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!

Topic		Replies	Views
Crash when disposing light (ClusteredLights need to be present) Bugs lighting	4	43	September 26, 2025
Gl_max_vertex_uniform_buffers Questions	9	115	April 7, 2026
Clustered lighting with NME has glitches Bugs nme , clustered-lighting	2	33	September 30, 2025
ClusteredLighting breaks library materials Bugs clustered-lighting	1	39	January 26, 2026
Snapshot Rendering does not support Clustered Lighting Bugs	5	45	April 13, 2026

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

Related topics