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In addition to specifying blended colors with a color map you may create a blend of pigments using a pigment_map. The syntax for a pigment map is identical to a color map except you specify a pigment in each map entry (and not a color).
The syntax for pigment_map is as follows:
- pigment_map{
}
- [
]
Where Value is a float value between 0.0 and 1.0 inclusive and each PIGMENT_BODY is anything which can be inside a pigment{...} statement. The pigment keyword and {} braces need not be specified.
Note that the [] brackets are part of the actual PIGMENT_MAP_ENTRY. They are not notational symbols denoting optional parts. The brackets surround each entry in the pigment map. There may be from 2 to 256 entries in the map.
For example
sphere {
<0,1,2>, 2
pigment {
gradient x //this is the PATTERN_TYPE
pigment_map {
[0.3 wood scale 0.2]
[0.3 Jade] //this is a pigment identifier
[0.6 Jade]
[0.9 marble turbulence 1]
}
}
}
When the gradient x function returns values from 0.0 to 0.3 the scaled wood pigment is used. From 0.3 to 0.6 the pigment identifier Jade is used. From 0.6 up to 0.9 a blend of Jade and a turbulent marble is used. From 0.9 on up only the turbulent marble is used.
Pigment maps may be nested to any level of complexity you desire. The pigments in a map may have color maps or pigment maps or any type of pigment you want. Any entry of a pigment map may be a solid color however if all entries are solid colors you should use a color_map which will render slightly faster.
Entire pigments may also be used with the block patterns such as checker, hexagon and brick. For example...
pigment {
checker
pigment { Jade scale .8 }
pigment { White_Marble scale .5 }
}
Note that in the case of block patterns the pigment wrapping is required around the pigment information.
A pigment map is also used with the average pigment type. See "Average" for details.
You may not use pigment_map or individual pigments with an image_map. See section "Texture Maps" for an alternative way to do this.
You may declare and use pigment map identifiers but the only way to declare a pigment block pattern list is to declare a pigment identifier for the entire pigment.
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