A shadow for a three-dimensional model having an infrastructure that includes a bone is generated by projecting the bone onto a surface and generating the shadow on the surface based on a projection of the bone. Projecting the bone includes drawing lines from the virtual light source, through points...http://www.google.co.uk/patents/US6906724?utm_source=gb-gplus-sharePatent US6906724 - Generating a shadow for a three-dimensional model
