When an image_map is used in a height_field function, the resulting HF shows a
"mirror image"...lower corner of the image_map at x=0, z=1 of the HF, rather
than at x=0, z=0. Adding rotate 180*x or scale -y corrects this (no
translations needed):

height_field{
   function 300,300{
       pigment{image_map{sys "my_image.bmp" map_type 0 interpolate 2}
               rotate 180*x // or scale -y
              }
                   }
            }

Not a problem, once you know that it's necessary.  But I was wondering what the
underlying reason is for the mirror imaging.

Ken W.

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