Search distance units – Specifies the caustics photon lookup radius units. You can choose between World or Pixels. When V-Ray needs to render the caustics effect at a given surface point, it searches for a number photons on that surface in the area surrounding the shaded point (search area). The search area in fact is a circle with center the original photon and its radius is equal to the Search distance value. Smaller values produce sharper, but perhaps more noisy caustics; larger values produce smoother, but blurrier caustics. For more information, see The Search Distance Parameter example in the expandable field below. Search dist – Specifies the photon lookup radius in pixels. Max photons – Specifies the maximum number of photons that is considered when rendering the caustics effect on a surface. Smaller values cause fewer photons to be used and the caustics are sharper, but noisier. Larger values produce smoother, but blurrier caustics. The special value of 0 means that V-Ray uses all the photons that it can find inside the search area. For more information, see The Max Photons example in the expandable field below. Max density – Limits the resolution (and thus the memory) of the caustics photon map. Whenever V-Ray needs to store a new photon in the caustics photon map, it first checks if there are any other photons within a distance specified by Max density. If there is already a suitable photon in the map, V-Ray just adds the energy of the new photon to the one in the map. Otherwise, V-Ray stores the new photon in the photon map. Using this options allows you to shoot many photons (and thus get smoother results) while keeping the size of the caustics photon map manageable. Mode – Controls the mode of the irradiance map. New map – When this option is selected, a new photon map is generated. It overwrites any previous photon maps left over from previous rendering. From file – When you enable this option, V-Ray does not compute the photon map but loads it from a file. Hit the Browse button on the right to specify the file name. Save to file – Press this button if you want to save an already generated photon map in a file.
File – The file name with the caustics photon map to be loaded when the Mode is set to From file. - To write and load *.vrpmap files per frame, use %04d frame formatting token.
- Caustics also depend on the individual light and geometry properties (see the Object/Light settings).
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