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I have this modeled already but I have no idea how I can properly rig for animation.

enter image description here

I am specifically looking rig and animate the flat spring underneath. I would love to figure out how to simulate but maybe that is a longshot. Thanks!

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  • $\begingroup$ Did you model the spring already? I think concentric rings would be easier to rig...Oh! you can just rotate and shrink the spring while using proportional editing! $\endgroup$ – hatinacat2000 Aug 16 '19 at 13:29
  • $\begingroup$ Check on this spool answer. Same concept applies here. $\endgroup$ – Leander Aug 16 '19 at 13:56
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Using bones and curve modifiers

enter image description here

The first bone has 100% influence on the spring.

The second one, its child and which is rotating, has a gradient influence on it.

To make this gradient, start with a simple plane and set the weight to 1 for a side (interior side), and to 0 for the second side (exterior side).

enter image description here

Once done, stretch it and loop cut it.

Now use a spiral curve (add curve extra object standard addon). And add a curve modifier on the spring.

You will need to weight paint a bit on the exterior part that may not move at all.

enter image description here

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  • $\begingroup$ Brilliant. I'm still trying to get my head round the interaction of the Z rotation and the Curve modifier. $\endgroup$ – Robin Betts Aug 17 '19 at 8:58
  • $\begingroup$ The base bone (which does not rotate) as two influences: rotation and positions. That's what is giving the scale effect (at least I think : ). $\endgroup$ – lemon Aug 17 '19 at 9:11

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