2008

Noise group
Left: Original scene
Right: Noise added to the fog
Noise options for volume fog are comparable to the noise options for materials.
Type Choose one of three types of noise to apply.
Regular The standard noise pattern.
Fractal An iterative fractal noise pattern.
Turbulence An iterative turbulence pattern.
Invert Reverses the noise effect. Dense fog becomes translucent and vice
versa.
Noise Threshold Limits the noise effect. Range=0 to 1.0. When the noise
value is above the Low threshold and below the High threshold, the dynamic
range stretches to fill 0-1. This makes for a smaller discontinuity (First order
instead of 0 order) at the threshold transition, and thus produces less potential
aliasing on page 7708 .
High Sets the high threshold.
Low Sets the low threshold.
6518 | Chapter 19 Effects and Environments