Okay, thank you for clarifying. Just to make it sure, using bushingforce or coordinatelimitforce won't be useful for closed-loop inverse kinematics? To be more specific, lets say I want to constrain a bike to a cyclist, but IK fails when I use the standard weld or point constraints. I would like to ...

Thank you both! It is clearer now. I had come across BushingForce, but not CoordinateLimitForce. I have not tested any of them, I guess it is going to be my next step! I can't find any mention of either of them in the Simbody manual, though. Also, I am curious: to my knowledge kinematics does not co...

Subsidiary question: Is it possible to assign weights to constraints, in the inverse kinematics tool for example?
I might be missing something, but I feel like it could make a hard constraint become soft?

Hello, I'm a little confused with OpenSim constraints, and I can't find an answer anywhere: - Does OpenSim handle soft constraints? - If not, what is the difference between a joint and a hard constraint? More specifically, between a weld joint and a weld constraint, or a point constraint and a ball ...

Dear all, I am currently reading this article , and I am quite puzzled with the amount of solutions there are to the kinematic problem. I am wondering which one of these OpenSim uses. - It is definitely a numerical approach, rather than analytical - There is no learning, so it is not a data-driven a...

Thank you, this is helpful!
I'll try it and get back to you as soon as possible (possibly not before next week, though)

Dear all, My problem is very similar to this issue , which hasn't been answered. I am trying to perform inverse kinematics on a model that fuses a human being and his bike. This person is standing out of the saddle, however hands and feet are in contact with the bike. In order to avoid creating a cl...

Hello,

The explorer in OpenSim is extremely slow on my computer. It takes minutes before I can open any file, which is quite annoying.
Note that it is completely fine on an other (less powerful) computer I sometimes use.

Has anyone experienced it? And even better, found a solution?
Thanks!

Hello, I'm allowing myself to ask again, since I haven't figured it out yet.

I have a body (namely {head+torso}, with defined inertia, mass center, mass) that I want to split into two parts ({head} and {torso}). I don't know how to calculate their respective inertia.

How would one do this?

Hello, A few questions about inertia and mass centers in OpenSim: 1- Where do you get mass centers and inertias for your OpenSim models? Do you just find them in anthropometric tables such as Zatsiorski 's, Leva 's, or Nikolova 's? I couldn't find the right references for the bones I was looking for...