Wow.... amazing . I'm very curious about how you make the hand-draw brush style, what tech do you use? Or did you plan open source your code?
Thank you.
Each model is made of simple shapes (prisms, cylinders etc.), which I know how to draw from different angles. Because not much concavity is involved, I can z-sort them easily and as a result no real 3D techniques are required, this all is just polygons. To make them look hand-draw I use several methods: I resample my polygons (most visibly in the Pencil mode), distort slightly (or not so slightly as in the Scribble mode), overlay multiple times (Sanguine). Also I use strokes of variable thickness (Ink brush). That's it more or less.