Replay a motion in a given location, or with a transform constraint
These behaviors target different use cases and users are sometimes
confused about which one they should use.
Here is a quick overview about when and why one behavior should be
preferred to others depending on the use case.
Motion Behavior
Use it:
When playing a static motion (e.g. spectators sit in a stadium)
When the motion should be controlling the character position without
constraints (i.e. the particle is not controlled by GoTo/Navigation
Behavior or Maya field and you do not want to ensure any constraint on
the character position/orientation)
Getting variety in a stadium using Motion Behaviors. See Stadium Behaviors
Do not use it:
if you use a Motion Behavior on top of a GoTo/Navigation behavior, (at
least with default settings) the translation from this motion will be
added on top the translation from GoTo behavior, resulting in
characters colliding with each others or with obstacles. See
Locomotion.
if you want a row of characters to simply walk forward, but need to
randomize motion start time. If you just use a Motion behavior for
this, their orientation when starting can be different and they will
end up colliding. Use a SyncMotion Behavior or a Locomotion Behavior
instead.
Result of applying a Motion behavior with random start percent between 0
and 1, see the right solution below
Locomotion Behavior
Use it:
When you need a complex blending of motions depending on characters
speed/orientation (typically a character walking or a bird flying)
When controlling the character position with another behavior
(GoTo/Navigation) or method (Maya fields, particle goals...)
The usual Locomotion + GoTo/Navigation behaviors setup, see Populating City Streets for more details
(even with only one motion) To precisely follow a trajectory
Do not use it:
if nothing else is controlling the character position (at least with
default settings, if the particle do not move, the Locomotion Behavior
will only play the rest motion)
SyncMotion Behavior
Use it:
To control the position/orientation (all or only part of it) where a
motion will be played