Mesh selection bug (Blender 3.0) #94981

System Information
Operating system: Windows-10-10.0.19044-SP0
Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2

Blender Version
Broken: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: f1cca30557, type: release

I select the mesh on the icing object by left clicking mouse, dragging it across the points that I want. (If any mesh below the X & Y axis are included in the selection, then it will also select the mesh on the other side of the icing, below the X & Y axis.) For some reason, when making the selection, it ignores the donut below the icing, as if it's not there. I don't know if this is a normal thing or not.

(Earlier I said it happens with the Solidify Modifier, but that was wrong. I Removed the Solidify Modifier and this still happens. This also happens no matter which way you view it, as long as you select mesh that are below X & Y axis.)

I have attached a video to better explain. I have also attached my .blend file. (I also tried this on version on 2.93.7 and I have the same issue.)

Update: This isn't a bug, but I have made a request to improve mesh selection.
I have created the feature request here: Improved Mesh Selection in Edit Mode
If possible, please leave an upvote on it. Thank you!

Video:
blender_bug2.mp4

Blend File:
donut.blend

Added subscriber: @d-b

Closed as duplicate of #94686

Added subscriber: @PratikPB2123

Hi, please take a look at this issue, it was closed and marked as a duplicate, which it wasn't. It's an entirely different issue. In the video that I attached, I had proportional editing turned off. In the video, I show that it works correctly at first when the view is above the X & Y axis, but as soon as I change the view that looks from below the X &Y axis, it causes the bug.

Added subscriber: @HooglyBoogly

Added subscriber: @FynnGr

Added subscriber: @kevindietrich

Added subscribers: @mano-wii, @ideasman42

Changed status from 'Duplicate' to: 'Needs Triage'

Removed subscribers: @kevindietrich, @FynnGr, @HooglyBoogly, @PratikPB2123

Removed subscribers: @ideasman42, @mano-wii

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

Hi, thanks for the report. I can reproduce. Did you apply solidify modifier on Donut object?
Problem looks similar to: #82182 (Solidify cause wrong vertex selection in edit mode)

Added subscriber: @iss

It is same issue though, here you can substitute proportional editing with box select - vertices on the other side are obstructed by donut object, but it is not being edited, therefore box select will get projected through it.

If this is a bug then please specify Blender version where this worked, you can find all previous versions in https://download.blender.org/release/

Added subscriber: @PratikPB2123

In #94981#1289734, @PratikPB2123 wrote:
Hi, thanks for the report. I can reproduce. Did you apply solidify modifier on Donut object?
Problem looks similar to: #82182 (Solidify cause wrong vertex selection in edit mode)

Yes that seems to be the issue, while this bug happened on the icing object which had the solidify modifier, it did not happen on the donut itself since it didn't have that modifier. However just earlier I tried moving the icing up on the z axis and it worked just fine, so it happens with that modifier to any mesh that is below the x and y axis.

In #94981#1290169, @iss wrote:
It is same issue though, here you can substitute proportional editing with box select - vertices on the other side are obstructed by donut object, but it is not being edited, therefore box select will get projected through it.

If this is a bug then please specify Blender version where this worked, you can find all previous versions in https://download.blender.org/release/

Yes you are right, I guess I just couldn't understand why selecting caused an issue only when it was below the x and y axis. I thought it was specific enough to be a bug. Just now I moved the icing a bit up on the z axis so the bottom half of the icing is not below the x and y axis and the bug doesn't happen that way. It only happens with the solidifier modifier applied (then if any part of the object's mesh is below the x and y axis, it will cause the bug.)

Added subscriber: @lichtwerk

This is not same issue as #82182 - Geometry of this modifier is not displayed in edit mode. Again, geometry can't be occluded by donut, because it's not in edit mode. When you hide it (it's not seen by Blender in edit mode) you see that it works as expected.

In #94981#1290299, @d-b wrote:
Just now I moved the icing a bit up on the z axis so the bottom half of the icing is not below the x and y axis and the bug doesn't happen that way. It only happens with the solidifier modifier applied (then if any part of the object's mesh is below the x and y axis, it will cause the bug.)

Can't reproduce this really, can you upload this file?

It is possible that I am misunderstanding this report though. @lichtwerk can you double check me on this? There have been 3 nearly identical reports and this feels weird to close them as invalid.

This comment was removed by @d-b

In #94981#1291125, @iss wrote:
This is not same issue as #82182 - Geometry of this modifier is not displayed in edit mode. Again, geometry can't be occluded by donut, because it's not in edit mode. When you hide it (it's not seen by Blender in edit mode) you see that it works as expected.

In #94981#1290299, @d-b wrote:
Just now I moved the icing a bit up on the z axis so the bottom half of the icing is not below the x and y axis and the bug doesn't happen that way. It only happens with the solidifier modifier applied (then if any part of the object's mesh is below the x and y axis, it will cause the bug.)

Can't reproduce this really, can you upload this file?

It is possible that I am misunderstanding this report though. @lichtwerk can you double check me on this? There have been 3 nearly identical reports and this feels weird to close them as invalid.

Nevermind what I said about moving the icing up, that didn't really do anything either.

I want to clear things up a bit, earlier I said it happens with the Solidify Modifier, but that was wrong. I Removed the Solidify Modifier and this still happens. This also happens no matter which way you view it, as long as you select mesh that are below X & Y axis, you can test this in the same .blend file, and I have uploaded another video.

I added a video that shows it working correctly in blender 2.79.
Update: Unfortunately, after playing around with it some more, the same thing happens in 2.79 so no, it does not work there either.

The same situation shown in the video also happens in 2.79. So it's not a regression.

What happens is that when selecting in edit mode, Blender does not consider (or see) objects outside edit mode.

So, some things that are occluded for the user are actually not occluded for Blender and so are also selected.

This behavior could change, but this would need to be discussed first and the report would be a request for modified/improved behavior.

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

Did I misunderstand the problem?

Added subscriber: @mano-wii

In #94981#1291335, @mano-wii wrote:
The same situation shown in the video also happens in 2.79. So it's not a regression.

What happens is that when selecting in edit mode, Blender does not consider (or see) objects outside edit mode.

So, some things that are occluded for the user are actually not occluded for Blender and so are also selected.

This behavior could change, but this would need to be discussed first and the report would be a request for modified/improved behavior.

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

Did I misunderstand the problem?

You understood it perfectly. Blender doesn't consider other objects which are outside of the edit mode in the current object. I think I misunderstood the problem thinking it was a bug, but it was just a normal thing in blender. I do think that it would be nicer to have this feature implemented. I will try to request it with the link provided, thank you. I'm not sure if it will be added though, I'm sure others might have requested this before me. Thanks anyways!

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

In #94981#1291337, @d-b wrote:
I'm sure others might have requested this before me. Thanks anyways!

This is a good thing as it helps us to define a priority for the feature.

Since the misunderstanding has been cleared up, I am changing the status of the report.
It can still be used for consultation.

In #94981#1291348, @mano-wii wrote:

In #94981#1291337, @d-b wrote:
I'm sure others might have requested this before me. Thanks anyways!

This is a good thing as it helps us to define a priority for the feature.

Since the misunderstanding has been cleared up, I am changing the status of the report.
It can still be used for consultation.

Very well, thank you for the help. I will go ahead and make a request for this then.

I went ahead and created a feature request, if you guys can upvote it that would be great:
Improved Mesh Selection in Edit Mode

Thanks!

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Mesh selection bug (Blender 3.0) #94981