//sketch_3D_Z_SqPipe角パイプ
void setup()
{
  size(400, 400, P3D);
}

void draw()
{
  background(255, 255, 255);
  lights();
  ortho(-width/2, width/2, -height/2, height/2); // Same as ortho()
  translate(width / 2, height / 2);
  rotateY(map(mouseX, 0, width, -PI/1, PI/1));
  rotateX(map(mouseY, 0, height, PI/1, -PI/1));
  //noStroke();
  strokeWeight(0.5);
    
  fill(255, 255, 255);
  scale(1, 1,1);
  
  Z_SqPipe(50,44,100);//角パイプ
}

void Z_SqPipe(float Wo,float Wi,float L)//角パイプ
{
  float Ro=Wo/sqrt(2);
  float Ri=Wi/sqrt(2);
  
  pushMatrix();
  rotateZ(45*PI/180);
  Z_SqCylinder(Ro,L);
  Z_SqCylinder(Ri,L);
  translate(0,0,-L/2);
  Z_SqRing_2D(Ro,Ri);
  translate(0,0,L);
  Z_SqRing_2D(Ro,Ri);
  popMatrix();
}

void Z_SqCylinder(float r,float L)//角筒
{
  int sides=4;//分割数
  int i;
  beginShape(QUAD_STRIP);
  for (i = 0; i < sides + 1; ++i)
  {
    float angle = i*TWO_PI/sides;
    vertex(r*cos(angle), r*sin(angle), -L/2);
    vertex(r*cos(angle), r*sin(angle), L/2);
  }
  endShape(CLOSE);
}

void Z_SqRing_2D(float Ro,float Ri)
{
  int sides=4;//分割数
  int i;
  beginShape();
  for (i = 0; i < sides + 1; ++i)
  {
    float angle = i*TWO_PI/sides;
    vertex(Ro*cos(angle), Ro*sin(angle),0);
  }
  beginContour();
  for (i = 0; i < sides + 1; ++i)
  {
    float angle = -i*TWO_PI/sides;
    vertex(Ri*cos(angle), Ri*sin(angle),0);
  }
  endContour();

  endShape(CLOSE);
}