Measure tool operating incorrectly in Wireframe mode (Windows, multiple Blender versions). #105664

New Issue

Karin-Steffner · 2023-03-11T18:10:34+01:00

Karin-Steffner commented

2023-03-11 18:10:34 +01:00

OS:
Windows 10

Blender Version:
Blender 3.3.4 LTS, 3.4.1 and as well experimental 3.6.0.

When enabling global vertex snapping, in Solid Display, the Measure tool works ok. I can LMB snap to a start vertex and drag to an end vertex, release mouse button and the correct length will be displayed.

However, changing to Wireframe mode (no X-ray), when using the Measure tool, the tool "appears" to behave correctly (same apparent behaviour as in Solid mode), but the start vertex will NOT be snapped to, only the end vertex will.

Attempting to activate snapping using CTRL when using Measure tool (note: with global snapping still on) seem to prohibit snapping (toggles snapping OFF?).

If I turn off global snapping, and instead use CTRL (when using the Measure tool) to activate snapping, then it again appears to snap to the first and last selected vertex. But - in fact - the same problem is present, only the end vertex is snapped to. The start vertex is never snapped to.

Test case: Test on Mesh Cube.

OS: Windows 10 Blender Version: Blender 3.3.4 LTS, 3.4.1 and as well experimental 3.6.0. When enabling global vertex snapping, in Solid Display, the Measure tool works ok. I can LMB snap to a start vertex and drag to an end vertex, release mouse button and the correct length will be displayed. However, changing to *Wireframe mode* (no X-ray), when using the Measure tool, the tool "appears" to behave correctly (same apparent behaviour as in Solid mode), but the start vertex will NOT be snapped to, only the end vertex will. Attempting to activate snapping using CTRL when using Measure tool (note: with global snapping still on) seem to *prohibit* snapping (toggles snapping OFF?). If I *turn off global* snapping, and instead use CTRL (when using the Measure tool) to activate snapping, then it again *appears* to snap to the first and last selected vertex. But - in fact - the same problem is present, only the end vertex is snapped to. The start vertex is never snapped to. Test case: Test on Mesh Cube.

Karin-Steffner added the

labels 2023-03-11 18:10:35 +01:00

Germano Cavalcante commented

2023-03-13 18:10:27 +01:00

Ctrl is a shortcut for "Snap Invert". If toogle is ON, Ctrl inverts turning snapping OFF. If toggle is OFF, Ctrl inverts turning snapping ON. It's by design.

But I noticed apparently undesirable behavior in snap in wireframe mode. Snap to Face prevents snapping to behind elements. This must be the problem you wanted to report and in fact it is a bug.

Investigating...

`Ctrl` is a shortcut for "Snap Invert". If toogle is ON, Ctrl inverts turning snapping OFF. If toggle is OFF, Ctrl inverts turning snapping ON. It's by design. But I noticed apparently undesirable behavior in snap in wireframe mode. Snap to Face prevents snapping to behind elements. This must be the problem you wanted to report and in fact it is a bug. Investigating...

Germano Cavalcante added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-03-13 18:10:37 +01:00

Germano Cavalcante referenced this issue from a commit

2023-03-13 19:33:11 +01:00

Fix 'use_occlusion_test' option not having effect on wireframe

Karin-Steffner commented

2023-03-13 22:46:09 +01:00

I was not aware that Ctrl was meant to invert snapping, I thought Ctrl was meant to enable snapping. But this is not the important issue.

I do not see this as a problem related to "snapping to behind elements". But it could be the same thing?
Consider:
Case tested using Blender 3.4.1:
Starting Blender from scratch, a mesh cube is displayed. Click away splash screen. (We are in now Object mode.)
Activate Wireframe. (I see that X-ray also simultaneously turns on when I hit the Wireframe shading icon.)
Select Measure tool, hold down Ctrl (to allow snapping, and the small ring cursor appears when near cube corners indicating snapping action) and LMB drag from on cube corner to another.
Rotate the cube a little and observe that the measuring line has only snapped to the end cube corner (not the start corner.)
(If I deactivate X-ray, we still have the same issue.)
(If I now Tab into Edit mode, we still have the same issue.)

