Extrude Along Normal does not move edges to the expected direction #119253

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opened 2024-03-09 15:41:34 +01:00 by Daniel Gryningstjerna · 6 comments

Daniel Gryningstjerna commented

2024-03-09 15:41:34 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.67

Blender Version
Broken: version: 4.0.0, branch: blender-v4.0-release, commit date: 2023-11-13 17:26, hash: 878f71061b8e

Short description of error
Extrude Edge Along Normals Tool does not work as expected, this is the result I get:

This is the expected resulat:

This is also how extrudes works in Maya, 3ds Max and all other 3d programs, this used to work fine in Blender as well.

Exact steps for others to reproduce the error
Use the Extrude Along Normal Tool on the selectde edges in the attached .blend file

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.67 **Blender Version** Broken: version: 4.0.0, branch: blender-v4.0-release, commit date: 2023-11-13 17:26, hash: `878f71061b8e` **Short description of error** Extrude Edge Along Normals Tool does not work as expected, this is the result I get: ![extude_along_normal_blender_not_working](/attachments/46f1ba46-3882-4c51-b26f-bbe96b4a3207) This is the expected resulat: ![extude_along_normal_blender_working](/attachments/aa76d99d-4e14-4ced-a48f-a01101040a0e) This is also how extrudes works in Maya, 3ds Max and all other 3d programs, this used to work fine in Blender as well. ![extude_along_normal_maya](/attachments/5825655a-7996-4ff2-b941-e0c1f3619bda) ![extude_along_normal_3ds_max_working](/attachments/23efc719-5c42-4e27-b78a-2bbde31bbc9b) **Exact steps for others to reproduce the error** Use the Extrude Along Normal Tool on the selectde edges in the attached .blend file

extude_along_normal_maya.gif

281 KiB

extude_along_normal_3ds_max_working.gif

1.8 MiB

extude_along_normal_blender_working.gif

963 KiB

Extrude_Edge_Along_Normal.blend

876 KiB

extude_along_normal_blender_not_working.gif

884 KiB

Daniel Gryningstjerna added the

labels 2024-03-09 15:41:35 +01:00

Iliya Katushenock added the

label 2024-03-09 15:44:09 +01:00

Iliya Katushenock commented

2024-03-09 15:46:26 +01:00

Member

I can confirm behavior but not sure if this is bug. Comparison with other software is not a reason.

I can confirm behavior but not sure if this is bug. Comparison with other software is not a reason.

Daniel Gryningstjerna commented

2024-03-09 16:02:57 +01:00

Author

I can confirm behavior but not sure if this is bug. Comparison with other software is not a reason.

Did this not used to work in Blender before? Seems like one of the most basic modeling tools that exists in all 3D modeling software.

> I can confirm behavior but not sure if this is bug. Comparison with other software is not a reason. Did this not used to work in Blender before? Seems like one of the most basic modeling tools that exists in all 3D modeling software.

Iliya Katushenock commented

2024-03-09 16:05:57 +01:00

Member

How did you capture expected result gif?

How did you capture *expected* result gif?

Daniel Gryningstjerna commented

2024-03-09 16:16:52 +01:00

Author

How did you capture expected result gif?

Currently, you can kind of get a similar result in simple cases with Alt+S if two edge loops are almost overlapping, but it's a hack and gives a very bad result in anything mildly complex.

> How did you capture *expected* result gif? Currently, you can kind of get a similar result in simple cases with Alt+S if two edge loops are almost overlapping, but it's a hack and gives a very bad result in anything mildly complex.

Daniel Gryningstjerna commented

2024-03-09 16:19:34 +01:00

Author

How did you capture expected result gif?

Like this:

> How did you capture *expected* result gif? Like this:![Hacky Extrude Edge Along Normals](/attachments/21826e69-ea09-4693-b5de-4949ffef10d5)

Hacky Extrude Edge Along Normals.gif

1.7 MiB

Germano Cavalcante commented

2024-03-11 21:31:20 +01:00

Member

Although it has worked like this for a long time, it is actually not ideal.
What happens is that the normal of vertices connected to the face with zero area cannot be calculated. Thus a normal fallback is set for these normals. This fallback is the direction from the vertex to the origin of the mesh.

We could "workaround" the problem by setting the expected normals in the inset faces function.

I'm confirming the issue for now.

Although it has worked like this for a long time, it is actually not ideal. What happens is that the normal of vertices connected to the face with zero area cannot be calculated. Thus a normal fallback is set for these normals. This fallback is the direction from the vertex to the origin of the mesh. We could "workaround" the problem by setting the expected normals in the inset faces function. I'm confirming the issue for now.

Germano Cavalcante added

and removed

labels 2024-03-11 21:31:44 +01:00

Germano Cavalcante changed title from ~~Extrude Edge Along Normals Tool Does Not Work as Expected Anymore~~ to Extrude Along Normal does not move edges to the expected direction

2024-03-11 21:32:46 +01:00

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