Sculpt Mode Transform Pivot #118250

New Issue

Julien Kaspar · 2024-02-14T10:51:28+01:00

Julien Kaspar commented

2024-02-14 10:51:28 +01:00

This task is an updated version and replacement of #80392.

The prevailing issues is that the SculptSession pivot in sculpt mode is

Not persistent (#110616)
Difficult to manually position
Not forced as the default (Other pivot options can be accessed and currently lead to bugs)

3D Cursor as replacement for SculptSession Pivot

We discussed that it would be the best route to exclusively use the 3D Cursor in sculpt mode as the only transform pivot. All other pivot point options and the pie menu on Period need to be disabled in this mode.
This will allow the pivot to be consistent across multiple sessions and scene objects.

Ideally the Orientation will also be locked on "Cursor" while in sculpt mode with the pie menu shortcut on Comma disabled as well.
Orientation settings from Transform Tools need to be hidden in sculpt mode.

A special behavior in sculpt mode is that the 3D Cursor must be transformed together with the geometry to make sure the pivot and orientation intuitively updates.
The Expand operators also need to reposition the 3D Cursor instead of the SculptSession pivot (If this should only happens while a transform tool is active or always needs to be tested).

The view3d.cursor3d operator needs to be assigned to the shortcut Shift RMB in sculpt mode instead of sculpt.set_pivot_position. An additional transform.translate operation for the 3D cursor when click & drag is used is also needed (Same as object and edit mode).

Tool setting to only transform the pivot

A followup step is to add the option to only transform the 3D cursor pivot with the tools.
For now this kind of option is only needed for sculpt mode to fine tweak the cursor without Shift RMB. An old patch already started the work:
D9540: Sculpt: Option to transform only the sculpt pivot

This task is an updated version and replacement of #80392. The prevailing issues is that the SculptSession pivot in sculpt mode is - Not persistent (#110616) - Difficult to manually position - Not forced as the default (Other pivot options can be accessed and currently lead to bugs) ### 3D Cursor as replacement for SculptSession Pivot ![image](/attachments/91af8dcd-b183-4b1c-bb2a-8bd52baff87f) We discussed that it would be the best route to exclusively use the 3D Cursor in sculpt mode as the only transform pivot. All other pivot point options and the pie menu on `Period` need to be disabled in this mode. This will allow the pivot to be consistent across multiple sessions and scene objects. Ideally the Orientation will also be locked on "Cursor" while in sculpt mode with the pie menu shortcut on `Comma` disabled as well. Orientation settings from Transform Tools need to be hidden in sculpt mode. ![image](/attachments/99cc79a7-0502-48d2-b188-ef84bdfced82) A special behavior in sculpt mode is that the 3D Cursor must be transformed together with the geometry to make sure the pivot and orientation intuitively updates. The Expand operators also need to reposition the 3D Cursor instead of the SculptSession pivot (If this should only happens while a transform tool is active or always needs to be tested). The `view3d.cursor3d` operator needs to be assigned to the shortcut `Shift RMB` in sculpt mode instead of `sculpt.set_pivot_position`. An additional `transform.translate` operation for the 3D cursor when click & drag is used is also needed (Same as object and edit mode). ### Tool setting to only transform the pivot A followup step is to add the option to only transform the 3D cursor pivot with the tools. For now this kind of option is only needed for sculpt mode to fine tweak the cursor without `Shift RMB`. An old patch already started the work: [D9540: Sculpt: Option to transform only the sculpt pivot](https://archive.blender.org/developer/D9540)

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Julien Kaspar added the

Module

Sculpt, Paint & Texture

Type

To Do

labels 2024-02-14 10:51:29 +01:00

Julien Kaspar added this to the Sculpt, Paint & Texture project 2024-02-14 10:51:31 +01:00

Julien Kaspar referenced this issue

2024-02-14 10:53:19 +01:00

Sculpt Mode Transform Tool improvements #80392

Nika Kutsniashvili commented

2024-02-14 14:07:40 +01:00

Really glad we're going with 3D cursor. It would make sense to have other options such as Mask Edge and etc. on (.) Shortcut as modes and 3D cursor becomes another mode you can choose. It will make very consistent with object and edit modes

TheRedWaxPolice commented

2024-02-14 15:44:32 +01:00

Really glad we're going with 3D cursor.

That sounds like a bad move to me, tbh...

I'd go with the industry standard way of doing this, which is by transforming the gizmo itself only (like Dobarro was doing). That is intuitive imo... No need to involve anything else in the pivot manipulation process...

Also this seems to add yet another meaning to the 3d cursor, and make it be something that it was never meant to be... In sculpt mode the 3d cursor will be something different from the rest of blender, which is not good..

Like: the 3D Cursor must be transformed together with the geometry The moment this starts happening, that's not a 3d cursor anymore, that's something else...

So, besides confusion, I don't see any advantage in associating the 3d cursor with the pivot...

> Really glad we're going with 3D cursor. That sounds like a bad move to me, tbh... I'd go with the industry standard way of doing this, which is by transforming the gizmo itself only (like Dobarro was doing). That is intuitive imo... No need to involve anything else in the pivot manipulation process... Also this seems to add yet another meaning to the 3d cursor, and make it be something that it was never meant to be... In sculpt mode the 3d cursor will be something different from the rest of blender, which is not good.. Like: `the 3D Cursor must be transformed together with the geometry` The moment this starts happening, that's not a 3d cursor anymore, that's something else... So, besides confusion, I don't see any advantage in associating the 3d cursor with the pivot...

Julien Kaspar commented

2024-02-14 16:34:54 +01:00

@TheRedWaxPolice

So, besides confusion, I don't see any advantage in associating the 3d cursor with the pivot...

The primary goal is to make the pivot work intuitively. That could be done with either a unique pivot for sculpt mode or the 3D cursor.
The advantage for using the 3D cursor is a persistent pivot across all objects and after reloading the file.

If there are arguments against the 3D Cursor, where using it would lead to issues or confusion, then that's important to talk about.

Also this seems to add yet another meaning to the 3d cursor

Not really. The 3D cursor can be used as a pivot already. It's very much in line with how Blender works. It's not that much of a stretch to use the 3D cursor for this purpose in sculpt mode.

by transforming the gizmo itself

This is part of the task, yes. Having this as an option is very useful. The alternative will be to use Shift RMB to place, orient and drag the pivot.

@TheRedWaxPolice > So, besides confusion, I don't see any advantage in associating the 3d cursor with the pivot... The primary goal is to make the pivot work intuitively. That could be done with either a unique pivot for sculpt mode or the 3D cursor. The advantage for using the 3D cursor is a persistent pivot across all objects and after reloading the file. If there are arguments against the 3D Cursor, where using it would lead to issues or confusion, then that's important to talk about. > Also this seems to add yet another meaning to the 3d cursor Not really. The 3D cursor can be used as a pivot already. It's very much in line with how Blender works. It's not that much of a stretch to use the 3D cursor for this purpose in sculpt mode. > by transforming the gizmo itself This is part of the task, yes. Having this as an option is very useful. The alternative will be to use `Shift RMB` to place, orient and drag the pivot.

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