Unable to perform Horizontal Adduction and Horizontal abduction in shoulder

[James]

Hi,

I am using the freeposture model to visualize various movements in the arm.
I am trying out various movements in the arm. I am not able to perform the horizontal shoulder abduction/adduction in the free posture model.
The following are the three different values that we are allowed to input in the mannequin folder with respect to shoulder.
AnyVector GlenohumeralFlexion =0.5*{0,0,0,0,0,0,0,0,0,0,0};
AnyVector GlenohumeralAbduction ={0,0,0,0,0,0,0,45,45,45,45};
AnyVector GlenohumeralExternalRotation ={0,0,0,0,0,0,20,20,20,20,20};
I tried various combinations of angles in these three inputs. But, i am not able to get the horizontal adduction/abduction in the shoulder. I am only able to do flexion and abduction separately.
To illustrate what movement i am talking about, i am attaching the link that visualizes this motion.

Please let me know how to attain this motion in the free posture move model.

Thank you,
James.

[pgalibarov]

Hi James,

Use this piece of code:

AnyVector GlenohumeralFlexionVec =45 + {10,30,50,70,89.5}; // from 45 degrees to ~135
AnyVector GlenohumeralAbductionVec =89.5 + 0*{ 10,30,50,70,90} ;
AnyVector GlenohumeralExternalRotationVec =0*{10,30,50,70,90};

The problem here is that you operate very close to the Gimbal lock configuration:
Gimbal Lock

Kind regards,
Pavel