In article <4009d739@news.povray.org>,
 Bill Hails <bil### [at] europeyahoo-inccom> wrote:

> I would assume that if I have two isosurfaces
> that are coincident along a line, say the top
> of a cylinder oriented along x touching a y plane,
> and if I add or subtract the same noise function
> to both isosurfaces, say f_noise3d, then the
> resulting surfaces would still be coincident
> (along a now distorted line).

I'm not really sure what you want. You have a cylinder resting on a 
plane, and want a deformed cylinder resting on a deformed plane?
Within limits, adding noise to the cylinder function is equivalent to 
varying the radius of the cylinder, adding it to the plane function 
varies the height of the plane. I think you are expecting it to always 
move a given point on the surface in the same direction by the same 
distance. For that, you will need to perturb the coordinates given to 
the function...the easiest way would be to use warps:

function {pattern {function {...} turbulence ...}}

Apply the same warp to both isosurfaces, and they will be deformed in 
the same way.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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