Whenever you animate with key frames, even though the speed can vary, it's always only a straight line, so the end result usually looks jagged in some way. Is there a way to make an animation keyframe from point A to point B make the shape of some kind of subtle arc rather than just a straight line?
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This is what you need: https://docs.blender.org/manual/en/dev/rigging/constraints/relationship/follow_path.html – Jaroslav Jerryno Novotny Oct 09 '17 at 14:41
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https://blender.stackexchange.com/questions/31578/how-to-change-camera-movement-speed-on-path-during-animation/31583?s=5|34.2740#31583 – atomicbezierslinger Oct 09 '17 at 18:18
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Path Constraint .... – atomicbezierslinger Oct 09 '17 at 18:44
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Use the Graph Editor to edit the animation curves. This will allow you to have full control over the shape of the animation. In the graph editor you can select a specific channel (such as the Z Location) and can then add keyframes by way of the Key/Insert Keyframe menu (or I shortcut) and these can be manipulated by grabbing and rotating the bezier handles (assuming it's set to Bezier - the default interpolation mode).
Once you've adjusted the curve it is useful to use the Motion Paths panel to visualise the new path (as in LeoNas's answer).
Rich Sedman
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You have play with Motion paths
Click the butom calculate. It will generate the path.
Position a new keyframe in between two keyframes, and **update paths.
So you will create a curved path instead a straight line animation.
See the imagem below.
LeoNas
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I think it is useful for IK bones or any unconnected bones as the main bone. You cannot make an arc with a connected bone because its pivot – LeoNas Oct 10 '17 at 16:23