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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.
An explanation of why refraction occurs when light travels from a medium with a given refractive index to a medium with another is easily explained by the path integral formulation of quantum mechanics (the complete method was developed in 1948 by Richard Feynman).or example, a light ray will refract as it enters and leaves glass, assuming there is a change in refractive index. A ray traveling along the normal (perpendicular to the boundary) will change speed, but not direction. Refraction still occurs in this case.