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Refraction

Refraction is the familiar physical phenomenon of light traveling differently through different materials and thus reflecting differently off objects behind that material. For example, if you have a glass of water with a straw in it, the part of the straw that’s not in water appears to be in a different angle to the part that is in the water. This is due to water bending the light waves.PrmanRender uses raytracing to create this effect and you can use the Refraction node to adjust the result. Without the PrmanRender node and RenderMan Pro Server software though, the Refraction node has no effect.

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