CPSC 314 (Jan 2006)

Theory (PDF)
Coding (web page)
Solutions

Frequently asked questions

• Note: For the tapered cylinder, you should be building this by yourself using your own vertices. I suggest first generating and storing your own vertices in an array.

  For example, to generate a cylinder, you could do something like the following:

  nslices = 12;
  dth = 360/nslices;    // work with 30 degree slices
  float topVertex[nslices][3];
  float botVertex[nslices][3];
  
    // compute vertices
  for (n=0; n!=nslices; n++) {
    theta = n*dth;
      // vertices defining bottom ring
    botVertex[n][0] = radius*cos(theta);
    botVertex[n][1] = 0;
    botVertex[n][2] = radius*sin(theta);
     // vertices defining top ring
    topVertex[n][0] = radius*cos(theta);
    topVertex[n][1] = 0;
    topVertex[n][2] = radius*sin(theta);
  }
  
    // draw using these vertices
  for (n=0; n!=nslices; n++) {
    n2 = (n+1) % nslices;   // next vertex (with wrap-around)
    glBegin(GL_LINE_LOOP);
    glVertex3fv( botVertex[n] );
    glVertex3fv( botVertex[n2] );
    glVertex3fv( topVertex[n2] );
    glVertex3fv( topVertex[n] );
    glEnd();
  }