Not doing so leaves photons fallen behind refractive surfaces inside the Refraction RE, but not inside the Caustics one The Affect Channels option should be set to Affect all Channels in refractive materials to ensure the Caustics render element contains also the ones fallen behind refraction.Affect Shadows should be off in refractive materials if they are to generate caustics.Tips when working with progressive caustics: The second pass is the final rendering, which is when the caustics are calculated by using density estimation techniques on the photon hits stored during the first pass. The first pass consists of shooting light particles (photons) from the light sources in the scene, tracing them as they bounce around the scene, and recording the places where the photons hit the object surfaces. The other method, Photon Mapping, is a two-pass technique. It is loosely based on two papers: one on Progressive Photon Mapping from Knaus and Zwicker, and another on Metropolis-guided caustics tracing from Šik and Krivánek. The new Progressive caustics solver uses advanced sampling techniques, and is able to trace as many photons as required without suffering the memory constraints of traditional Photon Mapping techniques. V-Ray supports the rendering of caustics effects by using one of the following techniques: photon mapping or progressive.
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