Correspondence to Dr Sylvia Czuppon, Program in Physical Therapy, Washington University School of Medicine, 4444 Forest Park Ave, Campus Box 8502, St Louis, Missouri 63108, USA; czuppons{at}wustl.edu ...

This file provides functions and modules that construct shapes from a list of cross sections. In the case of skin() you specify each cross sectional shape yourself, and the number of points can vary.