Am 18.08.2010 13:08, schrieb ghostch:
> Hello everyone!
> My question regards the rendering speed of smooth triangle meshes. What I have
> tried is to reduce the number of triangles of my meshes using VTK's decimator
> routine: Since the meshes originally come from a marching cubes triangulation,
> they consist of a large number of relatively small triangles - many of them
> coplanar. So the decimator eliminates up to 90% of the triangles without visible
> loss of detail.
> However, for povray it takes double or triple the time to render the reduced
> meshes. Why is that? Could it be that the different sizes of triangles in the
> reduced mesh (the decimator tends to produce very "long" triangles with sharp
> angles sometimes)?

I guess it has something to do with POV-Ray's internal bounding for 
meshes. For the sake of bounding, equilateral triangles are the optimum, 
as they will tend to have the smallest bounding boxes for any given 
triangle surface size.

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