Dissolve Edges should not dissolve vertices that are not previously selected #109765

New Issue

kursad k · 2023-07-06T03:42:18+02:00

kursad k commented

2023-07-06 03:42:18 +02:00

System Information
Operating system: Win 11

Blender Version
Broken: 1a44120d71
Worked: N/A

Updated description:

The "Dissolve Vertices" option from "Dissolve Edges" operator should not dissolve vertices that are not previously selected.

The vertex in red circle should not be dissolved in any way, no matter whether "Dissolve vertices" option is on or off. And this only happens when the vertex in red circle and the adjacent selected one being 3-way connected.

Reproduce:

Open 109765.blend.
x > Dissolve Edges.
Try enabling and disabling "Dissolve Vertices" option in the operator arguments panel, either way it's incorrect.

Expected behaviour:

"Dissolve Vertices" option should never dissolve the vertex circled in red.

Original description:

It seems like Blender removes non connected vertices during edge dissolve. See the video and the image

Exact steps for others to reproduce the error

Load bug_05072023_2041_45 file.
delete the selected edges using "X->Dissolve Edges".

**System Information** Operating system: Win 11 **Blender Version** Broken: 1a44120d7175 Worked: N/A Updated description: The "Dissolve Vertices" option from "Dissolve Edges" operator should not dissolve vertices that are not previously selected. The vertex in red circle should not be dissolved in any way, no matter whether "Dissolve vertices" option is on or off. And this only happens when the vertex in red circle and the adjacent selected one being 3-way connected. ![图片](/attachments/54d72881-1695-45e7-a282-306764297870) Reproduce: 1. Open `109765.blend`. 2. x > Dissolve Edges. 3. Try enabling and disabling "Dissolve Vertices" option in the operator arguments panel, either way it's incorrect. Expected behaviour: "Dissolve Vertices" option should never dissolve the vertex circled in red. ------- Original description: It seems like Blender removes non connected vertices during edge dissolve. See the video and the image | | | |--|--| | ![blender_bP0X8NRcFs.jpg](/attachments/c9597eba-e7f4-468f-b032-8ad0f9eec160) | <video src="/attachments/66033c0c-1856-484c-b187-53c1e907c924" title="blender_mqFBR66QUe.mp4" controls></video> | **Exact steps for others to reproduce the error** 1. Load `bug_05072023_2041_45` file. 2. delete the selected edges using "X->Dissolve Edges".

bug_05072023_2041_45.zip

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109765.blend

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图片.png

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blender_bP0X8NRcFs.jpg

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blender_mqFBR66QUe.mp4

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kursad k added the

labels 2023-07-06 03:42:19 +02:00

kursad k changed title from ~~Edge disolve removes the corner vvertices that are not connected to the dissolved edges~~ to Edge dissolve removes the corner vvertices that are not connected to the dissolved edges

2023-07-06 03:42:27 +02:00

kursad k changed title from ~~Edge dissolve removes the corner vvertices that are not connected to the dissolved edges~~ to Edge dissolve removes the corner vertices that are not connected to the dissolved edges

2023-07-06 03:46:26 +02:00

YimingWu commented

2023-07-06 04:03:22 +02:00

I'd say this result is expected, because for a 3-edge connected vertex, if you dissolve two of the edges, the other edge has nothing to connect to, hence it's also removed. if you don't want that vertex to be removed, you can make a 4-way connection like this: So I believe this is not a bug.

I'd say this result is expected, because for a 3-edge connected vertex, if you dissolve two of the edges, the other edge has nothing to connect to, hence it's also removed. if you don't want that vertex to be removed, you can make a 4-way connection like this: So I believe this is not a bug. ![图片](/attachments/919ae58e-889b-498a-94c7-8dba986c18c0) ![图片](/attachments/952f611a-b8c2-4256-bc0c-7d94d3a614e9)

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YimingWu closed this issue

2023-07-06 04:03:58 +02:00

Blender Bot added

and removed

labels 2023-07-06 04:04:00 +02:00

kursad k commented

2023-07-06 04:08:26 +02:00

This is not how it works in other DCCs. It would be nice if this produces the desired effect given, it is deleting a vertex that has nothing to do with the intended edge.

YimingWu commented

2023-07-06 04:16:40 +02:00

You probably meant something like this?

Humm after thinking about it for a while, it does appear that the "dissolve vertices" will dissolve vertices that's not selected but affected by the "adjacently removed edges". I guess this can be improved.

![图片](/attachments/47413033-860a-4546-97f1-2cc94cff99a5) You probably meant something like this? Humm after thinking about it for a while, it does appear that the "dissolve vertices" will dissolve vertices that's not selected but affected by the "adjacently removed edges". I guess this can be improved.

