> .... > 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
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