The Nintendo DS has a GPU with a 3D engine that supports a surprising amount of features. Normally it can only be used to display 3D graphics on one screen, but it is possible to display 3D on both screens by using a special video capture circuit.

This technique isn't …

Well... I just looked at the code this morning and saw that the code looked horrible... So I just reorganised it a bit (included the code of examples), added a few "static" keywords and fixed a few warnings related to new versions of libnds and devkitARM. Nothing else, though. Everything …