In article <38727c28@news.povray.org>, "Patrick Dugan" 
<pat### [at] usticom> wrote:


> Although I have declared the "RedSheetHole" to be a DIFFERENCE between
> the heightfield and the torus, the end result is a union rather than
> difference.  I am confused since the syntax I have used "seems" correct 
> to me.  Please advise...

If you use:
object {RedSheetHole scale 2 rotate y*250}
you will see that the "union" of the torus and the height field is 
actually the depression left in the heightfield from the torus. If you 
want a hole to be in this area instead, give the torus a clear texture 
so it is invisible. Or you could use this instead:
#declare RedSheet =
object {
   height_field {
      png "plasma2.png"
      hierarchy off
      pigment {Red}
      translate <-0.5, -0.5, -0.5>
   }
   rotate <90,0,180>
   scale <1, 1, 0.005>
   clipped_by {
      torus {0.24, 0.14 inverse rotate x * 90}
   }
}

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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