Error when combining setEnabled, FAST Snapshot Rendering, frozen materials, and animation

syuilo · May 18, 2026, 2:38am

Combining these conditions will produce an error in the console.

I was unable to identify a minimal reproducible code that clearly shows the exact conditions under which this error occurs.

Because of that, this pg contains a partial extraction of the implementation from my actual project as-is.

I have removed as much unrelated code as possible, but please note that it may still include some code that is not strictly necessary for reproducing the issue.

Thank you for maintaining this great framework!

Evgeni_Popov · May 18, 2026, 9:18am

Thanks for the report! We have a fix for this, but we need to wait for a larger PR to be merged first: Tree-shaking - the pure barrel by RaananW · Pull Request #18441 · BabylonJS/Babylon.js · GitHub. Once that lands, we should be able to move the fix forward.

syuilo · May 18, 2026, 9:55am

Thank you for the quick fix!
I’m sorry I couldn’t provide clean pg on my end.
Looking forward to seeing the fix applied!

Evgeni_Popov · May 19, 2026, 8:22am

PR has been created:

github.com/BabylonJS/Babylon.js

Fix frozen material light binding for WebGPU (#18472)

master ← Popov72:fix-webgpu-snapshot-frozen-material-light-buffer

opened 08:22AM - 19 May 26 UTC

Popov72

+61 -26

> 🤖 *This PR was created by the create-pr skill.* ## Summary - Rebind light uni…form buffers for frozen Standard, PBR, OpenPBR, and Background materials when the engine requires uniform buffers to be rebound every draw. - Preserve the existing frozen-material optimization for view, fog, morph target, baked vertex animation, log-depth, and image-processing binding. - Add a regression test covering frozen material light binding with `needToAlwaysBindUniformBuffers`. ## Motivation Fixes a WebGPU FAST snapshot rendering issue reported on the forum where combining `setEnabled`, frozen materials, and animation could log missing `Light0` draw-context buffer errors. Forum thread: https://forum.babylonjs.com/t/error-when-combining-setenabled-fast-snapshot-rendering-frozen-materials-and-animation/63477 ## Testing - `npx vitest run --project=unit packages/dev/core/test/unit/Materials/babylon.material.test.ts` - `http://localhost:1338/?webgpu#QHOKIS` produced no console errors locally - Targeted Prettier + ESLint on changed files - Targeted WebGL2/WebGPU visualization tests for `Node Material 0`, `Texture Repetition - Standard Material`, `Texture Repetition - PBR Material`, and `Texture Repetition - OpenPBR Material`

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Error when combining setEnabled, FAST Snapshot Rendering, frozen materials, and animation

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