Multiplier - this multiplier controls the strength of the caustics. It is global and applies to all light sources that generate caustics. If you want different multipliers for the different light sources then you should use the local light settings. Note: this multiplier is cumulative with the multipliers in the local light settings. Mode
Mode - controls the mode of the irradiance map: - New map - when this option is selected a new photon map will be generated. It will overwrite any previous photon map left over from a previous rendering.
- From file - when you enable this option V-Ray will not compute the photon map but will load it from a file. Hit the Browse button on the right to specify the file name.
File - the file name with the caustics photon map to be loaded when the Mode is set to From file. Save - this will save to file the photon map which is currently in memory. Note that the Don't delete option in the On render end group must be turned on. Otherwise V-Ray will automatically delete the photon map at the end of the rendering process. On Render End
Don't delete - when checked, V-Ray will keep the photon map in memory after the scene rendering has finished. Otherwise the map will be deleted and the memory it takes will be freed. This option can be especially useful if you want to compute the photon map for a particular scene only once and then reuse it for further rendering. Auto save - when this is turned on, V-Ray will automatically save the caustics photon map to the file provided in the Auto save file field when rendering is complete. Notes
- Caustics also depend on the individual light settings.
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