> Warp <war### [at] tagpovrayorg> wrote:
>> lien <nomail@nomail> wrote:
>>> In fact, I want to render the implicit iso-surface embeded in 3D volume data
>>> set.
>>   Could you explain what that means?
>>
>> --
>>                                                           - Warp
> 
> 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.
> 

As far as I understand there is no extraction of geometry in POV-Ray's 
isosurfaces, it indeed uses what you call "volume raytracing". In other 
words, for each ray the intersection with the surface is computed, but 
the surface is not reconstructed as a whole.

Regards

-- 
Vincent

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