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How to cull the backside of a mesh but keep the lights inside?

Blender Asked on November 20, 2021

First off: the "backface culling" option for materials doesn’t seem to do anything.

Second: I got the effect I wanted (almost) by using the Geometry node to mix a Transparent shader with a Principled BSDF using Backfacing as the Factor:

enter image description here

I need to keep the lights inside the rooms "trapped". The light should not be escaping like it is. How can I fix this?

One Answer

In your picture, lights look like point. try with out lights and change the color of cubes: picture 1 enter image description here

secondly, add black ground with a material with many roughness: picture 2

enter image description here

And play with cube's nodes

according to me it's the only solution.

Answered by romain on November 20, 2021

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