Some more 3D

• Hidden Surface Removal
  • This is the process whereby objects further away are obscured by closer objects.
  • This is principally done with the Z-buffer
  • To do this we need to do the following
    • ASK for a Z-buffer
      • glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
    • Enable depth testing
      • glEnable(GL_DEPTH_TEST);
  • We need to draw a 3d object as well.
  • And for anything real, we need to be able to move it about.
    • glTranslatef(x,y,z) will translate an object in space
    • glRotatef(angle, x,y,z) will rotate about the given axis by the given angle.
  • Much more on all of this later.