fix(camera): invalidate projection cache on fov/near/far change by RaananW · Pull Request #357 · BabylonJS/Babylon-Lite

RaananW · 2026-07-02T19:00:02Z

Fixes #271.

Problem

Changing camera.fov, camera.nearPlane, or camera.farPlane at runtime did not update the rendered projection until the camera moved or the aspect ratio changed.

getProjectionMatrix() cached the matrix keyed on worldMatrixVersion + aspect. But the perspective projection depends only on (fov, aspect, nearPlane, farPlane) — never on the world matrix. Mutating the public projection fields left worldMatrixVersion unchanged, so the stale cached matrix was reused. Moving the camera bumped worldMatrixVersion, which is why the change 'became visible after moving.'

Fix

getProjectionMatrix now keys the cache on its real inputs: fov, aspect, nearPlane, farPlane.
getViewProjectionMatrix keeps the view key (worldMatrixVersion) and additionally tracks the projection inputs.
updateShadowCameraBase injects a custom light-space vp matrix directly, so it now also seeds the new vp cache-key fields to keep that injection valid.

No public API change — camera.fov = … now takes effect on the next frame.

Repro / verification

Added a playground example 'Camera — FOV cache invalidation (#271)' that pulses camera.fov every frame on a static camera whose worldMatrixVersion never changes. Before the fix the scene was frozen at the initial FOV; with the fix the cubes visibly breathe in/out.

Testing

pnpm run lint — clean.
pnpm build:bundle-scenes — manifests regenerated/committed; largest delta ~+0.2 KB raw, all within ceilings.
bundle-size spec — 204 passed.
pnpm test:parity — 418 passed, 2 failed (scene116, scene144). Both reproduce byte-identically on master (verified by stashing the change), so pre-existing and unrelated.

getProjectionMatrix cached by worldMatrixVersion + aspect, but the projection matrix depends only on (fov, aspect, nearPlane, farPlane) and never on the world matrix. Mutating the public fov/nearPlane/farPlane fields left worldMatrixVersion unchanged, so the stale cached matrix was reused until the camera moved or the aspect ratio changed (#271). Key the projection cache on its real inputs (fov/aspect/near/far) and extend the view-projection cache key with the same projection inputs so runtime changes take effect on the next frame. The shadow camera facade injects a custom light-space vp matrix directly, so updateShadowCameraBase now also seeds the new vp cache-key fields to keep that injection valid. Adds a playground example (camera-fov-invalidation) that pulses fov on a static camera as a live repro/verification. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Fixes a core camera caching bug where runtime updates to camera.fov, camera.nearPlane, or camera.farPlane were not reflected until the camera moved or the aspect ratio changed, by keying the projection/view-projection caches on the actual projection inputs.

Changes:

Reworked getProjectionMatrix and getViewProjectionMatrix caching to invalidate on (fov, aspect, nearPlane, farPlane) changes (instead of worldMatrixVersion for projection).
Updated shadow-camera cache seeding so injected light-space view-projection matrices remain valid under the new cache keying.
Added a playground repro example and regenerated per-scene bundle manifests.

Reviewed changes

Copilot reviewed 201 out of 201 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
playground/src/examples.ts	Registers the new repro example in the playground examples list.
playground/examples/camera-fov-invalidation.ts	Adds a focused repro that pulses `camera.fov` (and near/far) without moving the camera.
packages/babylon-lite/src/shadow/shadow-base.ts	Seeds additional VP cache-key fields for injected shadow view-projection matrices.
packages/babylon-lite/src/camera/camera.ts	Keys projection caches on projection inputs so runtime `fov/near/far` mutations take effect immediately.
lab/public/bundle/manifest/scene1.json	Updates bundle-size baseline after camera cache-key change.
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bjsplat · 2026-07-02T19:34:51Z

