Hi Christian,
Thanks for getting back to me. Vicon reports x-, y-, and z- coordinates in mm,
so in my “MotionTrackerInclude.any” file I have divided my Vicon include file by
1000, which should give me meters. For example, for each marker, I have a
similar line to:
AnyFolder p7 = { // RLEL
AnyVector time = {#include “Kinematics_time.any”}*1/120;
AnyMatrix p = {#include “RLEL_wrt_RSHO.any”}*1/1000;
#include “MarkerMoverWRTHubR.any”
//#include “MarkerMover.any”
};
I think my problem may occur in the JointsAndDrivers file where I have
positioned the pelvis in the environment.
AnyKinEqSimpleDriver SeatHeight = {
AnyKinLinear &PelvisPos = .PelvisPos;
DriverPos = {0,0,0};//{0.0,0.4448,0};
DriverVel = {0,0,0};
//Reaction.Type = {0,0,0};
Reaction.Type = {1,1,1};
};
This is incorrect and my pelvis should be located much higher, however I have no
markers on the pelvis so I’m not quite sure what the exact height should be.
Instead, I took out the above pelvis driver and tried to do the following (since
I am driving my markers with respect to my shoulder marker):
AnyKinLinear ShoulderPos = {
AnyFixedRefFrame &Ground = Main.MyValidation.EnvironmentModel.GlobalRef;
AnyRefNode &RSHO =
Main.MyValidation.HumanModel.Right.ShoulderArm.Seg.Humerus.gh;
};
AnyKinEqSimpleDriver ShoulderHeight = {
AnyKinLinear &ShoulderPos = .ShoulderPos;
DriverPos = {
-0.2580307,
1.497251,
0.2118869
};
DriverVel = {0,0,0};
Reaction.Type = {1,1,1};
};
The DriverPos is the marker placement location in space, however trying this
didn’t work either.
I hope I have helped to define my problem a little better. Any other
suggestions?
I appreciate your help,
Sarah
-----Original Message-----
> Date: Wed Nov 08 22:08:26 EST 2006
> From: “AnyBody Support” <support@anybodytech.com>
> Subject: [anyscript] Re: Simple arm-curl model
> To: anyscript@yahoogroups.com
>
> Hi Sarah
>
> I took a look at your model… you have enormous errors on your
> kinematics, thats why you get the kinematicTol error.
> I tried to put a KinematicTol=0.0001 into your study, but the errors i
> way larger than that… When I look at the files with the coordinates
> from the Wicon, it looks like they are in another unit than meters, I
> might think it has something todo with it? or am I wrong? then get
> back to me:D
> By the way KinematicTol should only be used to make the model run, so
> you can identify the problem.
>
> Best regards
> Christian, AnyBody Support
>
>
> — In anyscript@yahoogroups.com, “Sarah R. Sullivan” <sarsulli@…>
> wrote:
> >
> > Hi,
> >
> > I have run a simulation in which I collected Vicon motion data and EMG
> > data on a subject doing a bicep curl at a constant angular velocity.
> > I am now constructing 2 simple models. The first - a model that is
> > driven by the motion capture data, and the second - a model that is
> > driven by constant angular velocity input. Both models demonstrate an
> > individual curling 2.5 pounds. I am then going to compare the EMG
> > output to the AnyBody EMG output. As of now, I have the constant
> > angular velocity model working, however I am having a hard time
> > getting the Vicon motion data model to work (I have uploaded it to the
> > file section - it’s called Validation). Similar to the wheelchair
> > problem that I have worked on in the past, the lateral elbow, medial
> > and lateral wrist, and metacarpal are driven with respect to the
> > shoulder marker (as opposed to the hub marker). However, even with
> > the wheelchair template, I still can not get the model to run. It
> > compiles, however I can’t SetInitialConditions because the tolerances
> > are too large. Any suggestions?
> >
> > I appreciate your help,
> > Sarah
> >
>
>
>