> .... > I've problem to find something that give that physical effect > ( like a spring). > > Any idea?
You may find VPython useful for simulating physical effects .... http://www.vpython.org/ Examples including a couple that are spring-related .... http://matterandinteractions.org/Content/Materials/programs1.html -- Stanley C. Kitching Human Being Phoenix, Arizona -- http://mail.python.org/mailman/listinfo/python-list