In article <38b7e1ea@news.povray.org>, "Bill DeWitt" 
<the### [at] earthlinknet> wrote:

> > Or that your media container and the isosurface are occupying the same
> > region of space?
> 
>     Right, I have an isosurface which is sitting on top of and projecting
> down into a media container.

What does that mean, "projecting down into"?
Do you have a light source on the opposite side of the isosurface, so 
it's shadow falls on the media?


> > Does it occur with the media turned off?
> 
>     No.

Ok, it is probably due to the many times a ray has to be shot at the 
isosurface from the media to compute where the shadow is. But you said 
it only happens in the area where the isosurface overlaps with the media 
container...have you tried other objects which tend to be slow, like 
julia_fractal? Is the isosurface transparent? If so, is it hollow?


> > What trace level is it going up to(this should be in the rendering
> > statistics)?
> 
>     Trace level? Under trace there is a "Quality" listing that says "9"...

No, the the maximum level to which POV traced. The max_trace_level 
keyword sets the upper limit to this, and the maximum level actually 
computed is in the rendering statistics. If there is some total internal 
reflection, that might be using a very large number and eating up 
processor time, but I don't think that is the problem.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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