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I have a plane with an object coming out of it. No materials are assigned. I placed a Point light in front of the scene, illuminating the whole surface. You can clearly notice a difference between the two surfaces.

example

How can I disable those differences? I am building a virtual model in which no light scattering should be present. I want the materials to behave equally if exposed to the same light (like a perfect projector).

I tried with different materials with no success.

EDIT: I am projecting some light pattern onto the surface. So I want the material to evenly reflect the pattern, without any scattering/shadow.

If I usa a RGB input (thanks to @Christopher Bennett) the material does not interact with projected light. E.g. the central object does not reflect the yellow chessboard pattern like: Not reflecting

Instead I want the chessboard to be "stamped" on the object, again with no other light effect.

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2 Answers 2

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Do you mean something like this? - just plug an RGB input into the Material output. This is what you could call "unshaded", there will be no shadows or light scattering of any kind.

Unshaded

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  • $\begingroup$ Thanks. I should be more precise: I am projecting a light pattern on the surface. I want this pattern to be reflected by the material with no scattering/shadows. $\endgroup$
    – decadenza
    Commented Oct 22, 2020 at 8:38
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The answer of @Christopher Bennett could be the right one, depending on what you're doing. I was unclear in the question (see edit above).

The solution for me was to assign a Diffuse BSDF material to the objects with roughness=1. This way I got the effect I wanted:

enter image description here

You can see that the object is still there (lines are not straight).

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