Flipless twist bone

#1

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!)

#2

hi,

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

regards,

#3

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/flippingless/flippingless_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.

#4

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