//sketch_3D_Z_Parasol
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(2,2,2);
  //void Z_Parasol(int Sn,float R,float A)//パラソル面
  Z_Parasol(4,72.5,60);//パラソル面
}

void Z_Parasol(int Sn,float R,float A)//パラソル面
{
  int Pn=17;//ポイント数
  float[][] X=new float[Sn+1][Pn];
  float[][] Y=new float[Sn+1][Pn];
  float[] Z=new float[Sn+1];
  int i,j;
  for(j=0;j<=Sn;j++)
  {
    float Aj=j*A*PI/(180*(Sn-1));
    Z[j]=R*cos(Aj);
    float Ry=R*sin(Aj);
    for(i=0;i<Pn;i++)
    {
      float Ai = i*TWO_PI/(Pn-1);
      X[j][i]=Ry*cos(Ai);
      Y[j][i]=Ry*sin(Ai);
    }
  }
  //void Z_Side_M(int Sn,int Pn,float X[][],float Y[][],float Z[])//多段側面
  Z_Side_M(Sn,Pn,X,Y,Z); 
}

void Z_Side_M(int Sn,int Pn,float X[][],float Y[][],float Z[])//多段側面
{
  int i,j;
  for(j=0;j<Sn-1;j++)
  {
    beginShape(QUAD_STRIP);
    for (i = 0; i < Pn; i++)
    {
      vertex(X[j][i],Y[j][i], Z[j]);
      vertex(X[j+1][i],Y[j+1][i], Z[j+1]);
    }
    endShape(CLOSE);
  }
}