Am 04.02.2013 19:36, schrieb Sven Littkowski:

> 1
> I have a cylinder and would like to know, if it is possible to make that
> cylinder appear like made of thousands of hexagonal facets, in the way the
> cylinder reflects light or how its shaded areas are.

Depends on what exactly you want to achieve. How about the hexagon 
pattern with a cylindrical warp?

> 2
> Some materials in nature or our environment appear being in one color when seen
> from one angle, but when the viewer's angle changes, they appear in another
> color. Does POV-Ray allow such an effect, and if, how?

That's a definite yes: The aoi pattern (new in POV-Ray 3.7) was added 
with exactly such effects in mind.

You might also want to try the irid keyword, although it only caters to 
one particular angle-dependent physical effect (thin film interference). 
Its implementation in 3.6 was crappy, but it has been reworked for 3.7.

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