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In terms of position, this means that the specified target coordinates are not the end position of the “MultiServo Position Linear” node's attached bodies, but it is the total distance they cover. For more information, please read the "Physical Interaction of Bodies Linked by a MultiServo" subchapter under "MultiServos - Types".
Reaction time
As the name suggests, this is the time the MultiServo needs to react to a change of target: In other words: it is the time in seconds [s] that is needed to take a new target as a new objective. An example:
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