   Great computer graphics applets
  I've recently stumbled across this link. Aside from the interesting lecture notes, the Demos section contains a lot of great applets that demonstrate fundamental concepts in computer graphics. For example, the scene-graphs applets demonstrate the effect of applying 3D transformations in a varying order, and you can interactively compose transformations and watch the results visually. You might also look at the relevant lecture notes for some further information.Beginners often find these concepts difficult to understand and visualize, so I'm sure this will help many of them. If you know of any similar sites, feel free to post them.   