Hello!
I see that the groups have their own stiffness and damping attributes (both for rotation and translation) but I can’t figure out very well how they seem to work in relation to the values of each marker inside a group.
Where could I find more information about this topic?
Thank you! 
Hello hello!
They multiply the values on each contained Marker.
- Marker.stiffness = 0.5
- Group.stiffness = 2.0
Then the final stiffness will be 2.0 x 0.5 = 1.0. The same applies to damping.
Your best bet is to experiment.
- Load a default asset, like the Manikin
- Edit the group stiffness, and watch the whole character be affected
- Edit the stiffness on any marker, and watch only that marker be affected
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