Hi all,

I've drawn up a hollow spherical shell, and have a thin cylinder poking through
it like a straw.  I want to highlight just the intersection spots where this
cylinder meets the shell.  My code looks like this:

intersection
{
 sphere{<0,0,0>,4 hollow
 }

 cylinder{PStart,PEnd,0.5 open
 }


 texture{
  pigment{color Green transmit 0}
  finish{ambient 0.5 phong 0.5}
 }
}

When I run this, it appears that the sphere is always treated like a solid
object -- I can get the cylinder inside the sphere, or outside if I use
"inverse", but not the true intersection points.  Deleting "hollow" doesn't
change the behavior.  What should I do differently?

Thanks!

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