In article <Pin### [at] lexxinfelineorg>,
 Ketil Froyn <ket### [at] froynname> wrote:

> To do an experiment, I want to render a reflective parabolic surface (a
> newtonian reflective lens, for the astronomy buffs). My problem is that
> the surface stops being reflective if I make it too "flat". I have
> renedered a sample here, where the object in the centre is supposed to be
> a parabolic mirror pointing at the camera. You can view the image and the
> source at:

Probably a precision issue. Try using smaller values for accuracy and/or 
increasing max_gradient. Also, you might want to look at using a 
polynomial shape for the parabola rather than an isosurface...it will 
likely give more accurate results, possibly faster as well. Look in the 
shapes_old.inc include file, specifically for Paraboloid_X and its 
relatives.

BTW, you have an interesting name...I guess I'm not the only one who 
thinks so, seeing that it's the first item on your web site. I guess you 
don't have much trouble getting mixed up with other people...I sat next 
to another Chris in Spanish class, and the teacher loved to turn in our 
general direction and just say "Chris! You're next!".

-- 
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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