Probleme with Subdivision Surface in edit Mode #108860

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lph · 2023-06-11T14:42:49+02:00

lph commented

2023-06-11 14:42:49 +02:00

System Information
Operating system: Linux-6.1.31-2-MANJARO-x86_64-with-glibc2.37 64 Bits
Graphics card: Mesa Intel(R) HD Graphics 4000 (IVB GT2) Intel 4.2 (Core Profile) Mesa 23.0.4

Blender Version
Broken: version: 3.5.1, branch: makepkg (modified), commit date: 2023-04-25 13:50, hash: 6ee8aa4997ee
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

The problem is that it is not possible to subdivise surface many times. The fist time, it work, but after, there is a bug and it dont't work correctement.

**System Information** Operating system: Linux-6.1.31-2-MANJARO-x86_64-with-glibc2.37 64 Bits Graphics card: Mesa Intel(R) HD Graphics 4000 (IVB GT2) Intel 4.2 (Core Profile) Mesa 23.0.4 **Blender Version** Broken: version: 3.5.1, branch: makepkg (modified), commit date: 2023-04-25 13:50, hash: `6ee8aa4997ee` Worked: (newest version of Blender that worked as expected) **Short description of error** [Please fill out a short description of the error here] **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] The problem is that it is not possible to subdivise surface many times. The fist time, it work, but after, there is a bug and it dont't work correctement.

sans_nom.blend

861 KiB

lph added the

labels 2023-06-11 14:42:50 +02:00

Pratik Borhade commented

2023-06-12 04:17:45 +02:00

Hi, thanks for the report. Can confirm.
AFAICS, faces that shares same edge are not subdividing further (adjacent faces)
I think this is expected since the behavior is same in 2.83 too (Need to check from code perspective)

Hi, thanks for the report. Can confirm. AFAICS, faces that shares same edge are not subdividing further (adjacent faces) I think this is expected since the behavior is same in 2.83 too (Need to check from code perspective)

YimingWu commented

2023-06-12 05:52:48 +02:00

Not sure what the problem is but looks to me it's working just fine? I can subdiv this with a modifier or subdiv operator.

Could be possible that your GPU is not really supporting GPU subdiv since it's technically unsupported hardware for new versions of blender? Try disabling GPU subdiv in the user preference?

Not sure what the problem is but looks to me it's working just fine? I can subdiv this with a modifier or subdiv operator. Could be possible that your GPU is not really supporting GPU subdiv since it's technically unsupported hardware for new versions of blender? Try disabling GPU subdiv in the user preference? ![图片](/attachments/1c5679b2-bc98-415f-a990-b175e31a7636)

图片.png

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Pratik Borhade commented

2023-06-12 06:03:35 +02:00

After execution of edbm_subdivide_exec/bmo_subdivide_edges_exec new verts are created but no edges are generated to connect them along face.

Forwarding this to devs for confirmation.

before	after subdivision

@ChengduLittleA hi , as far as I understand this report is about "subdivide" operator, not modifier :)

After execution of `edbm_subdivide_exec/bmo_subdivide_edges_exec` new verts are created but no edges are generated to connect them along face. Forwarding this to devs for confirmation. | before | after subdivision | | -------- | -------- | | ![image](/attachments/4519eb98-7b65-4a34-94cb-2d94ebc4fe42) | ![image](/attachments/84ab67fc-7dd1-4749-a326-33cbd4616ccc) | - - - @ChengduLittleA hi , as far as I understand this report is about "subdivide" operator, not modifier :)

image.png

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image.png

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image.png

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Pratik Borhade added the

Module

Modeling

label 2023-06-12 06:05:11 +02:00

YimingWu commented

2023-06-12 06:07:42 +02:00

@PratikPB2123 ah if that's the case then it's probably expected that subdividing n-gon will not generate edges inside it.

However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug?

@PratikPB2123 ah if that's the case then it's probably expected that subdividing n-gon will not generate edges inside it. However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug?

lph commented

2023-06-12 06:28:57 +02:00

Hi, the pb is with subdivide" operator indeed.
Sometimes, edges are created sometimes not.

Hi, the pb is with subdivide" operator indeed. Sometimes, edges are created sometimes not.

Pratik Borhade commented

2023-06-12 06:31:54 +02:00

However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug?

Guess so. Disabling the option should create a 3-4 side face, no?

> However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug? Guess so. Disabling the option should create a 3-4 side face, no?

Philipp Oeser commented

2023-06-12 11:36:03 +02:00

@PratikPB2123 , @ChengduLittleA : do you want to investigate further?
Otherwise I think we can set status label to Needs Information from Developers.

@PratikPB2123 , @ChengduLittleA : do you want to investigate further? Otherwise I think we can set status label to `Needs Information from Developers`.

