<t>Hi, Jean-Philippe. Sorry for the delay -- it's grant-writing season here.<br/> <br/> The problem is that you are using the ConstantAngle constraint outside its usable range -- it cannot be used efficiently at angles very close to 0 or +/-180, and you have it set to -Pi. The reason is that this is...

Since this is a new topic I'm moving it to a new thread entitled "Limiting joint motion" -- please see that thread for a response.

Sherm

<t>Hi, Jean-Philippe.<br/> <br/> The best way to limit the motion of a joint is the way it's done in nature -- with forces! Think about how the limited motion is enforced physically and write a Custom Force that resists motion beyond the limit (I believe you can find Custom Force examples in the tut...

<t>(Moved from another thread)<br/> BY: Jean-Philippe Jodoin (jpjodoin)<br/> DATE: 2009-09-18 09:54<br/> SUBJECT: RE: Constraint Missing implementation<br/> <br/> I was wondering, what would be the best to set a range to a mobilizer ? For example, I have a MobilizerBody::Ball that I only want to mov...

Hi, Jean-Philippe. It looks as though you mistakenly declared the variable Plane to be a "function of no arguments returning Halfspace" -- that is how I think the compiler will interpret the "()". That would explain the error message you got. Regards, Sherm

<t>Hi, Jean-Philippe. <br/> <br/> Yes, you are right. Those specialized reaction force methods are more an expression of good intentions than actual code at the moment!<br/> <br/> None of the specialized reaction force methods for either mobilizers (MobilizedBody) or Constraints are implemented yet ...

<t>Hi, Akila. A few thoughts:<br/> - are you on Linux or Mac? Mac uses a different environment variable name for the library path.<br/> - I am confused about the specific error you're getting. Do you mean literally "-lOpenMM"? That string would appear at link time rather than run time.<br/> - Have y...

<t>Thanks, Rob.<br/> <br/> The available inverse dynamics routines in 1.6 are methods of SimbodyMatterSubsystem that provide related operations. The main one is succinctly named calcResidualForceIgnoringConstraints(). That lets you apply forces and accelerations and returns the additional mobility f...

<t>Hi, Rob.<br/> <br/> Simbody 1.6 has inverse dynamics built in. That is done and there is a source branch for it, but we haven't had time yet to build and post the binaries. If you can build from source, you can get it now.<br/> <br/> Otherwise there are several alternatives you can use in Simbody...

<t>In that case it sounds as though the example is not finding any library, even the basic OpenMM library containing the Reference platform. Depending what OS you're running, you either need to set the PATH (Windows) or LD_LIBRARY_PATH (Linux) or DYLD_LIBRARY_PATH (Mac). Please see Section 4 of the ...