I'm not sure.. It suggests indeed that you get rid of the control of the coordinates, but I can also imagine that it tries to match your control values, but it may deviate a little when necessary. So, actually I don't know. I'll think you should try and see what happens :) Maybe you can conclude fro...

Hi Dario, I'm not an expert in building OpenSim models, but maybe some things you could try.. I got some desginer tips from James, based on another forum topic: "slow simulations". In the end, these suggestions also solved my error tolerance problem. Maybe you can try to use the tag <is_free_to_sati...

My problem of the slow simulation is solved!! The problem was probably within the assemblySolver which could not solve the kinematics due to too many coordinates and constraints. James gave me two main design advices which solved my problem: 1. model the joints as gimbal, slider, pin or weld joints ...

Hi! Sorry for the late reply, but it took a while to find a computer which was faster than the one we used. Unfortunately, the issue wasn't solved running the model on a different machine. The simulation was still very slow! When we move the slider, in the coordinates window, back and forth on a cer...

Hi James, Thanks for your reply! Too bad that it is not just an easy fix. I'll have to find the problem somewhere else. I have some locked joints in my model and also some looped constraints (if you mean that some degrees of freedom are used both as independent and dependent value in a CoordinateCoo...

Hi, I have (hopefully) a simple question, does any one know how I can change the assembly tolerance in an opensim model? I think the geometry of my system is not precise enough to achieve an 1 e-9 m perfection. The error that I get is: "Assembly error tolerance achieved: 1.79835104405468e-007 requir...

Hi Sherm,

Thanks for your quick reply! It was very usefull. Creating a massless body solved my problem. (Or at least this part )

Regards,
Laura

Hi! Let me first give a situation overview of my problem. I have a body (a tube) which needs to be able to rotate in 3 dimensions (x, y and z) and it needs to be able to translate along the z axis (this is the direction in line with the tube). But this translation should be around the current (after...

Hi Xiaoqin and Michael,

Did anyone of you find a solution yet on your problem Xiaoqin? I'm having the same problem and I don't know what is going wrong and how I have to solve this.
"Assembly error tolerance achieved: 6.17791923304342e-12 required: 1e-009"

Thanks!

Hello, I would like to make a simplified canine knee model with the use of OpenSim. I've some programming skills, but I have never programmed in C++. So I would like to use a existing model (for example BothLeg, SeperateLeg or Leg6Dof9Musc) as a starting point. Does anyone know how I can get the sou...