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This example demonstrates the effect of the Fog color. Note how color only changes the way the volume reacts to light, and not the volume transparency. A A sphere shaped as the V-Ray logo has been used to confine the fog volume with the VRayEnvironmentFog set as the Volume material in the shading group material of the sphere.
For the last 2 images, the Fog color has been mapped with a texture. World XYZ mapping type was used for the textures.
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