Normal transform orientation for edge is wrong when edge has specific coordinates #53311

New Issue

Satoshi Doita · 2017-11-13T14:09:49+01:00

Satoshi Doita commented

2017-11-13 14:09:49 +01:00

System Information
Windows 7 Professional 64-bit service pack 1
Intel Core i7-2600
8GB RAM
NVIDIA GTX 1060 6GB

Blender Version
Broken: 2.79 5bd8ac9

description of error
When selected edge matches one of following rules, wrong transform orientation being used instead of normal transform orientation.

One of vertex is on local origin.
Or
One of vertex's local coordinate is the other vertex's local coordinate multiplied by power of 2.

e.g. (1, 2, 3)and(4, 8, 12), (0.3, -1.22, 7)and(-2.4, 9.76, -56), (0, 0, 0)and(0.5,0.6,-0.4)

Exact steps for others to reproduce the error

Open attached .blend file and enter edit mode.
Make sure show_manipulator is on and transform orientation is set to normal.
Select edge and see transform orientation.

NormalTransformOrientation.blend

**System Information** Windows 7 Professional 64-bit service pack 1 Intel Core i7-2600 8GB RAM NVIDIA GTX 1060 6GB **Blender Version** Broken: 2.79 5bd8ac9 **description of error** When selected edge matches one of following rules, wrong transform orientation being used instead of normal transform orientation. 1. One of vertex is on local origin. Or 2. One of vertex's local coordinate is the other vertex's local coordinate multiplied by power of 2. e.g. (1, 2, 3)and(4, 8, 12), (0.3, -1.22, 7)and(-2.4, 9.76, -56), (0, 0, 0)and(0.5,0.6,-0.4) **Exact steps for others to reproduce the error** 1. Open attached .blend file and enter edit mode. 2. Make sure show_manipulator is on and transform orientation is set to normal. 3. Select edge and see transform orientation. [NormalTransformOrientation.blend](https://archive.blender.org/developer/F1131539/NormalTransformOrientation.blend)

Satoshi Doita commented

2017-11-13 14:09:49 +01:00

Changed status to: 'Open'

Satoshi Doita commented

2017-11-13 14:09:49 +01:00

Added subscriber: @SatoshiDoita

ronan ducluzeau commented

2017-11-15 18:15:43 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2017-11-15 18:15:43 +01:00

Confirmed on linux for 2.79 and master 556b13f

Confirmed on linux for 2.79 and master 556b13f

Dan Marra self-assigned this 2018-01-10 22:12:06 +01:00

Dan Marra commented

2018-01-10 22:39:36 +01:00

After playing with this a bit, I noticed that if you move the vertex that is positioned at local (0,0,0) to another position, and then move it back to local (0,0,0), the orientation of the manipulator is correct.

Dan Marra commented

2018-01-10 23:23:14 +01:00

My last comment wasn;t entirely true. It seems that in the first case of (0,0,0), setting the pivot point to "active element" corrects the behavior. However, for the second reproduction step regarding multiples of 2, no pivot point selection seems to remedy the problem.

Dan Marra commented

2018-01-11 00:46:53 +01:00

This is actually a problem that occurs when the vertex normal is the same as the normal between both points of the edge; aka the edge is pointing towards the object origin.

Campbell Barton commented

2018-01-11 08:22:29 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2018-01-11 08:22:29 +01:00

Thanks @dmarra for finding the cause of the error, though I closed the diff since I think it doesn't properly resolve the issue.
Modifying the normal by the plane may give bad results in some cases.

The issue is:

the normal and the plane may be aligned or near aligned.
the resulting matrix prioritizes the normal over the plane (the plane is rotated to be orthogonal with the normal).
in the case of wire edges it's expected the orientation is aligned with the edge (in this case the normals aren't meaningful).

Thanks @dmarra for finding the cause of the error, though I closed the diff since I think it doesn't properly resolve the issue. Modifying the normal by the plane may give bad results in some cases. The issue is: - the normal and the plane may be aligned or near aligned. - the resulting matrix prioritizes the normal over the plane (the plane is rotated to be orthogonal with the normal). - in the case of wire edges it's expected the orientation is aligned with the edge (in this case the normals aren't meaningful).

blender-admin commented

2018-01-11 09:09:45 +01:00

This issue was referenced by 0edda8e4ce

This issue was referenced by 0edda8e4ce4e7dc0d72a105b773896b7b17c480b

Campbell Barton commented

2018-01-11 09:17:22 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2018-01-11 09:17:22 +01:00

Dan Marra commented

2018-01-11 14:39:53 +01:00

No problem @ideasman42 . My fix had some weird side effects when I tested it deeper after submitting the patch, so not surprised it was rejected. Glad I could help better define the root cause though.

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Normal transform orientation for edge is wrong when edge has specific coordinates #53311