scrub bush nodes: `707`
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- Scrub polygons: `5`
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The route data is small (`9` route segments, preview uses at most `5` vehicles),
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so route interpolation is not the primary bottleneck.
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## Changes
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- `scripts/lib/cesium-preview.js`
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- Route helper polyline is now opaque instead of alpha blended.
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- Route helper polyline uses `arcType: Cesium.ArcType.NONE`.
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- Vehicle orientation and chase-follow camera callbacks reuse scratch
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`JulianDate`, `HeadingPitchRoll`, `Quaternion`, and `Matrix4` objects.
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- Default Cesium resolution and antialiasing are preserved; no blurry
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performance mode is enabled by default.
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- `blender/generate_scene.py`
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- `SCRUB_BUSH_SPACING`: `0.82 -> 1.8`
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- `SCRUB_BUSH_LIMIT_PER_PATCH`: `180 -> 60`
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- Scrub ground cover remains unchanged.
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## Validation
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Commands run:
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```bash
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node --check scripts/lib/cesium-preview.js
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python3 -m py_compile blender/generate_scene.py
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python3 -m unittest blender/tests/test_pure.py
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npm run build:area -- --config config/areas/nantaizi-lake-innovation-valley.json --stages blender,cesium,preview
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node scripts/glb-digest.js outputs/nantaizi-lake-innovation-valley/nantaizi-lake-innovation-valley.glb --out /tmp/nantaizi-after-scrub-glb-digest.json
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```
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Results after rebuild:
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- `SCENE_DONE` reports `scrub_bushes: 266`.
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- GLB nodes: `830`
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- Scrub bush nodes: `266`
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- Scrub polygons in metadata: `5`
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- Route segments in preview route JSON: `9`
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- GLB size: about `31.96 MB`
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## Deferred
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If Follow still stutters after this density reduction, the next root-level work
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should target the bush asset itself: lower-poly bush mesh, explicit LOD, or a
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proper instancing path supported by Cesium/glTF.
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@@ -0,0 +1,26 @@
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{
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"id": "smooth-cesium-preview-vehicle-cruise",
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"name": "smooth-cesium-preview-vehicle-cruise",
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"title": "Smooth Cesium preview vehicle cruise",
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"description": "Optimize Cesium preview vehicle cruise smoothness without changing Blender or GLB output.",
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"status": "in_progress",
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"dev_type": null,
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"scope": null,
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"package": null,
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"priority": "P2",
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"creator": "dingkang",
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"assignee": "dingkang",
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"createdAt": "2026-08-03",
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"completedAt": null,
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"branch": null,
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"base_branch": "main",
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"worktree_path": null,
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"commit": null,
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"pr_url": null,
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"subtasks": [],
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"children": [],
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"parent": null,
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"relatedFiles": [],
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"notes": "",
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"meta": {}
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}
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