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In Pose Mode, clearing a bones Scale Transform also clears that bone's Bendy Bone Ease in/out values and also Scale in/out values
Closed, InvalidPublicKNOWN ISSUE

Description

System Information
Operating system: Win10 Pro
Graphics card: Nvidia 1080 GTX Ti
RAM: 16Gb

Blender Version
blender2.7, commit date: 2019-05-04 13:12, hash: d83a72ec104c

Short description of error
In Pose Mode, when clearing any bones' Scale Transform, via shortcut Alt-S that bones' Bendy Bones' properties of Scale and Easing are reset to 1.0 and 0.0 respectively.
This makes it hard to reset the whole armature easily, as each individual Bendy Bones' scale values X Y and Z have to be set to scale of 1 individually.

Exact steps for others to reproduce the error
The bone doesn't even have to have more than 1 segment.
In any bone's Bendy Bones property set Scale In/Out values to anything other than the default 1.
Set Easing In/Out values to anything other than the default 0.0.
In 3D view press Alt-S.
The values will revert to default after a short delay.

Event Timeline

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to Normal.May 21 2019, 11:19 AM

Can confirm the behaviour.

However, I am unsure if this would be considered a bug.

If we change Clear Transform > Scale to only reset lenght, we should probably add something like Clear Transform > BendyBone [which then clears Scale In/Out, Easing In/Out].
Also note that atm. Scale BBone (bbone display scale, also envelope) is unaffected by Alt+S, we should probably have something like Clear Transform > BBone Scale as well?

Would like to gather opinions here: @Alexander Gavrilov (angavrilov), @Brecht Van Lommel (brecht): what do you think?
Also (while we are a t it): @William Reynish (billreynish) : would it make sense to find a better name for Scale BBone in the UI?

Setting to normal priority for the time being...

This comment was removed by Lucy (LucyFughr).

In case somebody else comes across this looking for a solution, here's a script that sets all the bones' scale to 1,1,1 in the selected armature.

#Set bones scale to 1
import bpy
from mathutils import Vector, Quaternion

arm = bpy.context.object

for pb in arm.pose.bones:
    pb.scale = Vector( (1, 1, 1) )

I don't think this is an intended behavior, or at least it shouldn't be. Bendy bone settings could be used as permanent effect, adding a bit of elasticity to cartoon characters. Having the Clear Transform option, which is often used for posing, clear those settings is very inconvenient. Took me a month or so after I started implementing bendy bones on my characters to notice why the Ease in/out settings kept getting reset, and it ended up being because I often select all bones and use Clear all transform to quickly get it back to T-pose.

Short description of error: In Pose Mode, when clearing any bones' Scale Transform, via shortcut Alt-S that bones' Bendy Bones' properties of Scale and Easing are reset to 1.0 and 0.0 respectively. This makes it hard to reset the whole armature easily, as each individual Bendy Bones' scale values X Y and Z have to be set to scale of 1 individually.

Oh trust me. this error goes as far as everything that has to do with Bendy Bones parameters. Action constraints literally cannot be used because of a similar issue. Also You would think you could add bone drivers to the parameters of the "stretch to" part of the bendy bone. Nope. Even the bones driving the parameter are bugged out.

Tested 12/12/2019 Blender 2.81**

Sybren A. Stüvel (sybren) claimed this task.

This is working as-designed. Bendy Bones were introduced in rB49aeee5a3dfa: Bendy Bones: Advanced B-Bones for Easier + Simple Rigging, which already featured the reset of the scale in/out parameteres with Alt+S. rBa819ef65c071: Fix for T48988 - Enabling bbone easing for posemode introduced the ease in/out parameter, which was also reset with Alt+S.

The behaviour can be described as counter-intuitive or annoying, but it's not considered a bug.

Sybren A. Stüvel (sybren) changed the subtype of this task from "Report" to "Known Issue".Mon, Jan 13, 5:02 PM

I've added this issue to my Animation: Weak Areas wiki page, so that it's not forgotten.