#include "colors.inc"

camera {

  location < 12.0, 12.0, 12.0>
  look_at <0.0,0.0,0.0>
  angle 40
  }

  background { color <0,0,0.10> }

  light_source { <20,20,20> White }
  #declare w=0.5;  // largura da "faixa"
  #declare a=0.75; // tamanho do "cubo-base"
  #declare k=8.0;
  #declare Node = bicubic_patch {
    type 1 flatness 0.01 u_steps 8 v_steps 8,
    <0,a,0> <-w/3,a,0> <-2*w/3,a,0> <-w,a,0>
    <0,a,k> <-w/3,a,k> <-2*w/3,a,k> <-w,a,k>
    <a,-k,0> <a,-k,-w/3> <a,-k,-2*w/3> <a,-k,-w>
    <a, 0,0> <a, 0,-w/3> <a, 0,-2*w/3> <a, 0,-w>
  }

  #declare SNode = union {
                          object { Node }
                          object { Node rotate 90*y rotate 90*x}
                          object { Node rotate 90*y rotate 90*x rotate 90*y rotate 90*x}
                          texture{
                                  pigment { color rgb <1.0,1.0,1.0> }
                                  }
                        }

object { SNode }
//object { SNode rotate <45,45,45> }