clipka <ano### [at] anonymousorg> wrote:

> Arranging the control points the other way round ("clockwise" vs.
> "counter-clockwise") should to the job.

I thought so too, since it ought to be just like triangles, but using either
  uv_vectors <0,0> <1,0> <1,1> <0,1>
or
  uv_vectors <0,0> <0,1> <1,1> <1,0>

gave me the same result.

bicubic_patch {
  type 1
  flatness 0.1

  u_steps 4 // number of triangles to subdivide (1 to 5)
  v_steps 4 // number of triangles to subdivide (1 to 5)
  //uv_vectors <0,0> <1,0> <1,1> <0,1>
  uv_vectors <0,0> <0,1> <1,1> <1,0>

  <-2, 0,  2>, <-1, 0,  2>, <1, 0,  2>, <3, 0,  2>,
  <-2, 0,  1>, <-1, 0,  1>, <1, 0,  1>, <3, 0,  1>,
  <-2, 0, -1>, <-1, 0, -1>, <1, 0, -1>, <3, 0, -1>,
  <-2, 0, -2>, <-1, 0, -2>, <1, 0, -2>, <3, 0, -2>

 uv_mapping
   interior_texture  { pigment { image_map { png "Numbered_Grid-Red-Blue.png"  }
scale 1} finish {phong 0.6 phong_size 20}}
     texture { pigment { image_map { png "Numbered_Grid-Red-Green.png" } scale
1} finish {phong 0.6 phong_size 20}}

  scale <1, 1, 1> rotate <180, 0, 0> translate <0, 0, 0>
} // end of bicubic_patch
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