#include "colors.inc"

//#declare est_planeta = "earth-land.png";
//#declare fundo = "hubble-Sag-s5_l.jpg";    
//sky_sphere{ pigment {image_map { jpeg fundo}}}                 

#declare r = 10;

#declare A11 = <-r,0,0>;
#declare A12 = <-r+.0001,0,0>;
#declare A13 = <-r+.00001,0,0>;
#declare A14 = <-r,0,0>;
#declare A21 = <-r,-r,0>;
#declare A22 = <-r,-r,r>;
#declare A23 = <-r,-r,r+.00001>;
#declare A24 = <-r,0,r>;
#declare A31 = <r,-r,0>;
#declare A32 = <r,-r,r>;
#declare A33 = <r,-r,r+.00001>;
#declare A34 = <r,0,r>;
#declare A41 = <r,0,0>;
#declare A42 = <r+.0001,0,0>;
#declare A43 = <r+.00001,0,0>;
#declare A44 = <r,0,0>;

#declare B11 = A11;
#declare B12 = A12;
#declare B13 = A13;
#declare B14 = A14;
#declare B21 = <-r,r,0>;
#declare B22 = <-r,r,r>;
#declare B23 = <-r,0,r+.00001>;
#declare B24 = A24;
#declare B31 = <r,r,0>;
#declare B32 = <r,r,r>;
#declare B33 = <r,r,r+.00001>;
#declare B34 = A34;
#declare B41 = A41;
#declare B42 = A42;
#declare B43 = A43;
#declare B44 = A44;

#declare C11 = A11;
#declare C12 = A12;
#declare C13 = A13;
#declare C14 = A14;
#declare C21 = A21;
#declare C22 = <-r,-r,-r>;
#declare C23 = <-r,-r,-r+0.00001>;
#declare C24 = <-r,0,-r>;
#declare C31 = A31;
#declare C32 = <r,-r,r>;
#declare C33 = <r,-r,-r+0.00001>;
#declare C34 = <r,0,-r>;
#declare C41 = A41;
#declare C42 = A42;
#declare C43 = A43;
#declare C44 = A44;

#declare D11 = A11;
#declare D12 = A12;
#declare D13 = A13;
#declare D14 = A14;
#declare D21 = <-r,r,0>;
#declare D22 = <-r,r,-r>;
#declare D23 = <-r,r,-r+.00001>;
#declare D24 = <-r,0,-r>;
#declare D31 = <r,r,0>;
#declare D32 = <r,r,-r>;
#declare D33 = <r,r,-r+.00001>;
#declare D34 = <r,0,-r>;
#declare D41 = A41;
#declare D42 = A42;
#declare D43 = A43;
#declare D44 = A44;

#declare bz_scale = 0.9;
#include "bz-things.inc"

#declare retalhoA = 
union{
  bicubic_patch{
	type 1 flatness 0.001
   	u_steps 4 v_steps 4 
	A11, A12, A13, A14 
	A21, A22, A23, A24
	A31, A32, A33, A34 
	A41, A42, A43, A44 
   	texture { bz_tx_A }
  }
  object{ bz_grid_A }
}

#declare retalhoB =
  union{
    bicubic_patch {
        type 0 flatness 0.03
        u_steps 4 v_steps 4
        B11, B12, B13, B14,
        B21, B22, B23, B24,
        B31, B32, B33, B34,
        B41, B42, B43, B44
        texture { bz_tx_B }
      }
    object { bz_grid_B }
  }

#declare retalhoC =
  union{
    bicubic_patch {
        type 0 flatness 0.03
        u_steps 4  v_steps 4
        C11, C12, C13, C14,
        C21, C22, C23, C24,
        C31, C32, C33, C34,
        C41, C42, C43, C44
        texture { bz_tx_C }
      }
    object { bz_grid_C }
  }
  
#declare retalhoD =
  union{
    bicubic_patch {
        type 0 flatness 0.03
        u_steps 4  v_steps 4
        D11, D12, D13, D14,
        D21, D22, D23, D24,
        D31, D32, D33, D34,
        D41, D42, D43, D44
        texture { bz_tx_D }
      }
    object { bz_grid_C }
  }  
  
union{
  object {retalhoA}
  object {retalhoB}
  object {retalhoC}
  object {retalhoD}
  rotate 45*y
}
object{ bz_checker_bg } //background