I’m curious what marker-set is used from “FullBody.main” on the “Plug-in-gait-Simple” file.
a) Are values(degree, velocity, acceleration, force, moment) changed if I use different marker-set
compared to “FullBody.main”?
If I remove skull markers(RFHD, LFHD, RBHD, LBHD), it can’t run ‘Parameter Identification’.
a) If my model has no skull markers, how can I run ‘Parameter Identification’?
b) How can I remove the skull on “FullBody.main”?
You can enable a driver for the head by driving it to 0, assuming that the head does not move wrt to the thorax. Update Plug-in-gait_Simple\Setup\ExtraDrivers.any with these lines:
#define BM_MANNEQUIN_DRIVER_SKULL_THORAX_LATERALBENDING ON #define BM_MANNEQUIN_DRIVER_SKULL_THORAX_ROTATION ON #define BM_MANNEQUIN_DRIVER_SKULL_THORAX_FLEXION ON
It means we define motion (kinematic constraints) as not moving and staying at the “neutral” position (flexion/lateral bending/rotation of the neck and rotation of the head being 0 degrees). We do that by using default mannequin drivers - please go through the tutorials to catch up with the terminology. AMMR Documentation
Setting it to ON means we will enable default drivers and they will using values from the Mannequin file.
“Plug-in gait” is the name of the marker set/protocol as suggested by Vicon. I think our examples are consistent with this protocol or may have been a little adapted to produce better results.
You can see the marker placement scheme kindly provided by Lee, or download the official documentation from Vicon’s website for some extra information.