9.5.2

824 • CHAPTER 18
MATERIAL EDITOR • 825
Diffusion
The Diffusion page lets you darken and lighten the material in specic areas using a diffusion map.
Diffusion maps are especially useful for making material look dirty and more realistic. You can use
either a normal texture or a shader as the diffusion map. (If the texture is colored, it will still be treated
as a grayscale map.) The darker a pixel in the diffusion map, the darker the corresponding region of
the material.
Affect Luminance, Affect Specular, Affect Reection
Enable the Affect Luminance option if you want the diffusion map to affect the luminance property.
The darker a pixel in the diffusion map, the darker the corresponding region of the luminance. This
helps you add irregularities to the luminance to achieve a more natural look.
If the Affect Specular option is enabled, the diffusion map is applied to the specular property as well.
This will reduce the material’s specular values where the diffusion map is dark. This option is enabled
by default since it adds to the realism considerably.
Enable Affect Reection if you want to apply the diffusion map to the reection and environment
properties for an even more natural look. The darker a pixel in the diffusion map, the darker the
corresponding region of the reection.
Texture, Mix Mode, Mix Strength
For details on these settings, look up ‘texture settings’ in the index.