Snap Cursor to Selected (Edit Mode) : lack of control and hidden functionalities #52355

New Issue

ChameleonScales · 2017-08-11T16:55:52+02:00

ChameleonScales commented

2017-08-11 16:55:52 +02:00

Blender Version
Broken: all versions up to 2.79 RC2

Short description of error

In Edit Mode, when the pivot point is set to Median Point, the Snap Cursor to Selected operator uses the medians of the vertices. When the pivot point is set to Bounding Box Center, the cursor snaps to the bounding box. However, the confusing thing is that we would then expect this operator to be influenced by the Pivot Point setting (e.g. when set to Active Element it would snap to the active element), but that's not the case. Only Median Point has an influence on it. All the other settings result in snapping to the bounding box center. Of course there's the Snap Cursor to Active operator but then why not have a Cursor to Median operator ?

⁪⁪⁪⁪‪‪⁪⁯⁯⁯⁯ ‏‏‏
STEPS TO REPRODUCE

Open this file : Snap Cursor inconsistency.blend

set Pivot Point to Median Point
do Shift+S > Cursor to Selected : it uses the median
set Pivot Point to Bounding Box Center
do Shift+S > Cursor to Selected : it uses the bounding box
set Pivot to Active Element
do Shift+S > Cursor to Selected : it uses the bounding box

be confused

And there's more.
When the Pivot point is set to Bounding Box, the pivot goes on the object-space bounding box, but the 3D cursor snaps to the world-space bounding box, not letting you any choice.

in Object Mode, Rotate the object on X by -30 and on Z by -30
in Edit Mode, while Pivot Point is set to Bounding Box, snap the Cursor to Selected : it's not on the same spot as the Pivot because the Pivot is in object-space.

PROPOSAL

In the Pivot Point dropdown, have a choice between world-space and object-space Bounding Box
then when snapping Cursor to Selected, add Tool Shelf dropdown options :
- Median
- Bounds (World)
- Bounds (Object)

and make Median be the default when the Pivot Point is set to Median, World Bounds be the default when the Pivot is set to World Bounds, etc... so we have full control, no hidden functionality and no confusion.

**Blender Version** Broken: all versions up to 2.79 RC2 **Short description of error** In Edit Mode, when the pivot point is set to ***Median Point***, the ***Snap Cursor to Selected*** operator uses the medians of the vertices. When the pivot point is set to ***Bounding Box Center***, the cursor snaps to the bounding box. However, the confusing thing is that we would then expect this operator to be influenced by the Pivot Point setting (e.g. when set to ***Active Element*** it would snap to the active element), but that's not the case. Only ***Median Point*** has an influence on it. All the other settings result in snapping to the bounding box center. Of course there's the ***Snap Cursor to Active*** operator but then why not have a ***Cursor to Median*** operator ? ⁪⁪⁪⁪‪‪⁪⁯⁯⁯⁯ ‏‏‏ **STEPS TO REPRODUCE** Open this file : [Snap Cursor inconsistency.blend](https://archive.blender.org/developer/F707346/Snap_Cursor_inconsistency.blend) - set Pivot Point to Median Point - do Shift+S > Cursor to Selected : it uses the median - set Pivot Point to Bounding Box Center - do Shift+S > Cursor to Selected : it uses the bounding box - set Pivot to Active Element - do Shift+S > Cursor to Selected : it uses the bounding box # be confused And there's more. When the Pivot point is set to ***Bounding Box***, the pivot goes on the object-space bounding box, but the 3D cursor snaps to the world-space bounding box, not letting you any choice. - in Object Mode, Rotate the object on X by -30 and on Z by -30 - in Edit Mode, while Pivot Point is set to ***Bounding Box***, snap the Cursor to Selected : it's not on the same spot as the Pivot because the Pivot is in object-space. **PROPOSAL** - In the Pivot Point dropdown, have a choice between world-space and object-space Bounding Box - then when snapping ***Cursor to Selected***, add Tool Shelf dropdown options : - Median - Bounds (World) - Bounds (Object) and make ***Median*** be the default when the Pivot Point is set to ***Median***, ***World Bounds*** be the default when the Pivot is set to ***World Bounds***, etc... so we have full control, no hidden functionality and no confusion.

