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I'm relatively new to animation and wonder if there is a way to animate multiple axes (position, rotation...) as a single animation curve. For example, I set two poses in frame 0 and frame 15, and I want to change the easing/interpolation between these poses by hand.

It would be perfect if there were a single curve to interpolate between these two poses, but as far as I know, people usually just tweak each curve separately. Or am I missing something?

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  • $\begingroup$ A location is 3 values: xyz, so it's already 3 curves. You probably don't want the object to move along a single, straight line connecting points <0, 0, 0> and <1, 1, 1>. You could apply some multipliers to the relation between a coordinate and a single value driving it (e.g. a custom property suggested by A), but then it would still be a straight line, e.g. connecting <0, 0, 0> and <1, 2, 3> for <a, 2a, 3a> formula. Going further, you probably not only don't want location components to be synchronized like that, but also you don't actually want to synchronize rotation with location… $\endgroup$
    – Markus von Broady
    Commented Dec 22, 2023 at 9:25
  • $\begingroup$ It seems you're asking for some kind of quality of life feature that will allow you e.g. set the interpolation mode for all keyframes of a given frame, but with a laconic question we can only guess what you actually want. $\endgroup$
    – Markus von Broady
    Commented Dec 22, 2023 at 9:27

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You can add a custom property and make it drive as many properties as you want. If you keyframe the custom property, it will have a single animation curve. However, unless you're happy with a one-to-one relationship, you will still need to define how each of the driven properties will react to the custom property. This means that you will still probably need to customize a curve for each driven property, but it will be a one-time setup step.

Another option is to use an Action constraint. It takes one property as input and performs an action in response. Since an action can record the changes to as many properties as needed, this setup will create the one-to-many output you want. However, you still need to create that action which means manipulating a curve for each property the action has keyframes for.

Action Constraint

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