jhu <nomail@nomail> wrote:
> For example, an putting an image_map on a box using planar
> mapping would actually require constructing six boxes, one for each side,
> and then placing the texture on each side separately

  No, it doesn't require that, as this simple example demonstrates:

camera { location -z*6 look_at 0 angle 35 }
light_source { <15, 20, -50>, 2 }

box
{ -1, 1
  uv_mapping
  pigment { image_map { jpeg "image" } scale <1/4, 1/3> }
  rotate y*30 rotate x*-30
}

> But for something like a superellipsoid, how would this be done?

  Emulating the box-shaped uv-map with a pattern is certainly not
trivial, but doable. This should do something like that (note that
you can put different pigments at different sides):

camera { location -z*6 look_at 0 angle 35 }
light_source { <15, 20, -50>, 2 }

#declare Pyramid = function { abs(x) < y & abs(z) < y };

#declare CubePattern =
  function
  { Pyramid(x, -z, y)*1/6+
    Pyramid(y, x, z)*2/6+
    Pyramid(x, z, y)*3/6+
    Pyramid(y, -x, z)*4/6+
    Pyramid(x, -y, z)*5/6
  };

#declare Image =
  pigment
  { image_map { jpeg "image" }
    translate -.5
    scale 2
  };

#declare ThePigment =
  pigment
  { function { CubePattern(x, y, z) }
    pigment_map
    { [0/6 Image rotate x*90]
      [1/6 Image]
      [2/6 Image rotate -y*90]
      [3/6 Image rotate -y*180]
      [4/6 Image rotate y*90]
      [5/6 Image rotate -x*90]
    }
  };

superellipsoid
{ <.2, .2>
  pigment { ThePigment }
  rotate y*30 rotate x*-30
}


-- 
                                                          - Warp

Post a reply to this message