Re: [Caml-list] OpenGL

[Issac Trotts <ijtrotts@ucdavis.edu>]

On Thu, Apr 08, 2004 at 11:25:33PM +0100, Jon Harrop wrote:
> On Thursday 08 April 2004 9:19 pm, Issac Trotts wrote:
> > What it is about lablGL that means it can never be made to work?
> 
> I'll give some background information first. The GLU tesselator accepts a 
> polygon (as a list of contours) and a winding rule. It uses this to generate 
> a set of non-overlapping OpenGL primitives (triangles, triangle fans and 
> triangle strips) which cover the regions in the contours which are deemed to 
> be interior according to the winding rule.
[...]

My GLU binding is more general than the one in the LablGL distro.  It's
in the LablGL CVS repository.  You might ask Jacques Garrigue for
access.

> > That one is called camlgl, which seems to have been abandoned.
> 
> That's the one, yes. I've never used it...
> 
> > I already wrote a binding for GLU using CamlIDL, but I don't recommend
> > it since GLU relies so much on callbacks.  It would probably be better to
> > wrap Jonathan Shewchuck's Triangle code:
> >
> >     http://www-2.cs.cmu.edu/~quake/triangle.html
> 
> That is certainly a very nice looking library, but it seems to be solving a 
> related but substantially different problem (Delaunay triangulation vs 
> polygon tesselation)?

Shewchuck's program does constrained Delaunay triangulation, so it can
tesselate a large class of polygons.  In order to get triangle fans and
strips, you'd have to run a triangle strip generator on the output.

-- 
Issac Trotts
http://mallorn.ucdavis.edu/~ijtrotts
(w) 530-757-8789

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