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There are three types of particle interaction in media: absorbing, emitting, and scattering. All three activities may occur in a single media. Each of these three specifications requires a color. Only the red, green, and blue components of the color are used. The filter and transmit values are ignored. For this reason it is permissible to use one float value to specify an intensity of white color. For example the following two lines are legal and produce the same results:
emission 0.75 emission rgb<0.75,0.75,0.75>
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