Snapping doesn't work when looking through another object with backface culling #79144

New Issue

slowburn · 2020-07-21T18:40:30+02:00

slowburn commented

2020-07-21 18:40:30 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.13587 Core Profile Context 20.3.1 26.20.15029.15007

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-20 20:08, hash: 731d9f0bfa

Short description of error
When looking through the backside of an object with backface culling enabled, snapping doesn't work on objects that are behind it.

In this example snapping doesn't work on the cube in the right viewport. Although it is still possible to snap to the corners of the plane.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.13587 Core Profile Context 20.3.1 26.20.15029.15007 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-20 20:08, hash: `731d9f0bfa` **Short description of error** When looking through the backside of an object with backface culling enabled, snapping doesn't work on objects that are behind it. ![snap.jpg](https://archive.blender.org/developer/F8711799/snap.jpg) In this example snapping doesn't work on the cube in the right viewport. Although it is still possible to snap to the corners of the plane.

slowburn commented

2020-07-21 18:40:30 +02:00

Added subscriber: @slowburn

Richard Antalik commented

2020-07-22 05:25:15 +02:00

Added subscribers: @mano-wii, @iss

Richard Antalik commented

2020-07-22 05:25:15 +02:00

@mano-wii Should this work or is this feature request?

Germano Cavalcante commented

2020-07-22 14:04:08 +02:00

Added subscriber: @JulienKaspar

Germano Cavalcante commented

2020-07-22 14:04:08 +02:00

The snap system has its own "Backface Culling" option:

I don't remember what the reasons were, but it was intentional.
I have no problem removing that option and matching it to the viewport.

@JulienKaspar, do you remember the reasons for being a separate option?

The snap system has its own "Backface Culling" option: ![image.png](https://archive.blender.org/developer/F8713647/image.png) I don't remember what the reasons were, but it was intentional. I have no problem removing that option and matching it to the viewport. @JulienKaspar, do you remember the reasons for being a separate option?

slowburn commented

2020-07-22 15:38:48 +02:00

I think the option in the snapping menu was added for better retopology workflow - to prevent accidental snapping to backfacing geometry with solid shading. But if "Backface Culling" in enabled in shading menu but disabled in snapping menu, it gets confusing. In my example I can see the cube but can't snap onto the front facing geometry, because the plane in front is treated as a primary snapping target, even though it's technically invisible. So maybe backface culling should be silently enabled for snapping if it is enabled in the shading menu? That would create a more intuitive behaviour.

blender-admin commented

2020-07-22 17:00:02 +02:00

This issue was referenced by 921c95ab5e

This issue was referenced by 921c95ab5e4473f85c74cab3609917c4c2309c6a

Germano Cavalcante commented

2020-07-22 17:00:37 +02:00

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

Germano Cavalcante closed this issue

2020-07-22 17:00:37 +02:00

Germano Cavalcante self-assigned this 2020-07-22 17:00:37 +02:00

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Snapping doesn't work when looking through another object with backface culling #79144