mapping - textures with patterns.
"Mapping" is a raytracing and rendering technique, which adds
textures to the surface of shapes by two different methods:
1. color_map / pigment_map / texture_map / normal_map
This is a kind of surface design by a pattern of stripes of
colors or pigments or textures or normal structures (color_map / pigment_map / texture_map / normal_map)
with more or less turbulence.
These stripes are calculated by a function (gradient<0,1,0> / agate / bozo / wood / etc.) distributed over the whole
three dimensional space. If we add such a texture to an geometric object, so it is like cutting out this object from a block
that is totally filled by this structure like wood.
We can move these textures to get another part of its structure on the surface
of our object.
2. image_map / material_map / bump_map
The second method we are thinking better as the projection of a diapositive
on the objects - the only difference: it is also visitable on the backside! Here the image (allowed types are: iff, gif, tga, png, sys)
is projected on the space in different kinds.