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Based on | difSource – The source channel used to determine the smoke color. By default, it is a uniform simple color set by the Constant color option. The other options require the corresponding channel to be present in the cache files and remapped to the internal Volume Grid channels using the 3rd Party Channels Mapping dialog in the Input tab.

Disabled
Temperature
Smoke
Speed
Fuel
Texture
Constant Color
RGBDisabled – The smoke color will not be rendered.
Temperature – The smoke color will be based on the values of the Temperature cache channel and can be remapped using the color gradient.
Smoke – The smoke color will be based on the values of the Smoke cache channel and can be remapped using the color gradient.
Speed – The smoke color will be based on the values of the Speed cache channel and can be remapped using the color gradient.
Fuel – The smoke will be based on the values of the Fuel channel.
Texture –  The smoke color will be based on the values of a texture map plugged into the Texture slot.
Constant Color – The smoke color will be the same for the entire volume and will be taken from the Constant Color box.
RGB – The smoke will be based on the values of the RGB channel.

Texture | difTexture – If Based on is set to Texture, this slot specifies which texture to use.

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UI Text Box
typenote
  1. This option refers to the internal Volume Grid Light Cache, which is not related to the V-Ray Light Cache.
  2. When using V-Ray Progressive Rendering, this option might slow down rendering startup or the overall render speed. 
  3. This feature might produce artifacts when the smoke is very dense.
  4. This feature might produce artifacts when objects cast shadows through the smoke.
  5. Rendering multiple copies or instances of the Volume Grid node with this option turned on might lead to slow-downs.
  6. When rendering in Volumetric Geometry mode, for any of these Render Elements: [ Shadows ], [ Raw Shadows ], [ Global Illumination ], [ Raw Global Illumination ] , the Volume Grid Light Cache will require additional memory to produce the correct result. Please be aware that these Render Elements (and most other V-Ray Render Elements except for [ Atmosphere ] and [ Self-Illumination ] ) do not work in Volumetric mode.
  7. This option is ignored when using V-Ray GPU. It is a CPU-only feature that helps speed up Bucket rendering.

Light Cache Speedup | difLightCacheSR – Used only when Use Light cache is enabled. Because the smoke renders more slowly than the Diffuse geometry, lowering smoke quality can speed up rendering. This option reduces the light sampling and thus increases the noise.

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