In article <Xns### [at] 204213191226>,
 "Rafal 'Raf256' Maj" <raf### [at] raf256com> wrote:

> I just found out that linear_spline prism can be render about 20% faster, 
> just after changing it to mesh (or even - set of triangles)

Your message is very confused...first you say meshes are 20% faster, 
then you give numbers showing they are slower. And your scene code uses 
a lot of variables and tra() and qua() macros without defining them.


> mesh  55 sec
> prism 51 sec
> union 41 sec
> 
> hmm personaly I would expect somthing different :)
> 
> is't this some kind of bug ? imho mesh should be the fastest ?

What is your point? You made some assumptions and then say it must be a 
bug when they turn out to be incorrect? It's a bug that reality doesn't 
match your opinion of how things should be? Sure, why don't we slow down 
unions and prisms to fix this...

A mesh is a different shape from a union, it is specially designed to 
handle large numbers of triangles. The prism mesh probably just isn't 
big enough to get the advantages of a mesh. A prism is completely 
different from either a union or a mesh. If prisms were limited to being 
convex, the linear spline prism primitive could probably be the fastest, 
but they aren't limited in that way. This is an isolated special case, 
and doesn't indicate any bugs anywhere.

-- 
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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