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Node
The The V-Ray BRDFScatterVolume node provides inputs for controlling the various material properties. See the Parameters section below for more information about the input slots.
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Parameters
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Mode – Allows the user to determine which method is used to control the sub-surface scattering effect.
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Radius – Controls the amount of light scattering in the material. Smaller values cause the material to scatter less light and to appear more diffuse-like; higher values make the material more translucent. Note that this value is specified always in centimeters (cm); the material will automatically convert converts it into scene units based on the currently selected system units.
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Phase Function – A value between -1.0 and 1.0 that 0 and 1.0 that determines the general way light scatters inside the material. Its effect can be somewhat likened to the difference between diffuse and glossy reflections from a surface, however the phase function controls the reflection and transmittance of a volume. A value of 0of 0.0 means 0 means that light scatters uniformly in all directions (isotropic scattering); positive values mean that light scatters predominantly forward in the same direction as it comes from; negative values mean that light scatters mostly backward. Most water-based materials (e.g. skin, milk) exhibit strong forward scattering, while hard materials like marble exhibit backward scattering. This parameter affects most strongly the single scattering component of the material. Positive values reduce the visible effect of single scattering component, while negative values make the single scattering component generally more prominent. For more information, see the Phase Function example below.
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Light Mult. – Multiplier for the direct lighting on the volume. A value of 1.0 is physically accurate. Larger values may be used to make the volume appear brighter.
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