The irony, Chris, is that it fails where the normal calculation is a
no-brainer: you've got a straight edge there.  The "top" surface is AOK; the
edges for these step functions have diffuse=0.

Chris Huff wrote:

> In article <39c4295a@news.povray.org>, "Greg M. Johnson"
> <"gregj;-)56590\""@aol.c;-)om> wrote:
>
> > I posted an image in p.b.i. under  the title of "Lines on isosurfaces."
> > I asked for help about a trivial problem and discovered a more serious
> > one.  I am using essentially a step function in an isosurface.  I find
> > that mega refuses to give me any diffuse reflection for this object.
>
> I think the most likely explanation is that it can't compute the correct
> normal for those surfaces.
>
> --
> Christopher James Huff
> Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
> TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
>
> <><

Post a reply to this message