ChameleonScales commented

2017-08-11 16:55:52 +02:00

Changed status to: 'Open'

ChameleonScales commented

2017-08-11 16:55:52 +02:00

Added subscriber: @ChameleonScales

ChameleonScales commented

2017-08-11 17:27:06 +02:00

This comment was removed by @ChameleonScales

*This comment was removed by @ChameleonScales*

ChameleonScales commented

2017-08-11 20:04:04 +02:00

This comment was removed by @ChameleonScales

*This comment was removed by @ChameleonScales*

ChameleonScales changed title from ~~Inconsistency in Snap Cursor operators~~ to Inconsistency in Snap Cursor operators (Edit Mode)

2017-08-12 01:16:12 +02:00

Dalai Felinto commented

2017-08-29 11:34:04 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2017-08-29 11:34:04 +02:00

I can reproduce this. It seems more like a design issue than a(n implementation) bug.

ronan ducluzeau commented

2017-09-02 14:01:47 +02:00

Added subscriber: @zeauro

ronan ducluzeau commented

2017-09-02 14:01:47 +02:00

I agree it is a design discussion. But I don't see a real issue.
A user that doesn't know this behaviour will expect Snap Cursor to Selected to be restricted to one option.
But it is a plus to have choïce between Median of selected elements or Bounding Box Center of selection.
Option could be explicit. A checkbox option added to choose for this case would be sufficient to disconnect the operator from pivot point.

But it makes no sense to create a Cursor to Pivot Point operator. A confusion would be added by existence of pivot points that are making no sense for that action.
What would be the expected behaviour of a Snap Cursor to Cursor or a Snap Cursor to Individual Origins ?

And it is probably the reason why these irrelevant pivot points correspond to a default : Bounding Box Center.
They are making no sense for a snap cursor to selected operation and a solution is already provided for snap to active.

The object space bounding box for selection in edit mode can be seen as a user request.
It is probably something to add to brita's User Coordinate Spaces project.
https://developer.blender.org/T43964

I agree it is a design discussion. But I don't see a real issue. A user that doesn't know this behaviour will expect Snap Cursor to Selected to be restricted to one option. But it is a plus to have choïce between Median of selected elements or Bounding Box Center of selection. Option could be explicit. A checkbox option added to choose for this case would be sufficient to disconnect the operator from pivot point. But it makes no sense to create a Cursor to Pivot Point operator. A confusion would be added by existence of pivot points that are making no sense for that action. What would be the expected behaviour of a Snap Cursor to Cursor or a Snap Cursor to Individual Origins ? And it is probably the reason why these irrelevant pivot points correspond to a default : Bounding Box Center. They are making no sense for a snap cursor to selected operation and a solution is already provided for snap to active. The object space bounding box for selection in edit mode can be seen as a user request. It is probably something to add to brita's User Coordinate Spaces project. https://developer.blender.org/T43964

ChameleonScales commented

2017-09-02 15:54:27 +02:00

You made some good points. I update my proposal :

In the Pivot Point dropdown, we could still have the additional choice between World and Object-Space Bounding Box
then when snapping "Cursor to Selected", we could have Tool Shelf dropdown options such as : Median ; Bounds (World) and Bounds (Object) and make Median be the default when the Pivot Point is set to Median, World Bounds be the default when the Pivot is set to world bounds, etc... so we have full control, no hidden functionality, no additional item when hitting Shift+S and no confusion.

Does this work for you ?

You made some good points. I update my proposal : - In the Pivot Point dropdown, we could still have the additional choice between World and Object-Space Bounding Box - then when snapping "Cursor to Selected", we could have Tool Shelf dropdown options such as : Median ; Bounds (World) and Bounds (Object) and make Median be the default when the Pivot Point is set to Median, World Bounds be the default when the Pivot is set to world bounds, etc... so we have full control, no hidden functionality, no additional item when hitting Shift+S and no confusion. Does this work for you ?

ronan ducluzeau commented

2017-09-02 21:28:01 +02:00

Yes. As is, it works. But, imho, it is a design task to archived as a todo.
It is weird to make such kind of changes at the end of a series.
There are probably other things that could benefit of an object space rather than global one.
Maybe your proposal would not stay relevant when this part of Blender would be reviewed by 2.8 project.

Yes. As is, it works. But, imho, it is a design task to archived as a todo. It is weird to make such kind of changes at the end of a series. There are probably other things that could benefit of an object space rather than global one. Maybe your proposal would not stay relevant when this part of Blender would be reviewed by 2.8 project.

ChameleonScales commented

2017-09-02 23:16:56 +02:00

I haven't heard of a planned change in the behavior of the 3D cursor for 2.8 but I'm not involved enough to know. You probably know better, so, do as you wish

ChameleonScales changed title from ~~Inconsistency in Snap Cursor operators (Edit Mode)~~ to Snap Cursor to Selected (Edit Mode) : lack of control and hidden functionalities

2017-09-03 12:28:47 +02:00

Sergey Sharybin commented

2017-09-13 13:48:01 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2017-09-13 13:48:01 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2017-09-13 13:48:01 +02:00

Sergey Sharybin self-assigned this 2017-09-13 13:48:01 +02:00

Sergey Sharybin commented

2017-09-13 13:48:01 +02:00

Thanks for the report, but it's simply how Blender works. Improvements are possible, but bug tracker is not the place to discuss such changes. Use bf-funboard mailing list for that and get someone to implement good proposal or submit a patch here :)

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Snap Cursor to Selected (Edit Mode) : lack of control and hidden functionalities #52355

be confused