Ilya Razmanov <ily### [at] gmailcom> wrote:

> It seems like people are capable to define procedural, that is,
> algorithmic textures and stuff (for example, normals), to be calculated
> by POVRay internally, to be used in scenes.

Welcome to functions!

https://wiki.povray.org/content/Reference:Function

"Declaring User-Defined Color Functions
Right now you may only declare color functions using one of the special function
types. The only supported type is the pigment function. You may use every valid
pigment. This is a very simple example:

#declare foo = function {
  pigment {
    color red 1
    }
  }

#declare Vec = foo(1,2,3)
An example using a pattern:

#declare foo = function {
  pigment {
    crackle
    color_map {
      [0.3, color Red]
      [1.0, color Blue]
      }
    }
  }"

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