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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 :

enter image description here

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You can achieve this using the following steps:

  1. Create a path with the desired shape
  2. Switch to Edit Mode, select all control points and duplicate them Shift + D and unselect all
  3. Border select the point were the Camera is supposed to turn around
  4. Create a segment between the two select control points by pressing F
  5. Add a Follow Path modifier to the camera, tick the Follow Curve checkbox
  6. Press the Animate Path button in the modifier

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.

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  • $\begingroup$ Thank you also for your answer, the result isn't really what I want but it's a technique $\endgroup$
    – Prim
    Jun 14 '19 at 13:20
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To do it you can:

  • Put your camera on the center of the scene, give it a Follow Path constraint with the bezier curve as Target. Press the Animate Path button. In Edit mode, make sure that the curve goes in the right direction, if not press W > Switch Direction.

enter image description here

  • The Animate Path has automatically generated an animation along the curve but you can't make any change on it. So now you need to select your curve, go in the Graph Editor, select the Evaluation Time track, open the Properties panel on the right (N), press the Modifier tab and delete the Generator.

enter image description here

  • Now the camera won't move anymore because you're supposed to generate its movement manually. Keep the curve selected, go in the Properties panel > Data > Path Animation. Now you will set the keyframes with the Evaluation Time value. For example at frame 1 put the value at 0, which means that the camera will be at the very beginning of the curve, and insert a keyframe with i.

enter image description here

  • At frame 50 put the Evaluation Time at 100 (which is the end of your curve as the Frames default value is 100) and insert a second keyframe with i.

enter image description here

  • At frame 100 insert a third keyframe with an Evaluation Time of 0 to bring the camera back to the beginning of the curve.

enter image description here

  • You can play with the Graph Editor curve to slow down or accelerate the camera movement.
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  • $\begingroup$ Hello, thank you for your complete answer ! I failed somewhere I think ; When I click for play the animation the camera don't move anymore... $\endgroup$
    – Prim
    Jun 14 '19 at 13:13
  • $\begingroup$ it won't move after you delete the Generator, it's normal, is it what you're talking about? $\endgroup$
    – moonboots
    Jun 14 '19 at 14:18
  • $\begingroup$ Nop, after set key manually thaht does'nt work. I restart it and the camera move but it's not going and back on the curve. (just one way and not the way back) $\endgroup$
    – Prim
    Jun 14 '19 at 15:11
  • $\begingroup$ please share your file: blend-exchange.giantcowfilms.com $\endgroup$
    – moonboots
    Jun 14 '19 at 15:45

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