In article <3ee5f3e7@news.povray.org>,
 "Thorsten Froehlich" <tho### [at] trfde> wrote:

> > You could probably do something somewhat similar to bounding...do an
> > assay render on the bounding box of a group of triangles.
> 
> No, because you would have to be able to keep multiple levels.  A bounding
> box is bigger than the actual geometry.  So only looking at the frontmost
> bounding box isn't enough.

I don't think you understood what I meant. Draw from front to back. Use 
single bounding boxes for closely spatially related groups of triangles, 
maybe with an oct-tree structure. If the bounding box of a group is 
occluded by triangles that have already been drawn (it has no pixels at 
lesser depth), all those triangles are also occluded, so no need to draw 
them. I'm assuming no alpha-style transparency, because you mentioned 
backside culling. Nothing to do with the frontmost bounding box, except 
that you could skip the test for the frontmost few levels because they 
are so unlikely to be occluded.

-- 
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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