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Blender 4.0, Cycles. How to create a material that is not affected by light? I would like to make this part not affected by light

Blender file: DOWNLOAD

enter image description here

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  • $\begingroup$ You might want to give more context about what you are trying to achieve, so even if it's not 100% possible ,there are probably a work around $\endgroup$
    – Emir
    Dec 5, 2023 at 0:04
  • $\begingroup$ If you can see it, it's affected by light. I'm guessing you mean 'not affected by direct light from source X' ? $\endgroup$
    – Robin Betts
    Dec 5, 2023 at 7:09
  • $\begingroup$ You could use the new Light Linking but the object won't receive anymore light from the light $\endgroup$
    – moonboots
    Dec 5, 2023 at 7:58

1 Answer 1

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If we express the problem differently, the solution becomes apparent. The areas of the floor that receive light are the ones that do not have an object casting shadows on them. Therefore, our objective is to add an invisible object that will only cast shadows there. This kind of object is often called a shadow caster.

Its setup is simple. You just need to uncheck its Ray Visibility to everything except Shadows. This can be found in the Object Properties under Visibility.

Shadow Caster


Edit: Screenshots showing the effect of the shadow caster and the modified blend file are attached below.

Before:

Before

After:

After

Blend file:

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