Does (or could) the stencil buffer work on Wii? We're exploring
terrain-masked shadows, similar to those used in World of Goo:
http://upload.wikimedia.org/wikipedia/en/9/99/WorldOfGooBuilding.jpg
(Look closely around the goo balls, they have shadows that appear over
the terrain, not the sky. I think we could do this easily with the
stencil buffer.)
-Jacob