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/* fog.sl - Standard fog volume shader for RenderMan Interface.
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* (c) Copyright 1988, Pixar.
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* The RenderMan (R) Interface Procedures and RIB Protocol are:
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* Copyright 1988, 1989, Pixar. All rights reserved.
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* RenderMan (R) is a registered trademark of Pixar.
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fog (float distance = 1;
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color background = 0;)
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d = 1 - exp (-length(I)/distance);
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Ci = mix (Ci, background, d);
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Oi = mix (Oi, color(1,1,1), d);