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My Bezier Curve-handles uses hooks that are parented to each bone. The handles are customized to face outwards from the bone. When rotating the bone, the handles does not follow the rotation of the bone, making the result bend wierd (Image 2). How can I automatically have the curve handles follow the bone more naturally like the last image?

enter image description here

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  • $\begingroup$ Is the bone supposed to rotate only this way? $\endgroup$
    – lemon
    Commented Dec 21, 2023 at 14:07
  • $\begingroup$ The problem with this setup is, a hook is not like a parent object. A hook is only providing a location for an object/vertex or whatever is hooked to it, not the rotation. $\endgroup$
    – Gordon Brinkmann
    Commented Dec 21, 2023 at 14:09
  • $\begingroup$ @lemon The original rig is much more complicated, rotating multiple directions. Thought I would present the problem in the most simplistic way with this example. $\endgroup$
    – Sondre Kile Andersen
    Commented Dec 21, 2023 at 14:29
  • $\begingroup$ @SondreKileAndersen, I think you should had a bit more detailed, because if not you may have wrong answers $\endgroup$
    – lemon
    Commented Dec 21, 2023 at 14:34
  • $\begingroup$ The main problem in your current "result" pic is that you have hooked the control but not the handles-- include the handles in the hook. But you still won't get exactly "What I want" with rotation alone. The desired curve is not just a rotation of control+handle, but a change in handle length as well, a scaling. $\endgroup$
    – Nathan
    Commented Dec 21, 2023 at 16:10

2 Answers 2

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Hook the curve vertices directly to the bones:

enter image description here

enter image description here

Alternatively, you can also hook not only the curve point but also its handles:

enter image description here

Examples with both approaches:

(Blender 4.0)

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you can reach the goal by settings drivers to curve factor start & end.

Be careful with the rotation axis!

I first set both bones to rotation euler xyz.

i used this driver for factor start:

enter image description here

and this driver for the factor end:

enter image description here

be aware that your formula and axis might be different so that it works for you.

result:

enter image description here

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