I know this is a relatively old topic, but does anyone have any source examples of good ways to do vector-based graphics with hiarchy of parts? I tried to do it and am having much trouble. I know I could just continue using sprites or do a 3d sidescroller, but I really liked the style of OotW and I am interested in creating a similar polygon game engine that can be used to make other games sort-of on the fly. By the way, the end of HotA broke my heart. I almost cried. :(