Kathleen, what CAD-system do you use? I developed an extension for CREO (Pro/Engineer) that can convert open chain mechanisms to OpenSim multibody models. Please contact me if you want me to convert your assembly.
Daniel

Thanks Ayman,
I think I' ll just wait for the 4.0 release. Since I have some students working with my models It wouldn't make sense to let them work with a pre-release. So we stick with 3.2.
At least I know that my implementation is correct.
Regards,
Daniel

Hi all, I recently implemented a custom force model component and implemented the ModelComponent method "generateDecorations()" to visualize my force within the GUI. However the decorations only show up within the OpenSim visualizer. The GUI seems to ignore them. Is there an alternative way to equip...

Hi all, I am working on an inverse kinematics solution that accounts for static equilibrium conditions. The goal is to find system configurations q that a) satisfy several kinematic tasks (e.g. reaching for an object) b) allow the system to be in static equilibrium meaning that in mobility space all...

Ok, and here what I did with it so far: We are currently working on a project dealing with FEA simulations of human bones. Therefore we want to use force boundary conditions obtained from OpenSim models. This includes all muscle forces, joint reactions and constraint forces directly applied to a bod...

This is Sherm's reply: 1) The Constraint base class methods can only deal with features common to all constraints, but a "point of application" only makes sense for certain constraints. Some constraints act on joint axes rather than bodies (couplers), some apply pure torques to bodies (orientation c...

The following two questions on Simbodys kinematic constraints were originally discussed between Sherm an me. However since others might be interested as well, I start this new topic: 1) In Simbody a constraint provides the method Constraint:getConstraintForcesAsVectors() to obtain the corresponding ...

Hello Everyone, we created a software to record motion sequences to opensim using the kinect device. It is not as easy as one might think. Since the KINECT SDK only gives you the spatial orientations of limbs as a rotation matrix, you have to determine the joint angles by decomposing this matrix int...

Hey Sina,
there is a more direct way of transforming the coordinates from a local cos to the global "ground" cos.
Take a look at the method: model.getSimbodyEngine().transformPosition(..)
Best Regards,
Daniel

Hi everyone, my colleague and me were currently discussing about CMC simulations. Out of curiosity I created a model of a simple 1-DOF pendulum with a coordinate actuator assigned to the pivot. We simulated 0.5 seconds of free swinging motion using the forward dynamic tool. Free means no excitation ...