In article <l20h8us9sqrsng4tdrn8kl9h6o2mvd2prq@4ax.com>,
 W?odzimierz ABX Skiba <abx### [at] babilonorg> wrote:

> AFAIK they mix terms. They write about OpenGL as raytracer but afaik OpenGL is
> not a raytracer. Am I right ? I'm not an expert but this thing looks at first
> sight like Moray with OpenGL preview.  Perhaps with speed improvements. I'm
> sceptical :-)

OpenGL has no built-in support for raytracing, but there is a trick 
which has to do with getting it to render a single pixel and getting the 
depth of that pixel. The result is intersection information...very 
roundabout and probably too inefficient to be useful, but I don't really 
know.
You could also use scanline rendering instead of tracing the primary 
rays, if you don't mind everything being converted to polygons. Same 
technique: use the depth buffer to find the intersection points. Barely 
something you could consider raytracing, but it accomplishes the same 
thing.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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