Box Selection with Backface Culling ON does not select Objects backfaced to view #79802

New Issue

Eugene Du · 2020-08-15T13:33:52+02:00

Eugene Du commented

2020-08-15 13:33:52 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1650 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.83.4, branch: master, commit date: 2020-08-05 06:00, hash: c113af8288
Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-08-14 20:34, hash: c300fc56c3
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-14 20:53, hash: 199e308670

Short description of error
If Backface Culling option is on in Viewport Shading you cant select Objects that backfaced to view with Box Select tool.
In Edit Mode all fine, you can select them.
If I set active object backfaced to the view, and then use Box Select, it select that backfaced object.
Lasso and Circle Select work fine, and select all objects.

Exact steps for others to reproduce the error
Blender_Box_Select_Behavior.mp4
Box_Selection_BfC_ON.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1650 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 **Blender Version** Broken: version: 2.83.4, branch: master, commit date: 2020-08-05 06:00, hash: `c113af8288` Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-08-14 20:34, hash: `c300fc56c3` Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-14 20:53, hash: `199e308670` **Short description of error** If Backface Culling option is on in Viewport Shading you cant select Objects that backfaced to view with Box Select tool. In Edit Mode all fine, you can select them. If I set active object backfaced to the view, and then use Box Select, it select that backfaced object. Lasso and Circle Select work fine, and select all objects. **Exact steps for others to reproduce the error** [Blender_Box_Select_Behavior.mp4](https://archive.blender.org/developer/F8783344/Blender_Box_Select_Behavior.mp4) [Box_Selection_BfC_ON.blend](https://archive.blender.org/developer/F8783345/Box_Selection_BfC_ON.blend)

Eugene Du commented

2020-08-15 13:33:52 +02:00

Added subscriber: @APEC

Josh Faulkner commented

2020-08-17 22:33:08 +02:00

Added subscriber: @JoshFaulkner

Josh Faulkner commented

2020-08-17 22:33:08 +02:00

I can also confirm this behavior in version: 2.83.3, branch: master, commit date: 2020-07-22 06:01, hash: 353e5bd749. It appears that this behavior is only for very specific cases when viewport backface culling is turned on and objects in the 3d Viewport in Object Mode consist solely of backface culled geometry.

If those conditions are met, box select can’t select those objects.

I can also confirm this behavior in version: 2.83.3, branch: master, commit date: 2020-07-22 06:01, hash: 353e5bd7493e. It appears that this behavior is only for very specific cases when viewport backface culling is turned on and objects in the 3d Viewport in Object Mode consist solely of backface culled geometry. If those conditions are met, box select can’t select those objects.

Richard Antalik commented

2020-08-19 01:35:57 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-08-19 01:35:57 +02:00

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

Richard Antalik closed this issue

2020-08-19 01:35:57 +02:00

Richard Antalik self-assigned this 2020-08-19 01:35:57 +02:00

Richard Antalik commented

2020-08-19 01:35:57 +02:00

There are more inconsistencies, for example culled object will be selected if it is active, and it won't be de-selected, Though this works the same as 2.79 did, so I don't think this is bug really.

Thanks for the report, but the issue reported here is a request for modified 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

There are more inconsistencies, for example culled object will be selected if it is active, and it won't be de-selected, Though this works the same as 2.79 did, so I don't think this is bug really. Thanks for the report, but the issue reported here is a request for modified 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

Eugene Du commented

2020-08-19 08:23:03 +02:00

Maybe it's a bug since 2.79?
So if we find bug in 2.8+ that exist in 2.79 then it's not a bug?
Maybe it need more investigate to this issue?
Why Lasso and Circle Selection does select, and Box itself not?!
But if You think so then ok...

Maybe it's a bug since 2.79? So if we find bug in 2.8+ that exist in 2.79 then it's not a bug? Maybe it need more investigate to this issue? Why Lasso and Circle Selection does select, and Box itself not?! But if You think so then ok...

Richard Antalik commented

2020-08-20 01:06:04 +02:00

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

Richard Antalik reopened this issue

2020-08-20 01:06:04 +02:00

Richard Antalik commented

2020-08-20 01:06:04 +02:00

Behavior may be wrong or inconsistent, but I am not sure if I would call this a bug. I was looking for duplicates and read through report #71156. To me it sounds that there is lack of clear design, so there are inconsistencies in implementation. That, or this should be user preference.

So I can get some input from UI devs, but I think this would be known issue if not invalid.

Behavior may be wrong or inconsistent, but I am not sure if I would call this a bug. I was looking for duplicates and read through report #71156. To me it sounds that there is lack of clear design, so there are inconsistencies in implementation. That, or this should be user preference. So I can get some input from UI devs, but I think this would be known issue if not invalid.

Germano Cavalcante commented

2020-08-21 04:01:19 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-08-21 04:01:19 +02:00

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

Germano Cavalcante closed this issue

2020-08-21 04:01:19 +02:00

Germano Cavalcante commented

2020-08-21 04:01:19 +02:00

What is happening is that, unlike the box selection that uses drawing, circle and lasso selection only consider the 3d center of the object (without culling).
So, for these modes, it doesn't matter if the non-hidden object is invisible in some way. If the center is within the limits it will be selected.
Differently, the box select considers what is drawn, as the pivot is part of the object, if it is appearing, the object is then considered visible and if it is inside the box it must be selected.

Standardizing the behavior of selection tools is something that has been discussed, see:
#57209 (Circle Select Tool Todo)
#64281 (Option to lasso-select using geometry instead of object centers.)

So this is a known design issue that is already addressed.

What is happening is that, unlike the box selection that uses drawing, circle and lasso selection only consider the 3d center of the object (without culling). So, for these modes, it doesn't matter if the non-hidden object is invisible in some way. If the center is within the limits it will be selected. Differently, the box select considers what is drawn, as the pivot is part of the object, if it is appearing, the object is then considered visible and if it is inside the box it must be selected. Standardizing the behavior of selection tools is something that has been discussed, see: #57209 (Circle Select Tool Todo) #64281 (Option to lasso-select using geometry instead of object centers.) So this is a known design issue that is already addressed.

Eugene Du commented

2020-08-21 08:11:56 +02:00

Thanks for clarification!

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Box Selection with Backface Culling ON does not select Objects backfaced to view #79802