Hi everyone, Super mean bug here. I have not figured out yet how to reproduce . So I can only the describe and hope. In sum, I cannot have shadows and clustered lighting. More specifically, the bug throws a WebGL warning [.WebGL-0x47fc04470d00] GL_INVALID_OPERATION: glDrawElements: It is undefined…

Good news: this PR (done because of Crash when disposing light (ClusteredLights need to be present) ) fixes the problem in your PG! Clustered lights: Fix crash when disposing lights master ← Popov72:fix-clusteredlights-dispose …

Can you run a test in WebGPU? The error message (if any) could provide additional information about the issue. Of course, a repro would be ideal, as it seems that a number of fairly specific conditions are required to reproduce the bug.

Oh, here we go. Nice trick, thanks Evgeni_Popov :slightly_smiling_face: Texture “lightDataTexture0” not found in the material context. Make sure you bound it (something like effect.setTexture(“lightDataTexture0”, texture)). entry={“binding”:0,“visibility”:2,“texture”:{“sampleType”:“float”,“viewDi…

I think you are using a node material? To make it work in WebGPU with clustered lights, you must set the shader language to WGSL, see (2nd paragraph): Babylon.js docs

I am afraid not. The problem mesh itself has a PBRMaterial instance. I do have NodeMaterials, disabled them, but still got the crash. The crash happens when rendering mesh "B"². webgpuCacheBindGroups ; source reproduced below. ²Mesh.render() → Mesh._draw() → engine.drawElementsType() → engine._dra…

Without reproduction (even an external link), it will be difficult to investigate… I don’t understand why the bind group expects to transmit the light data texture via “lightDataTexture1” when the material context refers to it as “lightDataTexture2”… I tried to reproduce this situation, but without …

[image] Evgeni_Popov: Without reproduction I think I have just found one way. Technically, in my local project, the bug does happen earlier before I run the code I have replicated. But the error is the same. So I am just hoping it is the same cause somehow. So anyway, here is the playground:…

No way, cool :smiley: Thanks Evgeni_Popov! Sorry, for not using it earlier. I thought it is not related due to the disposing thing. And it says it right there in the PR how you can easily test it on any playground! https://playground.babylonjs.com/?snapshot=refs/pull/17206/merge#WLDCUC#267

Mesh invisible and WebGl warn when clustered lights and directional light (whitelist mode) on

Bugs

Evgeni_Popov September 27, 2025, 9:46pm 9

Good news: this PR (done because of Crash when disposing light (ClusteredLights need to be present)) fixes the problem in your PG!

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Mesh invisible and WebGl warn when clustered lights and directional light (whitelist mode) on

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