//Icosahedron created by Koo-Chul Lee (Sept. 17 2005)
float xmag, ymag = 0; 
float newXmag, newYmag = 0; 
float faces[][][]= new float [20][3][3];
 
void setup() 
{ 
  size(300, 300, P3D); 
  noStroke(); 
  colorMode(HSB, 100); 
  	float aNum = 0.5*(sqrt(5)+1);
	float verts[][] = {{0,  -aNum,  1}, {aNum, 1,  0}, {aNum, -1,  0}, {1, 0, -aNum}, {-1, 0, -aNum}, {-aNum, 1,  0},
                         {-aNum, -1,  0}, {-1, 0, aNum}, {1, 0, aNum}, {0, aNum,1}, {0, aNum, -1}, {0, -aNum, -1}};
   	int vertsIndex[][] =  {{0, 11, 2}, {0, 2, 8}, {0, 8, 7}, {0, 7, 6}, {0, 6, 11}, {1, 2, 3}, {1, 8, 2},
                               {1, 9, 8}, {8, 9, 7}, {7, 9, 5}, {7, 5, 6}, {4, 6, 5}, {4, 11, 6}, {4, 3, 11}, 
                                     {2, 11, 3}, {10, 1, 3}, {10, 9, 1}, {10, 5, 9}, {10, 4, 5}, {10, 3, 4}};
       for (int i = 0; i<20; i ++)
	    for (int j = 0; j <3;  j++)
	        for (int k =0; k<3; k++)
		      faces[i][j][k] =  verts[vertsIndex[i][j]][k];
     } 
     
void draw() 
{ 
  background(0,0,0); 
  pushMatrix(); 
  translate(width/2, height/2, -30); 
  
  newXmag = mouseX/float(width) * TWO_PI; 
  newYmag = mouseY/float(height) * TWO_PI; 
  
  float diff = xmag-newXmag; 
  if (abs(diff) >  0.01) { xmag -= diff/4.0; } 
  
  diff = ymag-newYmag; 
  if (abs(diff) >  0.01) { ymag -= diff/4.0; } 
  
  rotateX(-ymag); 
  rotateY(-xmag); 
  
  scale(50); 
  beginShape(TRIANGLES); 
    for (int i = 0; i<20; i++)
     {
         fill( (27*i)%100, 90,100);
         vertex(faces[i][0][0],faces[i][0][1], faces[i][0][2]);
         vertex(faces[i][1][0],faces[i][1][1], faces[i][1][2]);
         vertex(faces[i][2][0],faces[i][2][1], faces[i][2][2]);
     }
  endShape(); 
  popMatrix(); 
}