http://www.cgrg.ohio-state.edu
http://accad.osu.edu/~pgerstma/protolib/index.html
dont a clock !
http://accad.osu.edu/~pgerstma/protolib/index.html?node=ClockMechanism
http://accad.osu.edu/~pgerstma/protolib/ClockMechanism/ClockMechanismExample.wrl
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http://mixed3d.net/