图片.png

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❤️ 1

YimingWu reopened this issue

2023-07-06 04:16:42 +02:00

Blender Bot added

and removed

labels 2023-07-06 04:16:45 +02:00

YimingWu added

and removed

labels 2023-07-06 04:17:47 +02:00

YimingWu changed title from ~~Edge dissolve removes the corner vertices that are not connected to the dissolved edges~~ to Dissolve Edges > `Dissolve Vertices` option should not dissolve vertices that are not previously selected.

2023-07-06 04:22:04 +02:00

YimingWu commented

2023-07-06 04:28:39 +02:00

Updated description for more clear topology.

👍 1

kursad k commented

2023-07-06 08:08:34 +02:00

Thanks for reopening this. The solution you provided is super messy because one has to triangulate, dissolve edges then remove the temporary edge, which is really way too much work in a real world scenario given this operation could be employed many times on denser meshes, it will create so much friction. That is the reason I opened the bug, not that i could not find a work around, it is just that this is promoting bad practices and wastes time away beside deleting something that is not part of the operation directly.

Iliya Katushenock commented

2023-07-06 09:44:20 +02:00

This is expected behavior and there is a separate setting for what you want:

Thanks for the report, but the issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

This is expected behavior and there is a separate setting for what you want: ![image](/attachments/f4ad40cc-cebd-40f5-8147-b03976f9e7c1) Thanks for the report, but the issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors. For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

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Iliya Katushenock closed this issue

2023-07-06 09:44:22 +02:00

Blender Bot added

and removed

labels 2023-07-06 09:44:57 +02:00

YimingWu commented

2023-07-06 09:55:15 +02:00

@mod_moder Nope, disabling that option will also preserve vertices from the edges being dissolved, so either on or off the result is incorrect

YimingWu reopened this issue

2023-07-06 09:55:48 +02:00

Blender Bot added

and removed

labels 2023-07-06 09:55:50 +02:00

Iliya Katushenock added

and removed

labels 2023-07-06 09:57:35 +02:00

Iliya Katushenock changed title from ~~Dissolve Edges > `Dissolve Vertices` option should not dissolve vertices that are not previously selected.~~ to Dissolve Edges should not dissolve vertices that are not previously selected

2023-07-06 09:58:51 +02:00

kursad k commented

2023-07-06 18:18:57 +02:00

@mod_moder Disabling the "dissolve vertices" is a completely different operation and has nothing to do with the original operation. Keeping all the vertices of the edges after dissolve is not what what the original report is about.

@mod_moder Disabling the "dissolve vertices" is a completely different operation and has nothing to do with the original operation. Keeping all the vertices of the edges after dissolve is not what what the original report is about. ![Photoshop_JKRrbb2BEm.jpg](/attachments/f5d28a6c-5feb-4a0c-bf39-977d1cffb272) ![Photoshop_JKRrbb2BEm.jpg](/attachments/6d73217b-a1af-4ebd-9e90-16c7f56e72d4)

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Paul Kotelevets commented

2023-07-08 08:30:21 +02:00

Such cases are usually solved with loopslide, which provide a better control over the result, so we never considered it as critical.
A video:

Such cases are usually solved with loopslide, which provide a better control over the result, so we never considered it as critical. A video:

Loop slide.mp4

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👍 1

kursad k commented

2023-07-08 18:18:02 +02:00

@1D_Inc Sure but that is a completely different operation that happens to give a similar result. It does not address the issue with dissolve.

Paul Kotelevets commented

2023-07-09 06:03:49 +02:00

Can you provide a case with similar problem, in theory solvable by dissolve and not solvable with edge loop sliding?
We didnt found when tried, so we thougth that use cases that produce this issue are supposed to be solved by edge slide instead of dissolve, so we never considered reporting it.

(Unlike vertex deletion checkbox in dissolve operator locking)

Can you provide a case with similar problem, in theory solvable by dissolve and not solvable with edge loop sliding? We didnt found when tried, so we thougth that use cases that produce this issue are supposed to be solved by edge slide instead of dissolve, so we never considered reporting it. (Unlike vertex deletion checkbox in dissolve operator locking)

YimingWu commented

2023-07-09 06:07:54 +02:00

@1D_Inc , using edge slide in this case would need to have auto-merge on, and in some cases if you don't want to dissolve the full loop, it won't work.

Here the main problem is that "Dissolve Vertices" option removed vertices that are not previously selected. That should not happen either way.

@1D_Inc , using edge slide in this case would need to have auto-merge on, and in some cases if you don't want to dissolve the full loop, it won't work. Here the main problem is that "Dissolve Vertices" option removed vertices that are not previously selected. That should not happen either way.

❤️ 1

kursad k commented

2023-07-09 06:08:25 +02:00

I was just saying that the edge slide is a completely different operation, and this issue needs to be solved with edge dissolve, not that edge slide cant do what needs to be done.

Paul Kotelevets commented

2023-07-09 16:00:13 +02:00

Okay, hope it is mathematically possible to solve this for edge dissolve. That will be useful for sure.

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Dissolve Edges should not dissolve vertices that are not previously selected #109765