// Last edited on 2003-06-21 23:23:59 by stolfi
// MC930 - POV-Ray, Exercicio 11
// Fabio de Souza Azevedo - RA 952215
// Aula de 12/06/2003

#include "colors.inc"

// ===============================================================
// Retalho 1:

#declare A11 = <-9.0, +0.5, -5.0>;
#declare A12 = <-7.0, +1.0, -5.0>;
#declare A13 = <-5.0, +3.0, -5.0>;
#declare A14 = <-3.0, +3.7, -5.0>;

#declare A21 = <-9.0, +0.1, -5.0>;
#declare A22 = <-7.0, +1.0, -5.0> + 0.0001*z;
#declare A23 = <-5.0, +1.0, -5.0>;
#declare A24 = <-3.0, +1.0, -5.0>;

#declare A31 = <-9.0, -0.1, -5.0>;
#declare A32 = <-7.0, -1.0, -5.0>;
#declare A33 = <-5.0, -1.0, -5.0>;
#declare A34 = <-3.0, -1.0, -5.0>;

#declare A41 = <-9.0, -0.5, -5.0>;
#declare A42 = <-7.0, -1.0, -5.0> + 0.0001*z;
#declare A43 = <-5.0, -3.0, -5.0>;
#declare A44 = <-3.0, -3.7, -5.0>;

// ===============================================================
// Retalho 2:

#declare B11 = A14; // <-3.0, +3.0, -5.0>;
#declare B12 = <-1.5, +4.2, -5.0>;
#declare B13 = <+2.0, +4.0, -5.0>;
#declare B14 = <+4.5, +3.0, -5.0>;

#declare B21 = A24; // <-3.0, +1.0, -5.0>;
#declare B22 = <-1.5, +1.0, -5.0>;
#declare B23 = <+2.0, +1.0, -5.0>;
#declare B24 = <+4.5, +1.0, -5.0>;

#declare B31 = A34; // <-3.0, -1.0, -5.0>;
#declare B32 = <-1.5, -1.0, -5.0>;
#declare B33 = <+2.0, -1.0, -5.0>;
#declare B34 = <+4.5, -1.0, -5.0>;

#declare B41 = A44; // <-3.0, -3.0, -5.0>;
#declare B42 = <-1.5, -4.2, -5.0>;
#declare B43 = <+2.0, -4.0, -5.0>;
#declare B44 = <+4.5, -3.0, -5.0>;

// ===============================================================
// Retalho 3

#declare C11 = B14; // <+3.0, +3.0, -5.0>;
#declare C12 = <+3.0, +3.0, -5.0>;
#declare C13 = <+4.0, +3.0, -5.0>;
#declare C14 = <+5.0, +3.0, -5.0>;

#declare C21 = B24; // <+3.0, +1.0, -5.0>;
#declare C22 = <+3.0, +1.0, -5.0>;
#declare C23 = <+4.0, +1.0, -5.0>;
#declare C24 = <+5.0, +1.0, -5.0>;

#declare C31 = B34; // <+3.0, -1.0, -5.0>;
#declare C32 = <+3.0, -1.0, -5.0>;
#declare C33 = <+4.0, -1.0, -5.0>;
#declare C34 = <+5.0, -1.0, -5.0>;

#declare C41 = B44; // <+3.0, -3.0, -5.0>;
#declare C42 = <+3.0, -3.0, -5.0>;
#declare C43 = <+4.0, -3.0, -5.0>;
#declare C44 = <+5.0, -3.0, -5.0>;

#declare bz_scale = 0.35;
#include "../../bz-things.inc"

#declare retalho1 =
  union{
    bicubic_patch {
      type 1
      flatness 0.0 // 0.01
      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 retalho2 =
  union{
    bicubic_patch {
      type 1
      flatness 0.0 // 0.01
      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 retalho3 =
  union{
    bicubic_patch {
      type 1
      flatness 0.0 // 0.01
      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 exemplo =
  bicubic_patch {
    type 0
    flatness 0.01
    u_steps 4
    v_steps 4
    <0, 0, 2>, <1, 0, 0>, <2, 0, 0>, <3, 0,-2>,
    <0, 1  0>, <1, 1, 0>, <2, 1, 0>, <3, 1, 0>,
    <0, 2, 0>, <1, 2, 0>, <2, 2, 0>, <3, 2, 0>,
    <0, 3, 2>, <1, 3, 0>, <2, 3, 0>, <3, 3, -2>
  }

// Aqui está a cena, finalmente:

#declare scene =
  union{
    union{
      object { retalho1 }
      object { retalho2 }
      object { retalho3 }
      translate < 1.5, 0.0, 5.0 >
    }
    // object{ bz_axes }
  }

object{ bz_checker_bg }
object{ scene translate bz_rite_pos }
object{ scene rotate -90*y translate bz_left_pos }