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In order to calculate the caustics effects, V-Ray uses a technique known as photon mapping. It is a two-pass technique. The first pass consists of shooting 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 second pass is the final rendering, when the caustics are calculated by using density estimation techniques on the photon hits stored during the first pass.

 

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When the render engine is set to CUDA, the Caustics rollout is not available.

 

UI Path

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||Render Settings window|| > GI tab > Caustics rollout

 

 

 

Caustics Parameters

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On – Turns – Turns rendering of caustics on and off .

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Notes

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  • Caustics also depend on the individual light settings (see Light Attributes).
  • For accurate caustic calculations, disable the VRayMtl's Affect Shadows parameter when using caustics. Simultaneous usage of both Caustics and Affect Shadows can be used for artistic purposes but will not produce a physically correct result.

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