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VRay Sun & Sky
The VRaySun and VRaySky are special features which are provided by the V-Ray renderer. Developed to work together, the VRaySun and VRaySky reproduce the real-life Sun and Sky environment of the Earth. Both are coded so that they change their appearance depending on the direction of the VRaySun.
The V-Ray Sun and Sky are based largely on the SIGGRAPH'99 paper "A Practical Analytic Model for Daylight" by A. J. Preetham, Peter Shirley, Brian Smits.
VRaySky can be added as an environmental pass shader.
V-Ray supports all animated geometry deformation types and most animated color parameters on ICE clouds and on individual objects.
V-Ray supports baking into textures, ptex and vertex colors.
For more information see V-Ray Render Map Property.