BTW.
Consider the reporting about simultaneous X-ray activation, stated above:
When having freshly started Blender, X-ray is initially OFF.
When activating Wireframe, then X-ray is also simultaneously toggled ON (without me explicitely hitting the icon).
Note: This happens only the very first time activating Wireframe after Blender startup.
Why this behaviour, seems a bit illogical to me...

I was not aware that Ctrl was meant to *invert* snapping, I thought Ctrl was meant to *enable* snapping. But this is *not* the important issue. I do not see this as a problem related to "snapping to behind elements". But it could be the same thing? Consider: Case tested using Blender 3.4.1: Starting Blender from scratch, a mesh cube is displayed. Click away splash screen. (We are in now Object mode.) Activate Wireframe. (I see that X-ray also simultaneously turns on when I hit the Wireframe shading icon.) Select Measure tool, hold down Ctrl (to allow snapping, and the small ring cursor appears when near cube corners indicating snapping action) and LMB drag from on cube corner to another. Rotate the cube a little and observe that the measuring line has only snapped to the *end* cube corner (not the *start* corner.) (If I deactivate X-ray, we still have the same issue.) (If I now Tab into Edit mode, we still have the same issue.) BTW. Consider the reporting about *simultaneous* X-ray activation, stated above: When having freshly started Blender, X-ray is initially OFF. When activating Wireframe, then X-ray is also *simultaneously* toggled ON (without me explicitely hitting the icon). Note: This happens only the *very first time* activating Wireframe after Blender startup. Why this behaviour, seems a bit illogical to me...

Germano Cavalcante commented

2023-03-15 15:51:32 +01:00

observe that the measuring line has only snapped to the end cube corner (not the start corner.)

I can't understand what you mean.

Note that I still think you are referring to the problem I mentioned in my first comment (about Snap to Face preventing snapping to behind elements).

Note that there has recently been a fix on this (See 98bfa8d458)

Please try the latest daily build: https://builder.blender.org/download/

> observe that the measuring line has only snapped to the end cube corner (not the start corner.) I can't understand what you mean. Note that I still think you are referring to the problem I mentioned in my first comment (about Snap to Face preventing snapping to behind elements). Note that there has recently been a fix on this (See 98bfa8d4589cae47d0b7ae9ff576a9acca91ab88) Please try the latest daily build: https://builder.blender.org/download/

Karin-Steffner commented

2023-03-15 18:45:27 +01:00

I just downloaded and installed the latest daily build for Blender 3.4.1. The problem is still very much present.
It is hard for me to understand why you "can't understand" when you do not explain further, did you try the exact steps I outlined?
Please look at the screen capture enclosed. At the very end I rotated the cube, and you can see that one end of the measurement line did not snap. This is the problem.

I just downloaded and installed the latest daily build for Blender 3.4.1. The problem is still very much present. It is hard for me to understand why you "can't understand" when you do not explain further, did you try the *exact* steps I outlined? Please look at the screen capture enclosed. At the very end I rotated the cube, and you can see that one end of the measurement line did not snap. This is the problem.

2023-03-14 13-14-23.mp4

1.2 MiB

Germano Cavalcante commented

2023-03-15 19:40:01 +01:00

Thanks for the video. I can confirm the problem.

Note that 3.4.1 no longer receives bug fixes. For now the ones receiving fixes are 3.5 or higher or one of the LTS (Long Term Support). See https://projects.blender.org/milestones

Thanks for the video. I can confirm the problem. Note that 3.4.1 no longer receives bug fixes. For now the ones receiving fixes are 3.5 or higher or one of the LTS (Long Term Support). See https://projects.blender.org/milestones

Germano Cavalcante added

and removed

Needs Information from User

labels 2023-03-15 19:40:17 +01:00

Germano Cavalcante referenced this issue from a commit

2023-03-15 21:12:22 +01:00

Fix #105664: measure tool ignoring snap on first click