Extrude manifold on multiple non-adjacent faces gives wrong results #78635

New Issue

Wouter Stomp · 2020-07-05T12:11:00+02:00

Wouter Stomp commented

2020-07-05 12:11:00 +02:00

System Information
Operating system: Darwin-19.5.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.9.15

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-28 15:13, hash: b21ba5e579
Worked: never

Short description of error
When using extrude manifold when multiple non-adjacent faces are selected, you sometimes get some weird and inconsistent results with missing edges.

Exact steps for others to reproduce the error
Default cube -> edit mode
Add one loop cut
Select two opposing faces next to the loop cut
Transform orientation: normal, pivot individual origins
Extrude inwards
Result: ngons on both sides with missing edges where they should be. Also the result is different on both opposing sides.

Image: on the left extruding a single face; on the right extruding multiple faces at once:

Example blend file.

T78635_test.blend

**System Information** Operating system: Darwin-19.5.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.9.15 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-28 15:13, hash: `b21ba5e579` Worked: never **Short description of error** When using extrude manifold when multiple non-adjacent faces are selected, you sometimes get some weird and inconsistent results with missing edges. **Exact steps for others to reproduce the error** Default cube -> edit mode Add one loop cut Select two opposing faces next to the loop cut Transform orientation: normal, pivot individual origins Extrude inwards Result: ngons on both sides with missing edges where they should be. Also the result is different on both opposing sides. Image: on the left extruding a single face; on the right extruding multiple faces at once: ![Schermafbeelding 2020-07-05 om 12.03.05.png](https://archive.blender.org/developer/F8666375/Schermafbeelding_2020-07-05_om_12.03.05.png) ---- Example blend file. [T78635_test.blend](https://archive.blender.org/developer/F9586887/T78635_test.blend)

Wouter Stomp commented

2020-07-05 12:11:01 +02:00

Added subscriber: @blenderrocket

Richard Antalik commented

2020-07-08 05:55:05 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-08 05:55:05 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-07-08 05:55:05 +02:00

Select two opposing faces next to the loop cut

I am not sure if I get this correctly. Is it 2 faces that were created from 1 face that has been split by loop cut?

>Select two opposing faces next to the loop cut I am not sure if I get this correctly. Is it 2 faces that were created from 1 face that has been split by loop cut?

Wouter Stomp commented

2020-07-08 22:22:21 +02:00

These two faces:

(not specific to this situation, but just the simplest/easiest way I could find to reproduce the problem)

These two faces: ![Schermafbeelding 2020-07-08 om 22.21.20.png](https://archive.blender.org/developer/F8678831/Schermafbeelding_2020-07-08_om_22.21.20.png) (not specific to this situation, but just the simplest/easiest way I could find to reproduce the problem)

Richard Antalik commented

2020-07-09 06:15:35 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Richard Antalik commented

2020-07-09 06:15:35 +02:00

Thanks for clarification,

I can not reproduce this issue though. I guess it may be only on Mac?

Thanks for clarification, I can not reproduce this issue though. I guess it may be only on Mac?

Yevgeny Makarov commented

2020-08-26 15:08:21 +02:00

Added subscriber: @jenkm

Yevgeny Makarov commented

2020-08-26 15:08:21 +02:00

I can confirm.

#78635.blend

{F8812174, size=full}

I can confirm. [#78635.blend](https://archive.blender.org/developer/F8812166/T78635.blend) {[F8812174](https://archive.blender.org/developer/F8812174/T78635.png), size=full}

Richard Antalik commented

2020-11-27 20:42:16 +01:00

@blenderrocket I am looking at older reports, is this still an issue? Or have anything changed?

Wouter Stomp commented

2020-11-28 21:33:49 +01:00

Results unchanged with 2.92.0 Alpha, branch: master, commit date: 2020-11-27 15:18, hash: fbdf1af355

Results unchanged with 2.92.0 Alpha, branch: master, commit date: 2020-11-27 15:18, hash: `fbdf1af355`

Richard Antalik commented

2020-11-30 00:18:06 +01:00

Thanks for update.

Philipp Oeser commented

2020-12-29 16:07:26 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-12-29 16:07:26 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Philipp Oeser commented

2020-12-29 16:07:26 +01:00

Might be the same as {#80440}?

Note #75913 (New tool to add and subtract prismatic volumes) is already there to subtract in a better way.

Will confirm this for now though since this is also an issue with extruding outwards [which was not the case with #80440]

Might be the same as {#80440}? Note #75913 (New tool to add and subtract prismatic volumes) is already there to subtract in a better way. Will confirm this for now though since this is also an issue with extruding **outwards** [which was not the case with #80440]

Campbell Barton commented

2021-01-19 08:40:24 +01:00

Added subscribers: @mano-wii, @ideasman42

Campbell Barton commented

2021-01-19 08:40:24 +01:00

This looks close to #80440, with the difference that this particular case is supported when extruding a single face, and not when the same faces are being cut from two different directions.

@mano-wii CC'ing you incase you'd like to check on this case.

This looks close to #80440, with the difference that this particular case is supported when extruding a single face, and not when the same faces are being cut from two different directions. @mano-wii CC'ing you incase you'd like to check on this case.

Philipp Oeser removed the

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Extrude manifold on multiple non-adjacent faces gives wrong results #78635