Tom Melly wrote:
> 
> Hi,
> 
> Is there any way to make a solid height_field, so that if you difference
> from it (for example, a footprint), you would get an indent (unless you're
> Ken), and not a hole.
> 
> If not, what is the best approach to this problem?

  Actualy the best approach is not trying to csg the HF in this case. I
would instead add the foot prints to the HF image itself.
  In other cases were you want to add something like a cave through the side
of a mountain it is possible with a little creative CSG work. I have done so
in the past using an intersection and a difference of a cylinder through the
HF object. It takes a little bit of thinking on how CSG works but it is not
impossible.

  difference{
  intersection{
    height_field{tga "kpeak1.tga" smooth translate <-.5,-0.431,-.5>
    scale <128, 72, 128>rotate y*270 pigment{ rgb 1 }finish{ambient .7}}
    cylinder{<0,0,-120>,<0,0,154>,10 inverse pigment{rgb 1} finish{ambient .7}}}
    cylinder{<0,0,-120>,<0,0,154>,10 open    pigment{rgb 1} finish{ambient .7}}}

This worked for me once when adding a see through cave in a mountain peak image
I was working on. Your milage may vary and will depend on the topography of the
HF you attempt to apply it to.

-- 
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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