Lower limb model scaling

Main Forum
1

Hello,
I made the lower limb gait model with Leg3D and sequence
for optimizing bone geometry and marker place through iterative macro.
I use CreatMarkerClass.any and OptimizeAnthropometricsOnOff.any in Mocap
of ToolBox, and Run the ‘RunMotionAndParameterOptimizationSequence’
Operation was completed, but the result is so curious.
Pelvis length is very long and femur is so short.
I want to resolve this problem in my model
This net address is lower limb model in my cloud stroage
https://files.ucloud.com/pf/D497082_6830739_19559
Please debug my model and give me a advice, thank you

2

Hi,

The problem is that the pelvis is scaled in the wrong direction (Y upward instead of Z lateral). In the file ScalingLengthMass.any change the geometrical scaling of the pelvis to be like this:

AnyFolder Pelvis = {
AnyVar LengthScale = …AnthroSegmentLengths.PelvisWidth / …StandardParameters.Pelvis.Width;
AnyVar ms = …MassScaling.Pelvis.MassScale;
AnyVar ls = LengthScale;
AnyFunTransform3DLin ScaleFunction = {
ScaleMat = {{(.ms/.ls)^0.5, 0, 0},{0, (.ms/.ls)^0.5, 0},{0, 0, .ls}};
Offset = {0, 0, 0};
};
};

Best regards, Sylvain.