I want to double-check some of the principles as I had some concerns when I switched between different C3D files with different lab Global coordinates:
In the case of using the Mocap model With the generic global coordinates (X, Y, Z),
Are joint reactions always, by default exported in the Local Reference Frame of the join/segment?
For example, in the selected output:
These forces are based on the local coordinates of the joint (Thigh.HipJoint ref), correct?
Following the same SelectedOutput path, when it comes to muscle forces with components (F, F, F), it is written in the Global coordinates system, correct?
with (F, F, F) corresponds to X, Y, Z of the Global coordinates system.
If AnyOutputFile is used to export .txt of specific muscles force F,
the exported results of muscles and joints forces will be written by default (F, F, F) according to the Global reference ( X, Y, Z)?
If AnyMechOutputFileForceExport is used to export all results in .txt with "UseRefFrameOnOff = Off".
all the exported results of muscles and joint forces will be written by default in the Global Reference, correct?
Here the hip reactions will be in terms of F, F, F and follows the Global coordinates system, correct? rather than following the local referencing of
Hip_MediolateralForce > i.e it doesn't correspond to F or Fx in the Global Ref
However, if "UseRefFrameOnOff = On" and a reference segment is defined,
muscles and joint forces results will be written based on this local reference of the segment, correct?
In case of using a different C3d file with different Global coordinates orientation, all the exported results -based on the global coordinates- will follow the new global coordinates, correct?
i.e its F, F, F will corresponds to the new X. Y, Z of the new coordinates.
However, hip reactions in terms of
Are independent of the global coordinates, correct?