Axis-constrained snapping to an object with Shrinkwrap modifier is broken #99051

New Issue

slowburn · 2022-06-21T13:52:00+02:00

slowburn commented

2022-06-21 13:52:00 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.79

Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691
Worked: ?

Short description of error
Using axis-constrained edge or face snapping onto an object affected by Shrinkwrap modifier is really buggy and will often transform to a wrong location. The object has to be actually deformed by the Shrinkwrap. Edge snapping is broken with 1or 2 axis constrained, while face snapping only with one axis.

snapping_bug.mp4
Exact steps for others to reproduce the error

Use the provided file
Snap to shrinkwrap.blend1

Enable edge or face snapping
Move the cube on 1 or 2 axes
Try snapping onto the subdivided plane

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.79 **Blender Version** Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: `e05e1e3691` Worked: ? **Short description of error** Using axis-constrained edge or face snapping onto an object affected by Shrinkwrap modifier is really buggy and will often transform to a wrong location. The object has to be actually deformed by the Shrinkwrap. Edge snapping is broken with 1or 2 axis constrained, while face snapping only with one axis. [snapping_bug.mp4](https://archive.blender.org/developer/F13212049/snapping_bug.mp4) **Exact steps for others to reproduce the error** Use the provided file [Snap to shrinkwrap.blend1](https://archive.blender.org/developer/F13212045/Snap_to_shrinkwrap.blend1) - Enable edge or face snapping - Move the cube on 1 or 2 axes - Try snapping onto the subdivided plane

slowburn commented

2022-06-21 13:52:00 +02:00

Added subscriber: @slowburn

Pratik Borhade commented

2022-06-22 08:34:44 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-06-22 08:44:47 +02:00

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

Germano Cavalcante commented

2022-06-27 14:35:21 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-06-27 14:35:21 +02:00

Changed status from 'Confirmed' to: 'Archived'

Germano Cavalcante closed this issue

2022-06-27 14:35:21 +02:00

Germano Cavalcante commented

2022-06-27 14:35:21 +02:00

This is not a bug.
Snapping with constraint is done to the intersection with the extent of geometry. See D5608: Transform: Snap to the intersection between the constraint and the geometry
There is a threshold angle for this intersection to be made. In the attached file this threshold has been reached.

If you don't want this behavior, it's best not to snap, as there's not much use snapping to an undefined point of an edge or face.

This is not a bug. Snapping with constraint is done to the intersection with the extent of geometry. See [D5608: Transform: Snap to the intersection between the constraint and the geometry](https://archive.blender.org/developer/D5608) There is a threshold angle for this intersection to be made. In the attached file this threshold has been reached. If you don't want this behavior, it's best not to snap, as there's not much use snapping to an undefined point of an edge or face.

slowburn commented

2022-06-29 20:14:42 +02:00

In that case, could you add a toggle to disable intersection snapping, because it ruins snapping in certain situations that are quite common.

Germano Cavalcante commented

2022-06-29 21:49:35 +02:00

Polluted interface with too many options is something to avoid.
It was decided that for this feature it is better to always keep it active.

For many different cases, this feature has proved more useful than inconvenient.

It is actually more appropriate to disable snapping altogether than snapping to the region closest to an undefined point of a face or edge.

Polluted interface with too many options is something to avoid. It was decided that for this feature it is better to always keep it active. For many different cases, this feature has proved more useful than inconvenient. It is actually more appropriate to disable snapping altogether than snapping to the region closest to an undefined point of a face or edge.

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Axis-constrained snapping to an object with Shrinkwrap modifier is broken #99051