In article <3ef133dd$1@news.povray.org>,
 "Ray Gardener" <ray### [at] daylongraphicscom> wrote:

> So, similar to REYES, "troublesome" polygons simply
> get broken up into smaller and smaller pieces until
> the CSG test becomes as easy as raytracing. The user
> can also tune the dicing recursion level to trade
> quality vs. speed. The only real hard part is making
> good inside/outside determiner routines for a triangle checked
> against each of the possible primitives. A lazy routine would
> treat more polygons as needing dicing, slowing things down.

This may be useful for scanlining, but what I'm after is a method for 
generating meshes for general use. For just raytracing, it would be 
possible to just use an ordinary CSG of solid meshes, but then you have 
to store the CSG structure, you end up with a CSG instead of a mesh. 
What needs to be done is remove some triangles and add some new ones to 
lace up the edges. Subdivision at this point will be useful, but not to 
micropolygons...the triangles need to be stored, render-time subdivision 
would require information about the CSG structure. It may not be 
necessary though...things like proximity and glow effects (two other 
things I plan to use tessellation with) may work fine with simple 
quick-and-dirty removal of triangles that are entirely contained in 
another object.


> > How does your preview currently function? An OpenGL preview was one of
> > the ultimate goals of my patch, but I never got started on it.
> 
> The details are in the patch's readme.txt, but what I did
> yesterday was to add a Render_Style INI parameter to treat
> scanlining and raytracing as selectable render methods.
> The options are

What I actually meant was: how are you tessellating and drawing the 
objects? Did you add an object method to draw in OpenGL, or one to 
tessellate to a mesh which is used by drawing code elsewhere? Or 
something else?

-- 
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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