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Thanks Ken.
I cannot reduce the number of triangles my scenery is composed of.
The biological molecule is that complicated, and the electron-microscopical
3D structure of that membrane-protein should be scientifically visualized
without simplifications or alterations.
I used now a
Pre_Frame_Commmand = my_clip %k
and clip the set of triangles outside of POVray. This works, and I can
calculate again
a frame in a few minutes.
BUT: Why is this faster than POVray can do ?
Is it that POVray is clipping the whole 3D scenery for every pixel/ray all
over again ?
Wouldn't it be much faster to once clip the 3D scenery while reading the
scene,
and then do the raytracing without further clipping calculations ?
Or is there a kind of Preprocessor incorporated into POVray ?
Yours, Henning.
Ken wrote:
> 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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