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This page offers information about the Caustics effect in V-Ray for Cinema 4D.
Overview
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Parameters
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Example: Search Distance
For this example, the light used in the scene is V-Ray Sun. The Caustics method is set to Progressive and the Search Distance is set in Pixels. The V-Ray Sun has its Photon emission properties adjusted as so: Caustics Subdivs are at their default value of 1500; the Caustics Mult is set to 2 and the Photon Radius is set to 30 cm.
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Tips when working with progressive caustics: Required:
Optional
Managing Expectations:
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Progressive Caustics Advantages
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Progressive Caustics Limitations
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Photon Map method
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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, use local light settings. Search Distance Units – Specifies the units of the caustics photon lookup radius. 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 of photons on that surface in the area surrounding the shaded point (search area). The search area is a circle with a center at the original photon and its radius is equal to the Search Distance value. Smaller values produce sharper, but more noisy caustics; larger values produce smoother, but blurrier caustics. For more information, see the Search Distance example. Search Distance World/Pixels – Specifies the photon lookup radius in pixels or world units. Max Photons – Maximum number of photons within the search area circle that are considered when rendering the caustics effect on a surface. Smaller values cause less photons to be used and the caustics are sharper, but noisier. Larger values produce smoother but blurrier caustics. Assigning a value of 0 means that V-Ray is not limited and uses all the photons that it can find inside the search area. Max Density – This parameter allows you to limit 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 looks 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. Caustics Photon Map File – Specifies the file used to load the caustics photon map when the Mode is set to From File. Click the Browse button to the right to specify the file name. Auto Save – When enabled, V-Ray automatically saves the caustics photon map to the file specified in the Auto Save File field when rendering is complete. Auto Save File – Specifies the file to which the caustics photon map is saved when Auto Save is enabled. Click the Browse button to the right to specify the file name. |