Hello BabylonJS team. I encounter a WebGL error (It is undefined behaviour to use a uniform buffer that is too small) when toggling lights on a scene with freezed materials. I tried to unfreeze materials before toggling a light and it doesn’t throw any errors. Here is a repro https://playground.…

Are you using 4.2 or 5.0? See: [image] Babylon 4.2 enabling spotlight gives webgl uniform error Questions That will be hard to help on this one, as we don’t do fixes of older Babylon versions. Have you tried with 5.0? I know we fixed some “It is undefined behaviour to us…

I’m using Babylon 4.2, but i encounter the error with Babylon 5.0 too

I think it’s expected (pinging @sebavan / @Deltakosh ): When freezing a material, the current state is “frozen” and especially the lights that were in effect at freezing time. If later on you modify the set of lights that are in effect, it will crash (as you experienced it). The workaround is to do wh…

Yup totally expected but I wonder how we could make it more obvious “console.err” something ?

I don’t see an easy way to console.log something. We would need to record the whole state at freezing time (maybe there are other things than the lights that may break) and compare the current state with the frozen state each time we have to draw something… Not very easy and efficient I think.

Yup makes sense, I am not seeing it either :slight_smile:

I just noticed something else, the problem isn’t present if i use two directional light instead of a directional light + an hemispheric light.

Yup cause they are using the exact same uniform layout :slight_smile: so it is a lucky shot

WebGL error when toggling lights with freezed materials

Bugs

Evgeni_Popov September 10, 2021, 1:43pm 2

Are you using 4.2 or 5.0?

See:

Topic		Replies	Views
Babylon 4.2 enabling spotlight gives webgl uniform error Questions	2	960	July 27, 2021
Error when combining setEnabled, FAST Snapshot Rendering, frozen materials, and animation Bugs	3	83	May 19, 2026
Trying to manage a set of lights per camera view (getting WebGL error : GL_INVALID_OPERATION) Questions	5	1476	March 27, 2020
Material freezing not working (?) Bugs	1	388	May 25, 2023
Materials getting darker when disabling shadows Bugs	15	801	December 8, 2020

WebGL error when toggling lights with freezed materials

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