"turbulent"
Class	Colour
Synopsis	This shader simulates the variations in a turbulent medium such as smoke or patchy fog. Although designed to define the density of the medium used by the "scattering medium" foreground, it may be used also on its own for interesting surface effects.
Arguments	"scale" Description: Overall scale of the effect, increase for patchy fog, decrease for highly turbulent smoke. Default: 1.0 Hint: [ 0.01, 1000 ] "colour" Description: The colour of the turbulence. Default: [1.0, 1.0, 1.0] Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ] "detail" Description: Defines how much detail is present in the turbulence. Higher values will cause more local variations. Increasing this value may produce interesting effects but will significantly increase computation time. Default: 2 Hint: [ 0, 8 ] "amplitude" Description: The amplitude of the turbulence. Default: 0.5 Hint: - "contrast" Description: Relative measure of the contrast between dense and rare areas. 0.5 is neutral. Increasing the contrast will result in more sharp transitions with an almost solid appearance of dense areas at the value of 1.0. Decreasing the contrast will smooth the transitions. Sharp contrast will usually result in increased computation costs. Default: 0.5 Hint: -

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