Flipless twist bone

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  06 June 2013
Flipless twist bone

I recently found this page by Felix Joleanes about a flipless twist bone. It works flawlessly, but I'm having trouble making a 60% bone, 30% bone etc. Up until finding it I had never even heard of quaternions, matrices etc. I've done a fair amount of research on them and gained at least a primitive understanding but I still can't seem to solve the problem.

Here's some of the stuff I've tried:

Slerp function - Causes flipping and 120 degrees and 240 degrees
Orientation Constraint- Flipping at 180 (angle might be different- I can't remember)
DegToRad / Eulerangles- Same flipping as orientation constraint
Expose Transform + Wiring- Usual flipping, makes the flipless bone at the top kinda pointless

Does anyone have a working solution to this problem? If you could explain the maths behind it too I'd be really grateful!

(Ps. This is my first post, I'm glad i finally got round to joining you all!)
  07 July 2013

can you post the screenshot or the file of the problem? file would be great.

  07 July 2013
If you download the file at the bottom of this page you can find an example of the twist bone setup: http://joleanes.com/tutorials/flipp...pingless_01.php

If you make another bone, and try to get that to move 50% of the twist bone's rotation on the X axis without having flipping issues then you'll see the problem.
  07 July 2013
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