I made a 3D character with Bezier splines and surface of revolution.
     Because human body is more complicated than the shapes I've created so far, I first made up a simple and highly symmetric character and drew it on paper. Then I used the pen tool in Adobe Illustrator to trace some segments of the contour in my drawing that I can use to create the 3D mesh by rotating it. The selected paths are in the end of (see path.txt)
     The character is supposed to look like the below image (or schema.svg). It would look much more realistic if I use another spline to make the radius change over u. But this would require a 3D model, which is hard for me to create.