How do the Locomotion System 'motion groups' work?

Unity Engine
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(I posted over at Unity Answers but got no response so far. How do the Locomotion System 'motion groups' work? - Questions & Answers - Unity Discussions)

The Locomotion System has the concept of ‘motion groups’ - but I can’t work out how to use them effectively.

  • The example in the docs tells you to create a single group called “locomotion” and it’s not clear why this name was chosen, rather than leaving it at the default of MotionGroup1. Is there something in the demo scripts that uses this hard-coded name?
  • If I create 2 motion groups and hit Initialise, the system seems to use one of the two groups. How do I know which one it’s going to use, and can this be changed at design time in the inspector?
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I commented over at UnityAnswers: How do the Locomotion System 'motion groups' work? - Questions & Answers - Unity Discussions