Hello,

I need to model the following situation, but I am not sure if this is 
possible with the built-in classes. Let's suppose we have two rigid bodies 
"A" and "B". "A" can move freely along the world x-axis via a prismatic 
joint, let's call this displacement "x". I want to constrain the rotation 
of B to be a function of this displacement, which requires 3 constraint 
equations of the form "c(x)=0". If this would depend on time, then the 
motion could be imposed, but that's not the case, since body "A" can move 
freely along the x-axis.

Is there a way to achieve this? Of course, a controller could be 
implemented, but I need to preserve the energy here, so I think it is only 
possible via analytical constraints.

Thanks a lot in advance.

Simone

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