Building once again upon the core of the snow macro, here are some corrosion 
textures with true displacement. Thus far, you may choose to have the effect 
protrude from the surface or be subtracted from it giving an acid etched 
look. You may specify a single vector as the only trace point, or as the 
center point (or otherwise) of various methods of casting the effect upon 
the surface, including from all sides.

The colormaps used here were taken from many images of corossion of the 
appropriate metals, and appear in order they were found on those surfaces. 
(ColorImpact SLAYS, and exports to pov compatible 0-1 RGB format).

From left to right using single vector casting are Aluminum, Copper, and 
Ferrous metal corrosion effects. Please ignore the crappy metal texture I 
used on the main object, you choose what texture is input to the macro to be 
corroded. I am exploring the ability to use an image to place the effect on 
a given surface, effectively allowing you to "paint" it on to one degree or 
another.

Keep in mind this is my first shot at this, so it isn't exactly where I want 
it quite yet.

ian

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