That's a really tough one. Is it possible to post a pic of the suspension setup?

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[Link to www.3dprevis.com]

here i hope these are of help if not maybe i could email them to you...

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Ah. That's pretty complicated. Don't think i can be much help here.

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[Link to www.3dprevis.com]

I dont know it very well, but try studying the "reactor"'s hinge constraint.....sounds like it could be the solution....

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Walking Teapot

Vehicle rigging fraks with my head every time, theres so many variables. the car needs to react to terrain but also move away from the ground etc when it jumps. its well hard.
you will be needing to venture into scripting in a serious way. that and expression controllers are very powerfull. I can do a set up where the cars suspension doesnt bottom out but I'm not sure about the floor stick setup. you want to be able to animate everything manually too, its a hard one for sure. send me a file and i will have a look at it and ask around if you want. tysontelliott@yahoo.com

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Yeh, thats why I use plugins where possible. Which it's not here.

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[Link to www.3dprevis.com]