I would like to introduce a character by showing a round trip on a part of him to make like a gif. Anyway there's my problem/question :
How can I get the camera to go back and forth on the path ? like this :
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You can achieve this using the following steps:
With the two points being in the same place the camera turn will be very sudden, but I assume this is what you want, judging by your description.
To do it you can: