Hi James,

re:
> If you apply extrude to attached polyhedron (regardless whether separated or not) the
> extrusions does not conform to face normals, instead they unidirectional.

It's because the surfaces are not planar. They are degree 1 surfaces with 4 corner points but the 4 points are not all on one plane.

You could do something like evaluate a surface normal at the middle of parameter space and use that as the extrusion direction, but the regular Extrude command will only extrude each piece along a separate individual direction if the piece that's being extruded is planar.

- Michael