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This example shows the effect of the Phase function parameter. This parameter can be likened to the difference between diffuse reflection and glossy reflection on a surface. However, it controls the reflectance and transmittance of a volume. Its effect is quite subtle, and mainly related to the single scattering component of the material.

 

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width30%60%
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Phase function = -1.0

.6

(Backward Scattering)

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Phase function = 0.0 (Isotropic Scattering)

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 Phase

Phase function = 1.0

.8

(Forward Scattering)

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Phase function = -0.5 (Backward Scattering)

 

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width30%

Phase function = 0 (Isotropic Scattering)

 

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width30%


Phase function = 0.5 (Forward Scattering)

 

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