<ast### [at] t-onlinede> wrote:

> how can I render implicit and parametric surfaces with povray without
> using any external programs ?

Depends on what you mean by "external programs". You can use an 
unofficial version of POV-Ray which has been modified to support 
isosurfaces and parametric objects, like MegaPOV:
http://nathan.kopp.com/patched.htm


> I have tried to make lots of smooth_triangles with some macros, but you
> can clearly see the edges of these triangles (ugly).

Well, make sure your normal calculating code is right, otherwise you can 
just use smaller triangles and more of them. This can use up your memory 
quite fast, though...

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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