geometry (SecondFundamentalForm): use VertNormals instead of the (no longer present) VertNormalsScaled, and handle the case where "v" is numpy instead of chumpy.
geometry (SecondFundamentalForm): use VertNormals instead of the (no longer present) VertNormalsScaled, and handle the case where "v" is numpy instead of chumpy.

mattloper/opendr,mattloper/opendr,dimatura/opendr,dimatura/opendr