For this example, the Caustics subdivs parameter for the light was set to 4,000, the global caustics Multiplierto 17,000, and the Search distance to 0.5. As can be seen, the larger value of the Max photons parameter in the second image causes the caustics to appear much smoother.
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Max photons = 1
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Max photons = 60
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Search distance - 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.
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Example: The Search Distance Parameter
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For this image, the Caustics subdivs parameter for the light is set to 50, so that the separate photons are more distinct; the global caustics Multiplieris 17000, and the Max photons are set to 60. As can be seen, the larger search distance produces blurrier caustics.
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Search dist = 1
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Search dist = 10
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Example: The Light Caustics Subdivs Parameter
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This example is similar to the previous one, but the Caustics subdivs parameter for the light is increased to 300. The other parameters are the same as in the previous example. As can be seen, the larger number of photons produces smoother caustics effects than in the previous example.
