What interaction patterns? You mean the weird combine two profiles in one window :-) ? That is my idea. The sphere guided mesh generation is based on a paper: "

What interaction patterns? You mean the weird combine two profiles in one window :-) ? That is my idea. The sphere guided mesh generation is based on a paper: "B-Mesh: A Fast Modeling System for Base Meshes of 3D Articulated Shapes" Edit: I am not familiar with STL format, may have a look at it, thanks.