# Joint-Driven Gait3D

Dear colleagues in AnyBody support:

I wish calculate the joint torque in Gait3D model. What I did is: (1)
run the Gait3D model by driving via the markers; (2) obtain the joint
angles in Ankle, Knee, and Hip; (3) run the model again by using the
joint drivers in Ankle, Knee, and Hip. If the Reaction.Type in the
driver is set “On”, the joint torque can be measured in this way.

I got my model run by driving Ankle and Knee joints. But, I cannot get
the hip joint driver working. Also, I found that the output ankle
flexion should be substracted by pi/2, and the output of knee flexion
should be timed by a minus for them to drive the model.

I have up-loaded my model in “JointDriven_Gait3D.zip”. Can you take a
look of my model? Or, do you have a better way to computer the joint
torqeu in Ankle, Knee, and Hip?

Thanks,

John

Dear colleagues:

I got my “joint-driven” model run. The problem has been
resolved. The model works by using the joint positions extracted from

John

— In anyscript@yahoogroups.com, “johnzengwu” <jwu@…> wrote:
>
> Dear colleagues in AnyBody support:
>
> I wish calculate the joint torque in Gait3D model. What I did is: (1)
> run the Gait3D model by driving via the markers; (2) obtain the joint
> angles in Ankle, Knee, and Hip; (3) run the model again by using the
> joint drivers in Ankle, Knee, and Hip. If the Reaction.Type in the
> driver is set “On”, the joint torque can be measured in this way.
>
> I got my model run by driving Ankle and Knee joints. But, I cannot get
> the hip joint driver working. Also, I found that the output ankle
> flexion should be substracted by pi/2, and the output of knee flexion
> should be timed by a minus for them to drive the model.
>
> I have up-loaded my model in “JointDriven_Gait3D.zip”. Can you take a
> look of my model? Or, do you have a better way to computer the joint
> torqeu in Ankle, Knee, and Hip?
>
> Thanks,
>
> John
>