Gimbal Transfor Orientation scaled if parent bone scaled on one axis #71514

New Issue

Danila · 2019-11-12T14:20:00+01:00

Danila commented

2019-11-12 14:20:00 +01:00

System Information
Operating system: Windows 10
Graphics card: GeForce GTX 1060

Blender Version
Broken: everywhere

Short description of error
Gimbal Transform Orientation scaled if parent bone is scaled on one axis

Exact steps for others to reproduce the error
Open:
gimbal_test.blend

or:

Select transform orientation to Gimbal
Create two bones, switch rotation mode of both bones to ZYX
Change inherit Scale of second bone to None
rotate both bones by -30 on x axes
Lock scale on x and z axis of first bone
scale first bone and gimbal widget on a second bone will broke

**System Information** Operating system: Windows 10 Graphics card: GeForce GTX 1060 **Blender Version** Broken: everywhere **Short description of error** Gimbal Transform Orientation scaled if parent bone is scaled on one axis ![image.png](https://archive.blender.org/developer/F8267480/image.png) **Exact steps for others to reproduce the error** Open: [gimbal_test.blend](https://archive.blender.org/developer/F8048164/gimbal_test.blend) or: - Select transform orientation to Gimbal - Create two bones, switch rotation mode of both bones to ZYX - Change inherit Scale of second bone to None - rotate both bones by -30 on x axes - Lock scale on x and z axis of first bone - scale first bone and gimbal widget on a second bone will broke

Danila commented

2019-11-12 14:20:00 +01:00

Added subscriber: @DanilaPryamonosov

Stanislav Ovcharov commented

2019-11-12 14:21:21 +01:00

Added subscriber: @StanislavOvcharov

Germano Cavalcante commented

2020-01-09 14:23:36 +01:00

Added subscribers: @ideasman42, @mano-wii

Germano Cavalcante commented

2020-01-09 14:23:36 +01:00

I don't know exactly how gimbal orientation works.
In the example shown, apparently the transformation axes are being scaled along with the first bone.

@ideasman42, is this expected?

I don't know exactly how gimbal orientation works. In the example shown, apparently the transformation axes are being scaled along with the first bone. @ideasman42, is this expected?

Germano Cavalcante changed title from ~~Gimbal Transfor Orientation dont work if parent bone scaled on one axis~~ to Gimbal Transfor Orientation scaled if parent bone scaled on one axis

2020-01-09 16:59:39 +01:00

Germano Cavalcante commented

2020-01-09 16:59:39 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Sybren A. Stüvel commented

2020-01-20 11:37:19 +01:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2020-01-20 11:37:19 +01:00

For the unscaled bone, the gizmo rotates around the bone's local Y axis. For the bone with the scaled parent, the gizmo rotates around a different axis. This looks like a bug to me, but whether it really is a bug in the implementation depends on how Gimbal mode is supposed to work.

The gimbal transformation mode is described in the manual as:

Uses a Gimbal behavior that can be changed depending on the current Rotation Mode.

This doesn't explain at all what the behaviour is, just that it can be changed.

A different manual page describes it as:

Align each axis to the Euler rotation axis as used for input.

This doesn't make sense, as it doesn't explain the input for what.

Both are IMO non-descriptive and should be clarified, so this could just be resolved by fixing the manual.

For the unscaled bone, the gizmo rotates around the bone's local Y axis. For the bone with the scaled parent, the gizmo rotates around a different axis. This looks like a bug to me, but whether it really is a bug in the implementation depends on how Gimbal mode is supposed to work. The gimbal transformation mode is described in [the manual](https://docs.blender.org/manual/en/dev/scene_layout/object/editing/transform/control/orientations.html) as: > Uses a Gimbal behavior that can be changed depending on the current Rotation Mode. This doesn't explain at all what the behaviour is, just that it can be changed. A [different manual page](https://docs.blender.org/manual/en/dev/editors/3dview/controls/orientation.html) describes it as: > Align each axis to the Euler rotation axis as used for input. This doesn't make sense, as it doesn't explain the input for *what*. Both are IMO non-descriptive and should be clarified, so this could just be resolved by fixing the manual.

Philipp Oeser removed the

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Gimbal Transfor Orientation scaled if parent bone scaled on one axis #71514