I overlooked the scaling down of each individual box before. There is no
possibility of coincident surfaces.


Bob Hughes wrote:
> 
> 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
> 
> --
>  omniVERSE: beyond the universe
>   http://members.aol.com/inversez/homepage.htm
>  mailto://inversez@aol.com?Subject=PoV-News

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