Looks great! Is the depth sorting inherent or manually specified? I notice that there is one Escher-esque shape (maybe this shape is defined as a whole then sorted?).
Both - but my depth sorting technique is incredibly naive.
"Shapes" consist of many "Paths" (paths = faces). If you draw a shape, it will attempt to order its faces. Instead, you can draw an array of paths in whatever order you'd like.
When drawing multiple shapes, the ordering is completely manual (unfortunately). This is currently my top priority.