Pratik Borhade commented

2023-06-12 11:52:16 +02:00

@lichtwerk : In above case, when we subdivide any face of default cube, its adjacent face becomes N-gon.
Referring to manual, when subdividing N-gon : the individual edges will be subdivided but the face will stay unsubdivided (as said here: #108860 (comment))

So I think we can close this report.

However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug?

Guess so. Disabling the option should create a 3-4 side face, no?

but this could be a valid bug.

@lichtwerk : In above case, when we subdivide any face of default cube, its adjacent face becomes N-gon. Referring to manual, when subdividing N-gon : [the individual edges will be subdivided but the face will stay unsubdivided](https://docs.blender.org/manual/en/latest/modeling/meshes/editing/edge/subdivide.html#:~:text=When%20a%20face%20of%20an%20N%2Dgon%20is%20selected%2C%20the%20individual%20edges%20will%20be%20subdivided%20but%20the%20face%20will%20stay%20unsubdivided) (as said here: https://projects.blender.org/blender/blender/issues/108860#issuecomment-957985) So I think we can close this report. - - - > > However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug? > > Guess so. Disabling the option should create a 3-4 side face, no? but this could be a valid bug.

Philipp Oeser commented

2023-06-12 12:13:23 +02:00

OK, since this is documented behavior, fine with closing this one then, feel free to open a separate report for the option.

Philipp Oeser closed this issue

2023-06-12 12:13:25 +02:00

Blender Bot added

and removed

labels 2023-06-12 12:13:27 +02:00

lph commented

2023-06-13 06:41:49 +02:00

thanks for yours analysis, so it s the correct behaviour.
i need to select all the face, to make regular subdivision

thanks for yours analysis, so it s the correct behaviour. i need to select all the face, to make regular subdivision

lph reopened this issue

2023-06-13 06:41:51 +02:00

Blender Bot added

and removed

labels 2023-06-13 06:41:54 +02:00

lph closed this issue

2023-06-13 06:42:00 +02:00

Blender Bot added

and removed

labels 2023-06-13 06:42:03 +02:00

YimingWu commented

2023-06-13 09:41:15 +02:00

@lichtwerk : In above case, when we subdivide any face of default cube, its adjacent face becomes N-gon.
Referring to manual, when subdividing N-gon : the individual edges will be subdivided but the face will stay unsubdivided (as said here: #108860 (comment))

So I think we can close this report.

However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug?

Guess so. Disabling the option should create a 3-4 side face, no?

but this could be a valid bug.

To me I can't get "Create N_Gons" option to take effect on any of my meshes, doesn't matter if it's tri/quad or ngon from the start, the result is always the same.

Try subdiv this cube mesh with the option on or off.

Should this be a separate report? I still didn't fully understand what this option does.

> @lichtwerk : In above case, when we subdivide any face of default cube, its adjacent face becomes N-gon. > Referring to manual, when subdividing N-gon : [the individual edges will be subdivided but the face will stay unsubdivided](https://docs.blender.org/manual/en/latest/modeling/meshes/editing/edge/subdivide.html#:~:text=When%20a%20face%20of%20an%20N%2Dgon%20is%20selected%2C%20the%20individual%20edges%20will%20be%20subdivided%20but%20the%20face%20will%20stay%20unsubdivided) (as said here: https://projects.blender.org/blender/blender/issues/108860#issuecomment-957985) > > So I think we can close this report. > > - - - > > > > However the "Create N-Gons" option doesn't seem to do anything in this situation either. Could this be a bug? > > > > Guess so. Disabling the option should create a 3-4 side face, no? > > but this could be a valid bug. To me I can't get "Create N_Gons" option to take effect on any of my meshes, doesn't matter if it's tri/quad or ngon from the start, the result is always the same. Try subdiv this cube mesh with the option on or off. Should this be a separate report? I still didn't fully understand what this option does.

create_ngons.blend

889 KiB

Pratik Borhade commented

2023-06-13 10:52:19 +02:00

Should this be a separate report?

Yes.

See attached file. You may get an idea what this property does (but I'm not very convinced with the results).

Open file and subdivide selected face
Disabled Create n-gons (adjacent faces are affected.)

> Should this be a separate report? Yes. See attached file. You may get an idea what this property does (but I'm not very convinced with the results). - Open file and subdivide selected face - Disabled `Create n-gons` (adjacent faces are affected.)

subdivide-face.blend

880 KiB

YimingWu commented

2023-06-13 11:30:42 +02:00

Ah I see it's creating connecting part outside the selected area. Interesting... Then I guess this is not a bug, but maybe the tooltip/manual needs some clarification.

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Probleme with Subdivision Surface in edit Mode #108860