// Vertices 3D 
// by REAS <http://reas.com> 

float spin = PI/6;       // Rotation angle 
int circle_points = 6;   // Resolution of arcs 
int depth = 10; 
float size = 120.0; 
float thick = 50.0; 
 
void setup() 
{ 
  size(200, 200, P3D); 
  framerate(30); 
  background(0); 
} 
 
void draw() 
{ 
  noStroke(); 
  fill(0, 10); 
  rect(0, 0, width, height); 
  
  translate(width/2, height/2); 
  
  for(int i=0; i<depth; i++) { 
    stroke(255 - (i * 22.5)); 
    rotate(spin); 
    drawSpokes(-i*20); 
    pushMatrix(); 
    rotate(PI); 
    drawSpokes(-i*20); 
    popMatrix(); 
  } 
  
  spin += 0.002; 
  if(spin>PI) { 
    spin = 0; 
  } 
} 
 
void drawSpokes(float z_space) 
{ 
  beginShape(LINES); 
  for (int i=0; i<circle_points; i++) { 
    float angle = PI/2.0 * i/circle_points; 
    vertex(size*cos(angle), size*sin(angle), z_space); 
    vertex((size-thick)*cos(angle), (size-thick)*sin(angle), z_space);	 
  } 
  endShape(); 
}