Bone rotation in pose mode is imprecise. #81802

New Issue

Adam Labus · 2020-10-17T18:41:14+02:00

Adam Labus commented

2020-10-17 18:41:14 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.14736 Core Profile Context 20.9.1 27.20.12029.1000

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0
Worked: (newest version of Blender that worked as expected)

Short description of error
It seems that under strangely specific conditions bones in blender rotate imprecisely, adding little rotation values to other axis in the process. This can be frustrating for many reasons. I have been able to reacreate this problem on another PC with the older version of blender (2.8).

Exact steps for others to reproduce the error

Open blender and add a new deafult scene delete everything
Add an Armature go into pose mode
Rotate the bone on the Global Y axis by 90 degrees (it doesnt matter if its -90 or +90)
Switch the Rotation Mode to XYZ Euler (The order of this step doesnt matter)
5 Rotate the bone on the Global X or Z axis and when you open up the tranform panel you can see that little rotations like -0.000001d are being added to the other axis
Rotate only with the gizmo

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.14736 Core Profile Context 20.9.1 27.20.12029.1000 **Blender Version** Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `3e85bb34d0` Worked: (newest version of Blender that worked as expected) **Short description of error** It seems that under strangely specific conditions bones in blender rotate imprecisely, adding little rotation values to other axis in the process. This can be frustrating for many reasons. I have been able to reacreate this problem on another PC with the older version of blender (2.8). **Exact steps for others to reproduce the error** 1. Open blender and add a new deafult scene delete everything 2. Add an Armature go into pose mode 3. Rotate the bone on the Global Y axis by 90 degrees (it doesnt matter if its -90 or +90) 4. Switch the Rotation Mode to XYZ Euler (The order of this step doesnt matter) 5 Rotate the bone on the Global X or Z axis and when you open up the tranform panel you can see that little rotations like -0.000001d are being added to the other axis Rotate only with the gizmo

Adam Labus commented

2020-10-17 18:41:14 +02:00

Added subscriber: @Biggie-3

Richard Antalik commented

2020-10-20 07:13:28 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-10-20 07:13:28 +02:00

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

Richard Antalik closed this issue

2020-10-20 07:13:28 +02:00

Richard Antalik self-assigned this 2020-10-20 07:13:28 +02:00

Richard Antalik commented

2020-10-20 07:13:28 +02:00

This is caused by the fact, that numbers in computers don't have infinite precision. Look up floating point error if you want to know more.
We can't do much about this unfortunately. So this isn't a bug.

This is caused by the fact, that numbers in computers don't have infinite precision. Look up floating point error if you want to know more. We can't do much about this unfortunately. So this isn't a bug.

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Bone rotation in pose mode is imprecise. #81802