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This value modulates RGB values as if they were light paths, and are represented in scene units. For example, a value of <0.5,0.4,0.2> will scatter red light 0.5 scene units. These values are multiplied by the Unit Length attribute and if set too high , they will escape the surface giving you unexpected results.
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Light can scatter forward or backwards inside a surface. Using anisotropy, you can cause the light to scatter more strongly forward along the direction of the light ray. This may have the effect of making the object appear more transparent.
This attribute behaves slightly different with different Albedo Inversion Models. For human skin, a value of 0.7 is recommended when using Pixar's Albedo Inversion Model, and a value of 0.2 is recommended for Chiang Albedo Inversion Model.
Bleed (Davis Mode Only)
This can increase the distance light travels, just like the Radius control. However, this control attempts to maintain the finer details while making light scatter further.
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- Pixar - Albedo inversion model used at Pixar which prioritizes the albedo color as a final result.
- Chiang - Albedo inversion model which more closely represents the traditional random walk model published in 2016.