Bundle Size Changes

Increases

Package	Current	Master	Change
Scene 10 — PBR Rough Sphere `scene10`	53 KB	52 KB	+1 KB
Scene 12 — PBR Shader Balls `scene12`	104 KB	103 KB	+1 KB
Scene 14 — Flight Helmet `scene14`	90 KB	89 KB	+1 KB
Scene 15 — SpotLights + Ground `scene15`	48 KB	47 KB	+1 KB
Scene 38 — Procedural Builders `scene38`	62 KB	61 KB	+1 KB
Scene 45 — Physics Collision Filtering `scene45`	52 KB	51 KB	+1 KB
Scene 48 — Physics Center of Mass `scene48`	55 KB	54 KB	+1 KB
Scene 55 — Billboard Sorting `scene55`	32 KB	31 KB	+1 KB
Scene 61 — NME Normal As Color `scene61`	55 KB	54 KB	+1 KB
Scene 67 — NME PBR Core `scene67`	77 KB	76 KB	+1 KB
Scene 72 — NME PBR Full (D8AK3Z) `scene72`	109 KB	108 KB	+1 KB
Scene 75 — Effect RTT Sphere `scene75`	51 KB	50 KB	+1 KB
Scene 82 — NME Procedural Noise `scene82`	67 KB	66 KB	+1 KB
Scene 83 — NME Normals `scene83`	71 KB	70 KB	+1 KB
Scene 85 — NME Matrix `scene85`	61 KB	60 KB	+1 KB
Scene 90 — CSG Operations `scene90`	60 KB	59 KB	+1 KB
Scene 100 — Physics Collision Event `scene100`	51 KB	50 KB	+1 KB
Scene 105 — Character Controller + Moving Platform `scene105`	103 KB	102 KB	+1 KB
Scene 125 — Gaussian Splatting bakeCurrentTransformIntoVertices `scene125`	38 KB	37 KB	+1 KB
Scene 127 — Gaussian Splatting Depth Rendering `scene127`	59 KB	58 KB	+1 KB
Scene 128 — Gaussian Splatting Depth Rendering (Alpha-blended) `scene128`	59 KB	58 KB	+1 KB
Scene 143 — Pipelined Post-processes `scene143`	71 KB	70 KB	+1 KB
Scene 150 — Manual X Slide Animation `scene150`	56 KB	55 KB	+1 KB
Scene 157 — glTF Weighted Animation Blend `scene157`	96 KB	95 KB	+1 KB
Scene 175 - Navigation Raycast `scene175`	96 KB	95 KB	+1 KB
Scene 202 - LWR Point Light `scene202`	50 KB	49 KB	+1 KB
Scene 206 - LWR Cutout Billboards `scene206`	63 KB	62 KB	+1 KB
Scene 209 — LWR Physics `scene209`	55 KB	54 KB	+1 KB
Scene 212 - DispersionTest glTF `scene212`	105 KB	104 KB	+1 KB
Scene 214 — Cascaded Shadow Maps `scene214`	69 KB	68 KB	+1 KB
Scene 218 — Vertex Animation Texture (VAT) `scene218`	93 KB	92 KB	+1 KB
Scene 227 — Multi-Canvas (Same Scene) `scene227`	49 KB	48 KB	+1 KB
Scene 245 — RecursiveSkeletons `scene245`	101 KB	100 KB	+1 KB

Sizes rounded to nearest KB. Run pnpm build:bundle-scenes locally to verify.

bjsplat · 2026-07-02T19:38:16Z

Lab - Static Site

Open deployed site

_{Build 20260702.16 - merge @ 0649cb7}

Address Copilot PR review feedback on #357: - Add unit test (tests/lite/unit/camera-projection-cache.test.ts) covering that fov / nearPlane / farPlane changes invalidate the projection and view-projection caches on a stationary camera (worldMatrixVersion fixed), plus aspect-ratio invalidation and cache stability when nothing changes. - Clarify the playground repro doc/comment: the camera is only stationary if you don't orbit; attachControl stays enabled for inspection but interacting bumps worldMatrixVersion and would mask the old bug. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

