Setting Diffusion Using a Texture
When you assign a texture to the Diffusion channel, the texture's alpha channel determines which areas of the surface have high diffusion and which have low diffusion. Bright areas in the alpha channel have a high diffusion value and darker areas have low diffusion values.
When you use a texture to set the Diffusion channel, the grayscale values in the texture's alpha channel determine the diffusion of the objects.
If you're using a texture to set Diffuse Color, the texture's color channel is used and the value in the Diffusion value determines the intensity.
Examples:
If you're using a texture to set the Diffusion value, the texture's alpha channel determines the Diffusion intensity.
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