Yes. there is a need for a higher max_trace_level. About 15 seems okay,
but 150 was better, somewhere inbetween perhaps then. I was going to say
it probably is coincident surfaces but the effect goes away, or appears
to anyway. The container objects being invisible to start with might not
make it obvious but still cause trouble, not sure. At the default trace
level it didn't show any change when I rescaled the boxes down slightly.


Ken wrote:
> 
> Ken wrote:
> >

> > >
> > > Hi all!
> > >
> > > I wanted to create a rgb-cube by putting together 10^3 smaller cubes
> > > filled with an emission media. But there are some strange black
> > > squares between the smaller cubes! Changing density, transmit and/or
> > > filter values didn't help.
> > >
> > > Does anyone know where the problem is??
> > >
> > > Thanx in advance,
> > > Daniel
> >
> >   I don't have time to look at your source now but try adding a
> > nax_trace_level in your global settings. I would start with
> > something like 30 or more with this many objects in the scene.
> 
> I didn't see the image either until now. Um there is a problem in
> pov called coincident surfaces where if you have transparent objects
> whose faces occupy the same space like two boxes abutting each other
> the raytracer cannot decide which surface belongs to which object.
> The easiest way to avoid this is to seperate them by a tiny amount
> or have them overlap by a tiny amount. If you overlap them you can
> also use a merge operation to remove all of the inner surfaces.
> Read up in the docs about csgs and coincident surfaces.
> max_trace_level can still be an issue so don't hesitate adding
> that to your scene too.
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net
> http://home.pacbell.net/tylereng/links.htm

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