Hi, I obseve that the new OpenSim 4.2 GUI considers an unregistered object as an error that aborts loading a model (.osim) file that contains that object. This is not the case for OpenSim 4.0 where one is only given a warning of the form: Object::newInstanceOfType(): object type 'MyController' is no...

I got around the problem using the States Table facility of OpenSim API. Thanks.

I want to use the state vector at the end of a simulation to be the starting vector of a new simulation after making some changes to the model and calling initSystem. I am working in C++ API. I need guidance on the following questions: 1. How do I save the state vector at the end of a simulation? 2....

Thanks Chris. Below is the snippet of code immediately the model is fully defined: // Define the integrator and its options SimTK::RungeKuttaMersonIntegrator integrator(osimModel.getMultibodySystem()); initialTime = 0.0; finalTime = 1.0; stepSize = 0.1; TINY_TIME = 1.0e-6; Manager manager(osimModel)...

Hi, My model has several degrees of freedom and I prescribed one of the generalized coordinates and saved the model. The section of the model file displaying information on that coordinate is shown below: <coordinates> <Coordinate name="walkerToGround_coord_0"> <!--The value of this coordinate befor...

Excellent! Thank you Sherm.

Thanks Sherm. Could you provide us any hints on how to proceed in SimBody - anything similar to the sdfulltrq() function in SDFAST that has been defined in SimBody? Thanks.
Musa

I am wondering if anyone can help us out with solving inverse dynamics (ID) problem in systems with closed kinematic chains. A good way to solve the problem is to prescribe a number of generalized coordinates that equal the number of free degrees-of-freedom of the system. The advantage of doing this...

Hi, I am trying to change the parameters of some objects in my model during integration of the equations. Following is a snippet of the code I am using. After time t=1, I change the properties of HuntCrossley force and then re-initialize the model so the new values assume after that. snippet.cpp My ...

Does OpenSim GUI have a way to display the force vector (arrow) of an arbitrary force applied on a segment as was the case in SIMM?