There was a generalisation of the eigenface technique to 3D published in Siggraph about 15 years ago. http://gravis.cs.unibas.ch/Sigg99.html http://gravis.cs.un

There was a generalisation of the eigenface technique to 3D published in Siggraph about 15 years ago. http://gravis.cs.unibas.ch/Sigg99.html http://gravis.cs.unibas.ch/Sigg99.html One of the authors is still working on refining their approach, by the looks of it: http://gravis.cs.unibas.ch/projects.html http://gravis.cs.unibas.ch/projects.html