Height_fields have depth, but only the "field" surface
is rendered... so you need to difference off a
slightly smaller box to give it edges...

difference {
   height_field {
     png "plasma3.png"
     rotate x*-90
     translate <-0.5,0,0>
     scale <fw*2,fh,0.2>
   }
   box{<-0.49,0.01,0>,<0.49,0.99,-1> inverse scale <fw*2,fh,0.2>}
   box{<0,-0.1,-2> <fl,4,2> rotate -fa*z translate <0,fh,0>}
   box{<0,-0.1,-2> <fl,4,2> rotate -fa*z translate <0,fh,0> scale -x}
}

or alternately, treat it as just a surface of triangles,
and use clipped_by ...

height_field {
   png "plasma3.png"
   rotate x*-90
   translate <-0.5,0,0>
   scale <fw*2,fh,0.2>
   clipped_by {
      box{<0,-0.1,-2> <fl,4,2> inverse rotate -fa*z translate <0,fh,0>}
      box{<0,-0.1,-2> <fl,4,2> inverse rotate -fa*z translate <0,fh,0> 
scale -x}
   }
}

Post a reply to this message