POV-Ray : Documentation : Pigment Maps and Pigment Lists
  POV-Ray 3.6 Documentation Online View Color Maps Image Maps Pigment Maps and Pigment Lists

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 { PIGMENT_MAP_BODY }
    [ Value PIGMENT_BODY ]

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 {
    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. Color Maps Image Maps

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