POV-Ray : Newsgroups : povray.advanced-users : Re: Problem with Bicubic Patch : Re: Problem with Bicubic Patch Server Time
2 Jun 2024 11:07:48 EDT (-0400)
  Re: Problem with Bicubic Patch  
From: Christoph Hormann
Date: 5 Jul 2001 11:32:39
Message: <3B4488E8.6F2EF805@gmx.de>
Eli Ewok Brody wrote:
> 
>  All --
>     I'm sure this has been a problem before, perhaps even solved before. At
> any rate, I am becoming desperate. sPatch objects (eg. Unions of bicubic
> patches) do not support world xyz coords. This turns shading into a
> nightmare. I've tried lots of combinations - not making it a union, merging
> them, assigning textures individually... nothing works. It's possible to
> make a triangle mesh out of it, but I have never been impressed by meshes,
> and would rather use slightly more resolution independant objects. (The best
> being Our Friend the Primitive.)
>     What can I do? Is there some bug in POV-Ray? Is there something simple
> I'm overlooking?

This is certainly a bit the wrong group for such things (so i set followup
to p.a-u)

First of all bicubic patches are internally converted to meshes in povray
so it's not reasonable why you couldn't achieve the same accuracy with a
mesh.  Another thing which i already mentioned in another reply, bicubic
patches are a very limited shape, only certain surfaces can be modelled
and when you try to approximate cylinders, spheres etc. with several
patches you will have to expect strange results.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/


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