flying cube Using plain C arrays of coordinates, instead of Vertex Buffer Objects, confused some readers. I did it so that the very first tutorials would be simpler.

However, it also appears that plain C arrays are not supported at all starting with OpenGL 3.0. Plus, specifying offsets is done differently in each case, and people will use VBOs in the end for performances.

So the basic tutorials are now rewritten to use VBOs :) It took me longer than expected!