The geoface example in this directory is a modified version of the codepresented in Appendix 1 of Frederic I Parke and Keith Waters's mostinteresting book "Computer Facial Animation" (A.K. Peters, ISBN1-56881-014-8).  Information about the book can be found at:  http://www.research.digital.com/CRL/personal/waters/book.htmlFrom the book's Preface:  This book is about computer facial models, computer generated facial  images, and facial animation. In particular it concerns the  principles of creating face models and the manipulation or control of  computer generated facial attributes. In addition, various sections  in the book describe and explain the development of specific computer  facial animation techniques over the past twenty years, as well as  those expected in the near future.The original Appendix 1 code (using the aux library) can be found at:  http://www.research.digital.com/CRL/books/facebook/appendix1/appendix1.htmlI've improved the code to add menus, better mouse motion handling,arrow key support, and less terminal output.DEC has a program called DECface that looks even more involved:  http://www.research.digital.com/CRL/projects/DECface/DECface.htmlIf the example here intrigues you, you'll definitely want the book.- Mark Kilgard