bone roll from matrix

#1

Hi folks,

I’d like to write a more robust operator for orienting bones. Thing is, I’m not sure how to go from a calculated matrix to Blender’s head / tail / roll. If I have a matrix with proper rotation vectors already plugged in, could anyone tell me the math needed to extract a roll value from that?

Thanks in advance!

#2

I can’t help you directly, but there’s a script written by Bassam Kurdali called ‘rigamarule’, it may have the functionality or give you an idea of what you’re looking for:

http://tube.freefac.org/post/rigamarule-0-2-release

#3

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