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Approximate – Uses an approximate formula which is faster than Ray-Traced scattering and produces good-looking results. Brighter areas of the volume would transfer light farther than dark areas. This option is not supported by the Volumetric Geometry render mode. |
Use Volume Light Cache | lightcache – Enables light caching for each voxel of the grid, which speeds up bucket rendering considerably when the voxel size of the grid is significantly larger than the rendering pixel. If the grid resolution is large enough compared to the rendering resolution, disabling this option will speed up rendering.
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Light Cache Speedup | subred – [V-Ray specific] [Valid only when Use Volume Light cacheCache is enabled] The higher this option is set, the faster the rendering will be, but the lower the quality of the Phoenix Volume Light Cache. You can increase this parameter and gain render speed as long as you don't start getting dark cubic grid artifacts on the smoke.
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