Parenting objects to bones causes offset #60623
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Reference: blender/blender#60623
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System Information
Operating system: MacOS 10.14.2
Graphics card: AMD Radeon R9 M395X 4096 MB
Blender Version
Broken: Blender 2.80 beta Jan 18
Worked: Blender 2.79
Short description of error
When parenting an object to a bone, the object is wrongly offset from it's previous position. This was not the case in 2.79.
Exact steps for others to reproduce the error
This scene is nothing special, just a normal bone and a normal cube. No special settings or anything out of the ordinary. In any case, it serves as a very simple test case for this issue.
Open this Blend:
Object_parent_bone_bug.blend
Press Ctrl-P and select 'Bone'
You'll see the cube fly away to a different position. It should stay put and just become a child without moving. This worked correctly in 2.79.
2.8 beta:
Before Parenting:
After Parenting:
This offset should not happen.
2.79:
Before Parenting:
After Parenting:
Here the object stays correctly put.
Added subscriber: @WilliamReynish
#61990 was marked as duplicate of this issue
#61795 was marked as duplicate of this issue
#61542 was marked as duplicate of this issue
#61112 was marked as duplicate of this issue
#60526 was marked as duplicate of this issue
Added subscriber: @sozap
Added subscriber: @ideasman42
I've narrowed down the bug.
It appears to be related to the redo option Keep Transform.
However, even if you enable it, you have to toggle it off and on again for it to work. Eventually it does do the right thing. But in 2.7x, you did not need to enable this option for the parent/child relationship to have the correct offset. Very strange.
@ideasman42 Might you have an idea of why this option is acting strange? All I can deduce is that there's something wonky to do with Keep Transform when parenting to a bone.
Hmm, even if you just change the redo from Bone to something else and back to Bone, it does the right thing. So it seems like something is not being set correctly initially with this operator?
Added subscribers: @Matthewv1998, @lichtwerk, @EvilPictureBook, @JacquesLucke
Added subscriber: @moisessalvador
Added subscriber: @LevelPixelLevel
Got a fix for this, will upload shortly
This issue was referenced by
2894e75121Added subscriber: @Sergey
Since D4309 doesnt seem to be the desired solution, I'll step down from this and put on @Sergey 's desk, sorry...
Added subscribers: @wevon-2, @ZedDB
Added subscriber: @BassamKurdali
Just confirming the bug here so you know it affects other users. (Currently toggling the option in operator redo as a workaround)
Added subscriber: @JulienDuroure
Added subscriber: @AlexanderOtto
@lichtwerk, is not an undesired solution, but there is something confusing in there which needs some clarification.
Will reply in the patch review.
Changed status from 'Open' to: 'Resolved'
Added subscriber: @kw_lxxi
Hi!
Sorry to bring this back to life, but seems the problem remains somehow. Parenting a mesh to the bone doesn't result in a visual offset in Blender, but once you export to .FBX, and you import that .FBX the offset is there.
I have tried in 2.83 and 2.80, with the same result.
To reproduce the issue:
1.- create an armature with 3 bones, and parent/bone relative a mesh to each bone in pose mode, selecting in some of them "keep transform" (some times have effect in the .fbx file).
2.- Export to .fbx file (uncheck "add leaf nodes").
3.- Import that .fbx to a new scene. You'll notice the offset in some or all of the meshes (that don't happen on 2.79)
A new report for the above was reported in blender/blender-addons#77815 (Meshes parented to bones have an offset in the exported .fbx files.)