How to render background material or skybox below everything else?

By default, rendering group ids go from 0 to 4. You can change the MIN_RENDERINGGROUPS and MAX_RENDERINGGROUPS properties in RenderingManager to modify this range.

So, if you set MIN_RENDERINGGROUPS = -1, you will be able to set the renderingGroupId property of the skybox to -1 without changing the renderingGroupId of the other meshes:

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