"Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote:
>
> Have a look at the code below.
>
> Tor Olav
>
> // ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
>
> #version 3.6;
>
> // ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
>
> #declare PatchesInWidth = 2;
> #declare PatchesInHeight = 2;
>
> #declare PatchPoints =
>   array[PatchesInHeight][PatchesInWidth][4][4] {
>     {
>       {
>         { < 0,  0,  0>, < 1,  0,  0>, < 2,  0,  0>, < 3,  0,  0> },
>         { < 0,  0,  1>, < 1,  1,  1>, < 2,  1,  1>, < 3,  0,  1> },
>         { < 0,  0,  2>, < 1,  1,  2>, < 2,  1,  2>, < 3,  0,  2> },
>         { < 0,  0,  3>, < 1,  0,  3>, < 2,  0,  3>, < 3,  0,  3> }
>       },
>       {
>         { < 3,  0,  0>, < 4,  0,  0>, < 5,  0,  0>, < 6,  0,  0> },
>         { < 3,  0,  1>, < 4, -1,  1>, < 5, -1,  1>, < 6,  0,  1> },
>         { < 3,  0,  2>, < 4, -1,  2>, < 5, -1,  2>, < 6,  0,  2> },
>         { < 3,  0,  3>, < 4,  0,  3>, < 5,  0,  3>, < 6,  0,  3> }
>       }
>     },
>     {
>       {
>         { < 0,  0,  3>, < 1,  0,  3>, < 2,  0,  3>, < 3,  0,  3> },
>         { < 0,  0,  4>, < 1, -1,  4>, < 2, -1,  4>, < 3,  0,  4> },
>         { < 0,  0,  5>, < 1, -1,  5>, < 2, -1,  5>, < 3,  0,  5> },
>         { < 0,  0,  6>, < 1,  0,  6>, < 2,  0,  6>, < 3,  0,  6> }
>       },
>       {
>         { < 3,  0,  3>, < 4,  0,  3>, < 5,  0,  3>, < 6,  0,  3> },
>         { < 3,  0,  4>, < 4,  1,  4>, < 5,  1,  4>, < 6,  0,  4> },
>         { < 3,  0,  5>, < 4,  1,  5>, < 5,  1,  5>, < 6,  0,  5> },
>         { < 3,  0,  6>, < 4,  0,  6>, < 5,  0,  6>, < 6,  0,  6> }
>       }
>     }
>   }
>
>
>
> #declare PatchTextures =
>
>   array[PatchesInHeight][PatchesInWidth] {
>     {
>
>       texture {
>         pigment {
>           checker
>           color rgbf <1.0, 1.0, 1.0, 0.6>
>           color rgbf <0.0, 0.0, 0.0, 0.6>
>
>         }
>       },
>       texture {
>         pigment {
>           checker
>           color rgbf <0.7, 0.0, 0.0, 0.6>
>           color rgbf <1.0, 1.0, 1.0, 0.6>
>         }
>       }
>     },
>     {
>       texture {
>         pigment {
>           checker
>           color rgbf <0.0, 0.7, 0.0, 0.6>
>           color rgbf <1.0, 1.0, 1.0, 0.6>
>         }
>       },
>       texture {
>         pigment {
>           checker
>           color rgbf <1.0, 1.0, 1.0, 0.6>
>           color rgbf <0.0, 0.0, 0.7, 0.6>
>         }
>       }
>     }
>   }
>
> #declare CntH = 0;
> #while (CntH < PatchesInHeight)
>   #declare CntW = 0;
>   #while (CntW < PatchesInWidth)
>
>     bicubic_patch {
>       type 1
>       flatness 0.001
>       u_steps 4
>       v_steps 4
>       uv_vectors
>         <0, 0>
>         <1, 0>
>         <1, 1>
>         <0, 1>
>
>       #declare I = 0;
>       #while (I < 4)
>         #declare J = 0;
>         #while (J < 4)
>           PatchPoints[CntH][CntW][I][J]
>           #declare J = J + 1;
>         #end // while
>         #declare I = I + 1;
>       #end // while
>
>       uv_mapping
>         texture {
>           PatchTextures[CntH][CntW]
>           scale 1/3
>         }
>     }
>
>     #declare CntW = CntW + 1;
>   #end // while
>   #declare CntH = CntH + 1;
> #end // while
>
> // ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7
>
> background {
>   color rgb 0.5*<1, 1, 1>
> }
>
> camera {
>   location <3, 6, -3>
>   look_at <3, 0, 3>
> }
>
> light_source {
>   500*<1,  1, -1>
>   color rgb <1, 1, 1>
>   shadowless
> }
>
> // ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

That's great! Took me a while to understand the nested loops though.
Thank you very much.

The other reason I posted was to ask if there was a way to reduce the process of
creating the vectors for the patches to a while loop or nested loops.

Call me lazy, but I'm always looking for shorter/easier ways to do things. :)

D103

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