You realize that people will recommend an isosufrace to do this, don't you?
Actually, the problem is the disc.
If I take the disc out of the equation I get the heightfield "bounded" by the
torus, which I had to adjust the scale on to make some sense of it, which I
assume is because I have a different image than you do (I used one of my noise
tga files that I'm using in my IRTC entry)

Try this:
#declare o_chairseat=
difference
{
 union
 {
  torus
  {
   0.5, 0.05
   scale < 1.0, 0.5, 1.0>
   translate < 0.0, 0.4, 0.0>
  }
 }
 height_field
 {
  tga "break1.tga"
  smooth
  translate <-0.5, 0.0,-0.5>
  scale < 1.5,-0.1, 1.5>
  translate < 0.0, 0.426, 0.0>
 }
}

object {o_chairseat pigment { rgb 1 } finish { phong 1 } }

difference {
   cylinder
  {
   < 0.0, 0.425, 0.0>, < 0.0, 0.375, 0.0>, 0.5
 }
   height_field
 {
  tga "break1.tga"
  smooth
  translate <-0.5, 0.0,-0.5>
  scale < 1.5,-0.1, 1.5>
  translate < 0.0, 0.426, 0.0>
 }
  pigment { rgb <1,1,0> }  }

Josh

Paul Vanukoff wrote:

> Ok, I'm stumped. Anyone know why this doesn't work?
>
> <snip>
>
> My intended effect is to rough up the upper surface of the disc/torus union
> using the heightfield. The gif is nothing special, just some light noise.
> What I get though is the disc/torus union with the height_field kind of
> attached to the top of it. What gives? I can post images to p.b.i if
> requested.
>
> --
> Paul Vanukoff
> van### [at] primenetcom

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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