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I would like to create an animation in which something blows up, starting at a normal speed, slows down to a stop, and then reforms. I know I can manually spread out the keyframes in the dope sheet editor (by spreading the keyframes farther and farther apart and then pasting a copy in reverse), but is there a way to do this automatically?

Example of distances between keyframes: 1,1,1,1,2,4,8,16,32 || 32,16,8,4,2,1,1,1,1 Where || is where the new keyframes end and I paste a copy in reverse order.

Doing it manually works when the speed change happens over a few frames, but if I want the process to extend over 60-120 frames, the process becomes both harder to correctly guess the distance, and it takes substantially more time. Is there something such as a way to edit keyframe distance in the NLA editor?

Any help is greatly appreciated. Please comment if anything is unclear.

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  • $\begingroup$ By spreading them parabolically, do you mean than the distance between the key frames is goverened by a quadratic equation? $\endgroup$ – user7952 Nov 18 '14 at 1:51
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    $\begingroup$ why not use the graph editor? wiki.blender.org/index.php/Doc:2.6/Manual/Animation/Editors/… $\endgroup$ – cegaton Nov 18 '14 at 2:03
  • $\begingroup$ @SixthOfFour essentially, yes. So ie. Distances: 1,1,1,1,2,4,8,16,32 || 32,16,8,4,2,1,1,1,1 Where || is where the new keyframes end and I paste a copy in reverse order. I have updated the post. $\endgroup$ – Matthew D. Scholefield Nov 18 '14 at 2:13
  • $\begingroup$ @cegaton I'm afraid that only deals with interpoliating keyframes; not the distance between them. $\endgroup$ – Matthew D. Scholefield Nov 18 '14 at 2:16
  • $\begingroup$ You can use modifiers to create the cycle wiki.blender.org/index.php/Doc:2.6/Manual/Animation/Editors/… $\endgroup$ – cegaton Nov 18 '14 at 2:21
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I made both a slow-down addon and a reverse addon. A combination of those two may be helpful?

How can I slow down or animate time?

How to reverse an animation?

EDIT

This is designed to help you with the result you are looking for, which is not necessarily parabolic.

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