[Bf-animsys] Proposal: Extending bbone edit mode preview

[Thomas Seidelmann]

Hey everyone,

I am currently working on T48988, which aims to enable bbones easing 
parameters for animation. So far I provided a patch there which solves 
the core issue and works well.

However I want to use this opportunity to also propose an extension of 
the edit mode preview for bbones, which currently does not correspond to 
blenders actual behavior and is therefore misleading and less helpful 
than it could be. My suggestion would be to make the "Custom Handles" 
options available in both edit and pose mode while still sharing the 
same data  (as it is currently with the easing parameters). This 
clarifies intent and would automatically give the EditBone all relevant 
data for drawing an accurate preview which takes the handles, custom or 
not, fully into account.

This change would give riggers an accurate visual representation of the 
bbones rest pose while in edit mode and enable riggers to take advantage 
of bbone setups using non-straight handles. Which is perfectly viable 
and often faster and more convenient to setup than relying entirely on 
the bbone offset settings alone. You could do this right now, there is 
no change in bbone mechanics involved here, but operating blind does not 
help the process.

Note that this proposal and the easing parameter fix probably will break 
backwards compatibility as the interface changes which means that the 
save locations of parameters in the blend files may change as well.

Best regards,
Thomas


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