Wanted to simulate this tricky door by KLEMENS TORGGLER

http://www.torggler.co.at



After some numerous headaches! :)

With SKetchUp and the very excellent MSPhysics by Anton Synytsia





and the SKP :) http://moiscript.weebly.com/uploads/3/9/3/8/3938813/door_triangles.skp

https://www.rubydoc.info/github/AntonSynytsia/MSPhysics/file/RubyExtension/MSPhysics/README.md
doc online by Anton Synytsia, creator of MSPhysics!

not used for door above! ;)