Previous:Slope Maps   Main Index   Next:Bump Maps

Normal Maps and Normal Lists

Most of the time you will apply single normal pattern to an entire surface but you may also create a pattern or blend of normals using a normal_map. The syntax for a normal_map is identical to a pigment_map except you specify a normal in each map entry.

The syntax for normal_map is as follows:

normal_map{ NORMAL_MAP_BODY }

Where Value is a float value between 0.0 and 1.0 inclusive and each NORMAL_BODY is anything which can be inside a normal{...} statement. The normal keyword and {} braces need not be specified.

Note that the [] brackets are part of the actual NORMAL_MAP_ENTRY. They are not notational symbols denoting optional parts. The brackets surround each entry in the normal map. There may be from 2 to 256 entries in the map.

For example

  normal {

    gradient x       //this is the PATTERN_TYPE

    normal_map {

      [0.3  bumps scale 2]

      [0.3  dents]

      [0.6  dents]

      [0.9  marble turbulence 1]



When the gradient x function returns values from 0.0 to 0.3 then the scaled bumps normal is used. From 0.3 to 0.6 dents are From 0.6 up to 0.9 a blend of dents and a turbulent marble is used. From 0.9 on up only the turbulent marble is used.

Normal maps may be nested to any level of complexity you desire. The normals in a map may have slope maps or normal maps or any type of normal you want.

A normal map is also used with the average normal type. See "Average" for details.

Entire normals in a normal list may also be used with the block patterns such as checker, hexagon and brick. For example...

  normal {


      normal { gradient x scale .2 }

      normal { gradient y scale .2 }



Note that in the case of block patterns the normal wrapping is required around the normal information.

You may not use normal_map or individual normals with a bump_map. See section "Texture Maps" for an alternative way to do this.

You may declare and use normal map identifiers but the only way to declare a normal block pattern list is to declare a normal identifier for the entire normal.

Previous:Slope Maps   Main Index   Next:Bump Maps