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I've got a button model, that is supposed to be rotate around the pivot point in the center,

enter image description here

But how to set the pivot point to the exact center is a problem, the center should be further into the hollow area

I know this model is simple and if you create it from a cylinder the pivot is what I want, but I want to know if say I got model from other people and the pivot is not in the center, how can I align it to the center,thanks.

user3505400
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2 Answers2

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In Edit mode, '2' for edge select then ALT-click on the top edge round the inside of the hole and SHIFT-S > Cursor to Selected. If you want it half way down the hole, go to Face mode, ALT-Click one of the edges inside the hole to select the ring of inner faces then SHIFT-S > Cursor to Selected again.

John Eason
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Adding to John Eason's answer: don't forget to set your pivot point accordingly Numpad . > 3D cursor

You could also pivot around the object's origin: Numpad . > Individual origin But then you also have to set the origin correctly: After setting the 3D cursor in Edit mode, you can set the object's origin to the 3D cursor when you're back in Object mode (right click > Set origin > Origin to 3D cursor).

Also helpful in this regard are constraints, e.g. a Limit Rotation constraint so you can only rotate the knob around it's z-axis. Also limiting the amount of rotation is possible with that constraint.

Vincent
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  • Thanks for your answer, I tried to setup the limit rotation constraint, but not working, so I opened up another thread: https://blender.stackexchange.com/questions/211673/trouble-with-local-space-limit-rotation – user3505400 Feb 13 '21 at 14:48