Here is an example of the "odd" behavior I find.  (Odd to me anyway..)

#version 3.0
global_settings {assumed_gamma 2.2}
light_source {<-100, 100, -500> color White * 1.0}
background {Blue}

camera {
   location <0, 0, -3>
   look_at  <0, 0,  0>
}

#declare RedSheet =
object {
   height_field {
      tga "AnyFile.tga"
      hierarchy off
      pigment {Red}
      translate <-0.5, -0.5, -0.5>
   }
   rotate <90,0,180>
   scale <1, 1, 0.005>
}



#declare RedSheetHole =
object {
   difference {
      object {RedSheet}
      torus {0.24, 0.14 pigment {Green} rotate x * 90}
   }
}

object {RedSheetHole scale 2}

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...




"Patrick Dugan" <pat### [at] usticom> wrote in message
news:3872213e@news.povray.org...
> I have trying (somewhat successfully) to "chop" heightfields.  I first
used
> a bounded_by statement to make the heightfield round (to cut of the
corners)
> but then trying to remove a "chunk" from the inside is difficult.  When I
> tried using the difference statement it never works and whatever the
object
> is (cube for example) ends up showing up regardless of using difference or
> union.  I finally tried using a difference with a cube (with a clear
> pigment) which seems to work but according to the Povray docs I shouldn't
be
> trying a "difference" with a heightfield.  I guess my question is are
there
> any "easy" ways to remove material from a hieghtfield without going to
> convoluted methods??
>
>

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