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Henrik Kragh avatar image
Henrik Kragh asked ·

Scattering color of standard volume doesn't affect color of light exitting.

If an object with a standard volume shader scatters a completely red color, why is the light that comes through to the other side still the same color, as when it entered the volume? If white light enters such a volume, and then all the red wavelengths gets scattered, shouldn't that make the light exitting on the other side be tinted to the more bluish/greenish spectrum? Like rayleigh scattering? I would have thought such an effect would just work with Arnold. Am I missing something?

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Henrik Kragh avatar image
Henrik Kragh answered ·

Exactly... Red is the color of the light that gets scattered (In this example).

So white light enters. The red wave lengths of the white light gets scattered. The rest gets through (Or gets absorbed). So that leaves primarily blue/greenish wavelengths getting through. Yet the light getting through has the same color as when it entered, unless I artificially color it with the transparency channel of the volume shader.

It feels like the shader is not very physically based, but just scatters a color. Not the light itself.

Right?

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Stephen Blair avatar image
Stephen Blair answered ·

The scatter color is the color of the light that gets scattered. So it's red that is out scattered, not white-red.

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