Hello, I'm Alberto from Italy..
I would want to modify an height_field with a normal pattern (granite for
example..) and then generate a new 16 bit grayscale image (png or tga..) to
re-use in other height_field statement..
is possible to do this?

I have written this basic sample:
//------------------------------
#include "colors.inc"

global_settings {
   hf_gray_16 on
}

camera {
   orthographic
   location <0.518756, 1.42622, 0.517175>
   sky <0, 1, 0>
   direction <0, 0, 1>
   right <1, 0, 0>
   up <0, 1, 0>
   look_at <0.518487, 0.464293, 0.493562>
}

height_field {
   png "HFtest01.png"
   scale <1, 0.3, 1>
   rotate <0, 0, 0>
   translate y*0.0870551

   texture {
      normal { granite 0.4 }
      pigment { color rgb <0.32549, 0.32549, 0.32549> }
      finish { ambient 1 }
   }
}
//--------------------------------------
....but render shows me nothing, please can someone help me?

Thanks, Alberto

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