When i use " mat.maxSimultaneousLights = 20" Windows system will appear error, Mac system is normal

[haoguang_shen]

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When I delete "mat.maxSimultaneousLights = 20 " windows system is normal .

[Evgeni_Popov]

Here’s an explanation on why there is a limit on the number of lights you can use for a mesh at once:

Light material limit

There is a limit on the number of uniform buffers used in a shader. It seems 12 is a common value, at least it’s the one of my GPU for the vertex shader. Each light consumes a buffer. Babylon is also using a buffer for the scene, mesh and material objects. So, with 9 lights, you reach the limit of 12. Adding a new light will get you an error saying that you exceed the maximum number of uniform buffers you can use in a vertex shader. In 4.2 we did not create a uniform buffer for the mesh data, s…

[haoguang_shen]

when I set ‘mtl.maxSimultaneousLights = 300’, Still report the previous error ,
Do you need to set the parameters larger,eg:mtl.maxSimultaneousLights = 600

[haoguang_shen]

windows system still appear this error when i use your playground .

[Evgeni_Popov]

Depending on your GPU, the number of lights that can be active at once will change: decrement the value of the loop bound until it works: on my GPU it is 9.

[haoguang_shen]

Ok,I get it,thank you.