Proceedings of the Third International Conference on Computer Graphics Theory and Applications Event: VISIGRAPP (VISAPP, GRAPP) Event held on: January 22-25, 2008, in Funchal, Madeira, Portugal Editors: José Braz 1 , Nuno Jardim Nunes 2 and João Madeiras Pereira 3 Affiliations: 1 Escola Superior de Tecnologia de Setúbal, Portugal , 2 University of Madeira, Portugal , 3 Instituto Superior Técnico, Portugal ISBN: 978-989-8111-20-3