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. Refer to the VRaySky page for more details about the texture.
The V-Ray Sun and Sky are based largely on the model presented in [ 1 ]. For a more complete list of references, please see the References and links section.
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Image courtesy of Tamas Medve
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UI Path: ||Create menu|| > Lights > V-Ray...
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Create menu||> Lights > V-Ray > V-Ray Sun > click and drag in a viewport