IK and NaN values in trc files

[Alice Mantoan]

Hi everyone,

I have a very quick question.

I remember that a few time ago, NaN values in .trc files were a problem for OpenSim (am I wrong?).
However, recently I heard that they are now "desirable" for the IK tool, as they make markers automatically not considered for the corresponding frames during the IK process. I would like to understand if this is true or not, because I expect it can be an important feature for the batch processing of multiple trials.

Thank a lot.

Regards,

Alice

[jimmy d]

Hi Alice,

NaN values can be used in the trc file for missing values. Marker frames with NaN values are excluded from the minimization.

hope that helps,
-james

[Alice Mantoan]

Hi James,

thanks a lot!!That's what I hoped to hear.
Perhaps I was wrong a couple of years ago.

Thanks again.

Alice