bjsplat · 2026-07-02T20:34:10Z

Bundle Size Changes

Increases

Package	Current	Master	Change
Scene 10 — PBR Rough Sphere `scene10`	53 KB	52 KB	+1 KB
Scene 12 — PBR Shader Balls `scene12`	104 KB	103 KB	+1 KB
Scene 14 — Flight Helmet `scene14`	90 KB	89 KB	+1 KB
Scene 15 — SpotLights + Ground `scene15`	48 KB	47 KB	+1 KB
Scene 38 — Procedural Builders `scene38`	62 KB	61 KB	+1 KB
Scene 45 — Physics Collision Filtering `scene45`	52 KB	51 KB	+1 KB
Scene 48 — Physics Center of Mass `scene48`	55 KB	54 KB	+1 KB
Scene 55 — Billboard Sorting `scene55`	32 KB	31 KB	+1 KB
Scene 61 — NME Normal As Color `scene61`	55 KB	54 KB	+1 KB
Scene 67 — NME PBR Core `scene67`	77 KB	76 KB	+1 KB
Scene 72 — NME PBR Full (D8AK3Z) `scene72`	109 KB	108 KB	+1 KB
Scene 75 — Effect RTT Sphere `scene75`	51 KB	50 KB	+1 KB
Scene 82 — NME Procedural Noise `scene82`	67 KB	66 KB	+1 KB
Scene 83 — NME Normals `scene83`	71 KB	70 KB	+1 KB
Scene 85 — NME Matrix `scene85`	61 KB	60 KB	+1 KB
Scene 90 — CSG Operations `scene90`	60 KB	59 KB	+1 KB
Scene 100 — Physics Collision Event `scene100`	51 KB	50 KB	+1 KB
Scene 105 — Character Controller + Moving Platform `scene105`	103 KB	102 KB	+1 KB
Scene 125 — Gaussian Splatting bakeCurrentTransformIntoVertices `scene125`	38 KB	37 KB	+1 KB
Scene 127 — Gaussian Splatting Depth Rendering `scene127`	59 KB	58 KB	+1 KB
Scene 128 — Gaussian Splatting Depth Rendering (Alpha-blended) `scene128`	59 KB	58 KB	+1 KB
Scene 143 — Pipelined Post-processes `scene143`	71 KB	70 KB	+1 KB
Scene 150 — Manual X Slide Animation `scene150`	56 KB	55 KB	+1 KB
Scene 157 — glTF Weighted Animation Blend `scene157`	96 KB	95 KB	+1 KB
Scene 175 - Navigation Raycast `scene175`	96 KB	95 KB	+1 KB
Scene 202 - LWR Point Light `scene202`	50 KB	49 KB	+1 KB
Scene 206 - LWR Cutout Billboards `scene206`	63 KB	62 KB	+1 KB
Scene 209 — LWR Physics `scene209`	55 KB	54 KB	+1 KB
Scene 212 - DispersionTest glTF `scene212`	105 KB	104 KB	+1 KB
Scene 214 — Cascaded Shadow Maps `scene214`	69 KB	68 KB	+1 KB
Scene 218 — Vertex Animation Texture (VAT) `scene218`	93 KB	92 KB	+1 KB
Scene 227 — Multi-Canvas (Same Scene) `scene227`	49 KB	48 KB	+1 KB
Scene 245 — RecursiveSkeletons `scene245`	101 KB	100 KB	+1 KB

Sizes rounded to nearest KB. Run pnpm build:bundle-scenes locally to verify.

bjsplat · 2026-07-02T20:37:51Z

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_{Build 20260702.17 - merge @ debeacf}

sebavan

Code LGTM. Regarding the size growth and perf hit. Wondering if we should have a manual invalidate instead or props to prevent the extra check every frame ? Not sure those params animates for instance ?

RaananW · 2026-07-03T13:10:04Z

@sebavan - Size increase is 0.1k, rounded to 1kb in the report. What perf hit do you see? the variable assignment?

sebavan · 2026-07-03T14:23:03Z

I am thinking of the constant check for changes on every call to getProjectionMatrix which on its own is pretty much nothing but one of the reason lite is so much faster than .js when adding it up accross the app.

RaananW · 2026-07-03T16:27:37Z

the extra 3 comparisons? is runs once per camera per frame, I can't really think of a cleaner way of doing that.
A "dirty" flag will, most certainly hurt performance or make the user force an update on their own. This is the other available solution - make the user set a flag saying "i changed the fov", or making the fov and the others a getter/setter.
comparisons are relatively cheap, but if you see it any other way I will change it, of couse

sebavan · 2026-07-03T17:12:53Z

yup this is what I meant by "manual invalidate instead or props", those are the 2 other options and they might be a better fit for lite favoring raw perf despite more verbose coding. Manual invalidate function could be ok as it would probably only be used in an editor scenario or not so common fov animation. so only those would pay byte + cpu cost.

I let you pick the right approach with @ryantrem.

Copilot AI review requested due to automatic review settings July 2, 2026 19:00

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fix(camera): invalidate projection cache on fov/near/far change#357

fix(camera): invalidate projection cache on fov/near/far change#357
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RaananW commented Jul 3, 2026 •

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RaananW commented Jul 2, 2026

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bjsplat commented Jul 2, 2026

Bundle Size Changes

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