• Next we perform clipping of the scene's objects againist a three dimensional viewing volume called a viewing frustum
  
  
• This step totally eliminates any objects (and pieces of objects) that are not visible in the image
  
  
• A clever trick is used to straighten out the viewing frustum in to a cube
  
  
• Next the objects are projected into two-dimensions
  
  
• Transformation from eye space to screen space