Hi.
I’ve asked the same question in the past.
http://forum.anyscript.org/showthread.php?p=20743#post20743
In calculating the residual force, I think the pattern does not fit.
How I fix the model?
Thank you.
Hi,
I loaded the model from Mocap_LowerBody.main.any, but couldn’t see any force plates.
Have you followed the steps mentioned here? http://wiki.anyscript.org/images/2/2a/AddingGRFpredictiontoaMoCapmodel.pdf
Only then will the algorithm work. So you are probably getting high residuals because all the external forces are being carried by those residuals. 
Regards
Ananth
AnyBody Support
Thank you for answer.
I tried GRF prediction first.
Peak values of predicted GRF were somewhat consistent, but the patterns were observed differently.
So I tried to calculate the Residual Force using the code included in “GRFPrediction”, turning off the GRF prediction(GRFPrediction/GRF_example.any).
As a result, different patterns were observed for the calculations on the Anybody and the experiment result(included in the c3d file).
So, I want to know if there are any factors that cause the Residual Force pattern(or GRF pattern) to be miscalculated in the process of setting up the model.
Hi
The difference between measured GRF and predicted GRF can fundamentally arise from these sources:
[ol]
[li] Differences in kinematics between subject and model, so any measurement error will influence the results.
[/li][li] Differences in the mass distribution of the subject and the model will also influence the results. The larger the mass and the more acceleration it has the bigger the impact.
[/li][/ol]
Best regards
Søren