mihm17 wrote:
> 
> Hi,
> 
> does anyone have an answer to help me out here ?
> 
> I am trying to render an animation of the surface of a biological
> molecule, which is composed of thousands of triangles.
> The rendering of such an animation takes a few minutes per frame.
> 
> I would now like to cut the molecule half-open to see the interior,
> while it rotates. If I introduce a
> clipped_by { box { <-1000,-1000,-1000>, <1000,0,1000> }
> command, the rendering time decays to about 12 hours per frame.
> The same slowdown happens, when I use the difference command.
> 
> Does anybody know how to speed this up ?

The reason this is taking so long is because you are doing a csg
operation on 1000's of objects. Each object that is intersected
by the box must be evaluated seperately which greatly increases
the rendering time. You may be able to speed things us a bit by
manually bounding the object(s) in question but I doubt the increase
will be signifigant. If you can figure out a way to create your
molecule object out of a few primitive objects instead of serveral
thousand traingles you can probably speed things up quite a bit.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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