Initial Conditions Error

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1

Hello. I followed the AnyBody tutorial step by step to import my own C3D file for lower extremity analysis but I faced this error. I tried many thing but was not able to fix it and run the model. Could you please let me know what I am missing?

Progressing to solve kinematic optimality conditions and hard constraints.
Progressing to solve kinematic optimality conditions and hard constraints.
Progressing to solve kinematic optimality conditions and hard constraints.
Progressing to solve kinematic optimality conditions and hard constraints.
Failed to solve kinematic optimality conditions and hard constraints after 5 fallback attemps.
Constraint violations for study 'Main.Studies.ParameterIdentification.KinematicStudyForParameterIdentification' :
Constraint #1 is above tolerance 1e-05, error = 0.000013, constr. #1 in 'Main.HumanModel.BodyModel.Trunk.JointsLumbar.SacrumPelvisJnt.Constraints'.
Constraint #4 is above tolerance 1e-05, error = 0.000015, constr. #1 in 'Main.HumanModel.BodyModel.Trunk.JointsLumbar.L5SacrumJnt.Constraints'.
Constraint #5 is above tolerance 1e-05, error = 0.000051, constr. #2 in 'Main.HumanModel.BodyModel.Trunk.JointsLumbar.L5SacrumJnt.Constraints'.
Constraint #6 is above tolerance 1e-05, error = 0.000052, constr. #0 in 'Main.HumanModel.BodyModel.Trunk.JointsLumbar.L4L5Jnt.Constraints'.
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Constraint #247 is above tolerance 1e-05, error = 0.015229, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Patella'.
Plug-in-gait_Simple.zip (1.3 MB)

ERROR(OBJ.MCH.KIN3) : KinematicStudyForParameterIdentification.any(11) : KinematicStudyForParameterIdentification.InitialConditions : Kinematic analysis failed in time step 0 : Position analysis is not completed

2

Hi Mina,

Welcome to the AnyScript forum!

I had a look at your model and it seems that there was a mismatch between the units of the c3d file and the units expected by AnyBody. As a consequence, AnyBody displayed all the markers in a very small volume. This resulted in a very large error between the markers on the model and the c3d file causing the error.

You can fix this in simple steps.

You will find a file called C3DSettings.any in the Setup folder. Please open that file and change the PointsScaleFactor to 1 from 1/1000.

I hope this helps

Best regards
Dave

3

Hi Dave,

It was super helpful.
Thanks so much.

Mina

4

That's great! Thanks for the feedback :slight_smile:

Dave

5

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