Hello,
I am trying to make the knee joint axis of rotation dependant of C3D markers.
I have a problem with the RotMat Function, in the definition of ARel of the joint.
As told in the Reference manual, I must set 3 points or reference:
the origin: I took the average between the coordinates of a knee external and a knee internal markers (to have the center of the knee, dependant of my 2 markers).
the x axis: I took R/LKNE marker (but I think this marker is for z axis)
the y axis: I took the HipJointRight/Left TD
The results is not satisfying so I gess the error comes from the x axis is not correcty defined?
Sould I have an additional maker in the front of the knee for example to set correctly the x axis?
Is it possible to change the coordinates system of the joint, to make it rotate about the x axis (and keep the same movement)?
For now, I set the ARel propertie of the knee joint in the HumanModel folder, in order to separate Right en Left.
I use AMMRV1.4.
I joint the model I’m working with.
Thank you for helping,
Best regards,
Claude Pothrat