Herman Serras wrote:
> 
> Hello,
> 
> If you want to read something about how the coodinates of the vertices
> of a dodecahedron and icosahedron can be obtained starting from a cube:
> take a look at some of my pages.
> http://cage.rug.ac.be/~hs/
> In this way one can see how the golden number/golden section occur in
> those two solids.
> A number of pictures are produced using POVRAY.

Interesting read and links.  My math teacher should like this.

> But P. Bourke has done a very interesting work in publishing the data
> for people who aren't very interested in the mathematics behind those
> polyhdra, and like their beauty!
> I agree that I don't have such nice textures! I'd liked to learn more
> about the possibilies of POVRAY!
>

The tetrahedron has a color map where I used "hot" colors including
2*<1,1,0> for bright yellow in a marble pattern.
The octahedron has a color map with a wrinkle pattern and blue colors
that I picked out with the pick o color program.
I put the pigment into my sky include file.  The cube or hexahedron has
a pigment map that uses stone and concrete pigments,
which I made for my museum, in a gradient y pattern.  The icosahedron
has a marble color map that uses deeper blues I chose
from the color picking program.  The dodecahedron has a granite pattern
with a little white and a lot of gray25 as rgb .25.  It
also has a low filter value of .15.
I intended the polyhedra to represent the ancient greek elements.

tetrahedron	fire
octahedron	air
cube		earth
icosahedron	water
dodecahedron	ether

The texture on the plane was first developed for my Venus celestial box
(sun and moon ones posted on December 31).
Brendan

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