Wasn't it houmr who wrote:
>Hi! Is it possible to make a genetral transformation of an object in Povray in
>the way that I assign a new values (x',y',z') to the existing x,y,z coordinates
>of the object, according to some rule? E.g. I have the following: x'=x; y'=
>y+0.8*z*(y*z)/(300-z); z'=0.8*z . I was trying to play around with matrix, but
>it doesn't seem to be the way.

You can't perform non-linear transformations on general POV objects, but 
if you can express your object as an isosurface function you can perform 
non-linear variable substitution on that function.

http://www.econym.demon.co.uk/isotut/substitute.htm#nls

-- 
Mike Williams
Gentleman of Leisure

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