Search found 12 matches

by Peter Loan
Fri Aug 05, 2011 1:28 pm
Forum: OpenSim
Topic: Exporting SIMM files in OpenSIM
Replies: 3
Views: 792

RE: Exporting SIMM files in OpenSIM

<t>Hi Anantharaman,<br/> It sounds like you are using an old version of SIMM. Support for moving muscle points was added to version 5.0 last year. I tested the files exported by OpenSim 2.2.1 and they load OK into SIMM 5.0 as well as version 6.0, which was released last month and is available on the...
by Peter Loan
Fri Jul 30, 2010 10:01 am
Forum: OpenSim
Topic: Passive Force
Replies: 2
Views: 361

RE: Passive Force

<t>Hi Elizabeth,<br/> <br/> The differences in passive force are due to the different muscle models in OpenSim and SIMM. Here's the history:<br/> <br/> SIMM uses a natural cubic spline to represent the passive force-length<br/> behavior of muscle fibers. This spline is specified in the muscle file a...
by Peter Loan
Thu Jul 30, 2009 8:52 pm
Forum: OpenSim
Topic: ID and Static Optimization
Replies: 1
Views: 208

RE: ID and Static Optimization

<t>Hi Daniel,<br/> <br/> If I understand your two cases correctly, I would<br/> expect different ID moments for them. If your<br/> right leg model has no torso, etc., then I'd<br/> expect the ID moments to be incorrect (one reason<br/> being that the ground-reaction forces are from<br/> a full body)...
by Peter Loan
Thu Jul 30, 2009 8:39 pm
Forum: OpenSim
Topic: Subtalar Joint Axis Definition?
Replies: 1
Views: 224

RE: Subtalar Joint Axis Definition?

<r>Hi Paul,<br/> <br/> I checked the visual representation of the subtalar<br/> axis in SIMM on the same model, and it does indeed<br/> look like 38 deg inclination and 9 deviation. This<br/> model has the same joint axis definitions as the<br/> ones defined by Scott Delp for his dissertation<br/> m...
by Peter Loan
Thu Mar 19, 2009 8:10 pm
Forum: OpenSim
Topic: .anc to .mot Files
Replies: 2
Views: 486

RE: .anc to .mot Files

<t>Hi Pablo,<br/> <br/> I am just finishing up a utility program that will<br/> convert TRB and ANB files into the OpenSim format.<br/> It uses your existing forcepla.cal file to<br/> calibrate and convert forces from any force plates, and divide them into left and right sides.<br/> It will also con...
by Peter Loan
Fri Feb 13, 2009 11:45 am
Forum: OpenSim
Topic: I can't import Stanford VA upper limb model
Replies: 4
Views: 847

RE: I can't import Stanford VA upper limb model

<t>Hi Kai,<br/> <br/> I sent you a message through simtk.org regarding<br/> this, so that I can send you the converted model<br/> directly. Also, we will post converted OSIM versions<br/> of the wrist model and the upper extremity model<br/> to their respective project pages in the near<br/> future....
by Peter Loan
Thu Feb 05, 2009 1:59 pm
Forum: OpenSim
Topic: Imporing Model Fails
Replies: 1
Views: 192

RE: Imporing Model Fails

<t>Hi Amirrezq,<br/> <br/> This is a bug in v1.8 (the wrist model cannot be<br/> converted to an SD/FAST-based model, but it can<br/> be converted to a Simbody-based model, which is<br/> what OpenSim uses). This will be fixed in the next<br/> release. In the meantime, I will send you the<br/> proper...
by Peter Loan
Mon Feb 02, 2009 3:20 pm
Forum: OpenSim
Topic: joints and coordinates definition
Replies: 5
Views: 716

RE: joints and coordinates definition

<t>Hi Giordano,<br/> <br/> You should be able to adjust the <location> values<br/> in the CustomJoint to get the desired kinematics.<br/> The <location_in_parent> values specify the location<br/> of the joint center in the parent body's reference<br/> frame, and the <location> values specify the joi...
by Peter Loan
Fri Sep 12, 2008 8:11 am
Forum: OpenSim
Topic: Deformable femur model
Replies: 2
Views: 427

RE: Deformable femur model

<t>Dan,<br/> <br/> Deform objects (and constraint objects) are not<br/> currently supported in OpenSim. It's hard to say<br/> if/when they will be supported; there are not<br/> any plans to add them in the next 6-12 months,<br/> but that could change.<br/> <br/> You could use software such as Rhino ...
by Peter Loan
Fri Mar 21, 2008 9:06 am
Forum: OpenSim
Topic: Inverse Dynamics on Upper Limbs
Replies: 7
Views: 1371

RE: Inverse Dynamics on Upper Limbs

<t>Hi Istvan,<br/> <br/> As Ayman said, the upper extremity model is a<br/> complex one to start with. And I think that you'll<br/> need some source code that has not been released<br/> yet in order to run dynamic simulations on that<br/> model. But in any case, here's what to do when<br/> you get t...