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V-Ray for SketchUp â Materials â The Refraction Layer â V-Ray Tutorials. Refraction means the change of direction of a ray of light in passing at an angle from one medium to another. With V-Ray the refraction layer is used to create glass or translucent materials. How to use the refraction layer to create glass or translucency materials in this video tutorial.
The index of refraction for the ordinary ray is constant and is independent of direction. The index of refraction for the extraordinary ray is a continuous function of direction. The index of refraction for the ordinary ray is independent of direction. The two indices of refraction are equal only in the direction of an optic axis. The measure of birefringence (Î´) [delta] is the difference between the indices of refraction of the two rays.