Broken Rotation to Deltas for Quaternions and Axis Angle #69314

New Issue

Henrik D. · 2019-08-29T21:44:13+02:00

Henrik D. commented

2019-08-29 21:44:13 +02:00

System Information
Operating system: Linux
Graphics card: -

Blender Version
Broken: 2.79b, 2.80, 2.81 Alpha 2019-08-26
Worked: -

Short description of the bug
Apply Transforms > Rotation to Deltas, does ADD the current rotation values to the existing delta transforms
For Quaternions that should MULTIPLY with the current delta value. Due to the fact that it adds it,
it results in a different transform after that operation.
Also Rotation to Deltas does entirely fail for Axis Angle rotation representation.

Exact steps for others to reproduce the error
Start with the default startup file and rotate the cube randomly.
Set the rotation representation to Quaternion or Axis Angle.
Press Ctrl+A and select Rotation to Deltas.
The Cube now has a messed up non unit quaternion in the transform deltas
or nothing changed at all for the axis-angle case.

**System Information** Operating system: Linux Graphics card: - **Blender Version** Broken: 2.79b, 2.80, 2.81 Alpha 2019-08-26 Worked: - **Short description of the bug** Apply Transforms > Rotation to Deltas, does ADD the current rotation values to the existing delta transforms For Quaternions that should MULTIPLY with the current delta value. Due to the fact that it adds it, it results in a different transform after that operation. Also Rotation to Deltas does entirely fail for Axis Angle rotation representation. **Exact steps for others to reproduce the error** Start with the default startup file and rotate the cube randomly. Set the rotation representation to Quaternion or Axis Angle. Press Ctrl+A and select Rotation to Deltas. The Cube now has a messed up non unit quaternion in the transform deltas or nothing changed at all for the axis-angle case.

Henrik D. commented

2019-08-29 21:44:13 +02:00

Added subscriber: @HDMaster84

Abid Maqbool commented

2019-08-30 08:34:56 +02:00

Added subscriber: @AbidMaqbool

Abid Maqbool commented

2019-08-30 08:34:56 +02:00

IMO, Not looks like a bug...
I think, Rotation To Deltas works just like this. as tool-tip saying:

Exact Steps:

Rotate Cube -> Z Axis -> 45d
Convertto Quaternion
Note values there (will be addedwith Rotation To Deltas):
Ctrl + A Apply -> Rotation To Deltas
Values are added up to existing transform (cube) & reset to defaults in text-fields

Before Applying:

After:

Rotation To Deltas.blend
All Blender versions -> Same behavior
Thanks

IMO, Not looks like a bug... I think, **Rotation To Deltas** works just like this. as **tool-tip saying**: ![image.png](https://archive.blender.org/developer/F7710427/image.png) **Exact Steps:** * **Rotate** Cube -> **Z** Axis -> **45**d * **Convert**to **Quaternion** * **Note values** there (will be **added**with `Rotation To Deltas`): ![image.png](https://archive.blender.org/developer/F7710432/image.png) * **Ctrl + A** `Apply` -> **Rotation To Deltas** Values are **added up** to **existing** transform (cube) & reset to **defaults** in **text-fields** ![image.png](https://archive.blender.org/developer/F7710434/image.png) **Before Applying:** ![image.png](https://archive.blender.org/developer/F7710438/image.png) **After:** ![image.png](https://archive.blender.org/developer/F7710436/image.png) [Rotation To Deltas.blend](https://archive.blender.org/developer/F7710440/Rotation_To_Deltas.blend) **All Blender versions -> Same behavior** Thanks

Henrik D. commented

2019-09-11 20:54:52 +02:00

As I understand the apply operators, they should all leave the visuals exactly as is, so this is a bug. It completly not doing anything with axis angle representation is a bug for sure though, but even the problem with the quaternion isn't, that it rotates the cube, the problem is, that the resulting delta quaternion is not a unit quaternion (which all rotation quaternions are unit quaternions)

Robert N. commented

2020-01-06 12:17:43 +01:00

Added subscriber: @RobertN

Germano Cavalcante commented

2020-01-07 15:46:50 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-01-07 15:46:50 +01:00

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

Germano Cavalcante commented

2020-01-07 15:46:50 +01:00

In fact it seems that there is an error here.
The code just adds the quartenion values in the delta.
This only works for location.

Axis Angle has no delta support (object.py$751 )

In fact it seems that there is an error here. The code just adds the quartenion values in the delta. This only works for location. `Axis Angle` has no delta support ([object.py$751 ](https://developer.blender.org/diffusion/B/browse/master/release/scripts/startup/bl_operators/object.py$751))

blender-admin commented

2020-01-07 15:52:44 +01:00

This issue was referenced by e665c2c893

This issue was referenced by e665c2c89326f4b13270d0d5d5082b5368413371

Germano Cavalcante commented

2020-01-07 15:56:31 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Germano Cavalcante closed this issue

2020-01-07 15:56:31 +01:00

Germano Cavalcante self-assigned this 2020-01-07 15:56:31 +01:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Broken Rotation to Deltas for Quaternions and Axis Angle #69314