Extrude and Move on Normals does not move vertices or edges on normals #57681

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Martynas Žiemys · 2018-11-07T20:40:08+01:00

Martynas Žiemys commented

2018-11-07 20:40:08 +01:00

System Information
Windows 10 Pro, GTX 970

Blender Version
Broken: 2.79b f4dc9f9d68, 2.80 Alpha2 2018-11-02 c4c62e6df5 also various 2.79 daily builds

Short description of error
Extrude and Move on Normals does not move vertices or edges on normals as the label of the operator suggests and also changes the normals of vertices and edges extruded making it a hard job to extrude and move vertices or edges on their original normals.

Exact steps for others to reproduce the error

Start Blender
Add a monkey
Enter Edit mode
Select any edge or vertex
Hit space and type 'Extrude and Move on Normals' or hit E.
If vertex normal display is enabled in the n panel it can be seen that the normals of newly extruded edges and vertices change. This is not very apparent on vertices of a cube or sphere, but on more irregular surface is well visible. The version 2.8 I checked it on does not have vertex normal display but if vertex is moved in the z direction with normal transform orientation it moves in a different direction than a vertex extruded from it.

**System Information** Windows 10 Pro, GTX 970 **Blender Version** Broken: 2.79b f4dc9f9d68b, 2.80 Alpha2 2018-11-02 c4c62e6df55 also various 2.79 daily builds **Short description of error** Extrude and Move on Normals does not move vertices or edges on normals as the label of the operator suggests and also changes the normals of vertices and edges extruded making it a hard job to extrude and move vertices or edges on their original normals. **Exact steps for others to reproduce the error** 1. Start Blender 2. Add a monkey 3. Enter Edit mode 4. Select any edge or vertex 5. Hit space and type 'Extrude and Move on Normals' or hit E. 6. If vertex normal display is enabled in the n panel it can be seen that the normals of newly extruded edges and vertices change. This is not very apparent on vertices of a cube or sphere, but on more irregular surface is well visible. The version 2.8 I checked it on does not have vertex normal display but if vertex is moved in the z direction with normal transform orientation it moves in a different direction than a vertex extruded from it. ![image.png](https://archive.blender.org/developer/F5429310/image.png)

Martynas Žiemys commented

2018-11-07 20:40:08 +01:00

Added subscriber: @MartinZ

Philipp Oeser commented

2018-11-08 14:10:17 +01:00

Added subscribers: @brecht, @lichtwerk

Philipp Oeser self-assigned this 2018-11-08 14:10:17 +01:00

Philipp Oeser commented

2018-11-08 14:10:17 +01:00

In blender 2.8 you can find the normal display in Overlays.

Regarding the "Vert-Or-Edge-Only" issue:
For mesh elements without face data, it seems normals are just computed to point away from the object origin, see
#57681.blend

So if you extrude an edge or vert only, this new element will follow this rule (yes, its normal will change -- it will just point away from the object origin).

That being said, I assume there could be room for improvement (at least in the case where we have connected edges to a vertex)?
(Saying this because it causes issues in al kinds of tools -- see #57104 for example).

I will also claim this task (same as #57104), unless @brecht already knows this is going to be a dead end (looking into improving vert normals in vert/edge-only-scenario)?

In blender 2.8 you can find the normal display in `Overlays`. Regarding the "Vert-Or-Edge-Only" issue: For mesh elements without face data, it seems normals are just computed to point away from the object origin, see [#57681.blend](https://archive.blender.org/developer/F5441703/T57681.blend) So if you extrude an edge or vert only, this new element will follow this rule (yes, its normal will change -- it will just point away from the object origin). That being said, I assume there **could** be room for improvement (at least in the case where we have connected edges to a vertex)? (Saying this because it causes issues in al kinds of tools -- see #57104 for example). I will also claim this task (same as #57104), unless @brecht already knows this is going to be a dead end (looking into improving vert normals in vert/edge-only-scenario)?

Philipp Oeser commented

2018-11-08 14:30:28 +01:00

sidenote: found this comment:

/* following Mesh convention; we use vertex coordinate itself for normal in this case */

If this is set in stone, I am going to leave this as is, close the report (along with #57104), but still would like to hear an opinion from someone else...

sidenote: found this comment: > /* following Mesh convention; we use vertex coordinate itself for normal in this case */ If this is set in stone, I am going to leave this as is, close the report (along with #57104), but still would like to hear an opinion from someone else...

Brecht Van Lommel commented

2018-11-08 14:32:23 +01:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2018-11-08 14:32:23 +01:00

Brecht Van Lommel commented

2018-11-08 14:32:23 +01:00

Extrude moves faces along face normals.

Taking into account vertex normals for vertices and edges could be useful, but that's a missing feature that would be nice to add, not a bug.

Extrude moves faces along face normals. Taking into account vertex normals for vertices and edges could be useful, but that's a missing feature that would be nice to add, not a bug.

Martynas Žiemys commented

2018-11-08 14:35:44 +01:00

I would mainly consider this to be a bug because the label of the operator in the search menu says 'move on normals' and then the actual functionality does not match this. Since vertices and edges could be moved on their original normals I think it would be reasonable to expect this. The other problem here is that there is no easy way to extrude edges and then move them on the original normals because of the way the normals are calculated as you pointed out. I think this would be a good reason for the operator to work according to it's label. I am no programmer but since the 'Extrude only Vertices' operator leaves the normals as originals and it is then possible to grab and move them on the original normals even though they are recalculated immediately after the operation starts, I assumed that it should not be something impossible.

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Extrude and Move on Normals does not move vertices or edges on normals #57681