> Oh, maybe my description is not so clear.
> what i want is the volume raytracing technique based feature in povray.
> I know that we can render the implicit iso-surface by using the existing
> keyword "isosurface" in povray, but it seems that it is based on some
> technique like Marching Cube, which first extraction the geometry of the
> iso-surface. But with volume raytracing technique, we can directly 
> raytrace
> the volume data and save the geometry extracting step.

Look up df3 files and media in the POV docs, it might do what you want 
(never used it myself).

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