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Caustic TagThe caustic tag extends the camera object with the possibility to render your scene with caustics. But first of all what are caustics? Caustics are these nice light patterns you can see when the light shines through a glass of wine or through a lens. Caustics can be also seen when light is reflected at some reflective metal or plastic object.
The caustic tag works closely together with the "caustic photons" property of Light object. In the light object you can specify how many photons your light source emits. The photons are traced through the scene and are stored at the surfaces which they hit. The collections of all the photons in the scene are called the photon map. After the photon tracing path the renderer collects the photons in the nearby area of any pixel and calculates the light intensity at that point. To render caustics it is important that as many photons as possible hit the reflective or transparent surfaces and get collected in the photon map. If to less photons hit these material you will get quite ugly caustics as you can see on the first image below. Increasing the number of shot photons will cure that problem.
Tips:
Attention: You can only add a caustic tag to a camera object. Properties
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