Reference:User Defined Pattern
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New in version 3.8 a special pigment pattern user_defined
has been added to define the pigment color directly in terms of a set of functions.
The syntax is a follows:
pigment { user_defined { function { RED_FUNCTION }, function { GREEN_FUNCTION }, function { BLUE_FUNCTION }, function { FILTER_FUNCTION }, function { TRANSMIT_FUNCTION } } }
Each function is optional, in which case the corresponding component is set to 0. For example, the following sets the color to rgbft <x,y,0,0,z>
:
pigment { user_defined { function { x }, function { y }, ,, function { z } } }
The pattern is similar to image_map
in that it directly specifies colors rather than using a color_map
or pigment_map
.
The user defined pattern functionality also extends to density blocks, of course using only the red, green and blue function values. See also: Density