Edit Mode - 3D Cursor Snapping not working correctly #55202

New Issue

Julien Kaspar · 2018-05-25T14:54:25+02:00

Julien Kaspar commented

2018-05-25 14:54:25 +02:00

Blender Version
Broken: Blender 2.8 dc26ef081b

Short description of error
Once you start changing a mesh in edit mode the 3D cursor becomes confused on where it is supposed to snap to when left clicking.
Sometimes it snaps on the initial position of the polygons or it instead snaps slightly inside or outside of the surface of the mesh or doesn't snap at all. Once you switch into object mode the snapping works like normal again.
This can already be seen by just going into edit mode on the standard cube, moving/rotating/scaling it in any way and trying to left click on any surface of that cube.

**Blender Version** Broken: Blender 2.8 dc26ef081b9 **Short description of error** Once you start changing a mesh in edit mode the 3D cursor becomes confused on where it is supposed to snap to when left clicking. Sometimes it snaps on the initial position of the polygons or it instead snaps slightly inside or outside of the surface of the mesh or doesn't snap at all. Once you switch into object mode the snapping works like normal again. This can already be seen by just going into edit mode on the standard cube, moving/rotating/scaling it in any way and trying to left click on any surface of that cube.

Julien Kaspar commented

2018-05-25 14:54:25 +02:00

Added subscriber: @JulienKaspar

Bastien Montagne commented

2018-05-25 15:47:41 +02:00

Added subscribers: @brita, @mont29

Bastien Montagne commented

2018-05-25 15:47:41 +02:00

Iirc @brita was working on that operator?

Adam Latchem commented

2018-05-26 21:46:16 +02:00

Added subscriber: @adamlatchem-2

Adam Latchem commented

2018-05-26 21:46:16 +02:00

One solution (allowing the ray cast algorithm to see the edited mesh when available) is:

index 66eaf34865f..d89d425f95b 100644
    - a/source/blender/editors/space_view3d/view3d_edit.c
+++ b/source/blender/editors/space_view3d/view3d_edit.c
@@ -4614,7 +4614,7 @@ void ED_view3d_cursor3d_update(bContext *C, const int mval[2])

                  SCE_SNAP_MODE_FACE,
                  &(const struct SnapObjectParams){
                      .snap_select = SNAP_ALL,

- .use_object_edit_cage = false,
+                           .use_object_edit_cage = true,

                  },
                  mval_fl, &dist_px,
                  cursor_curr->location, ray_no, NULL,```

One solution (allowing the ray cast algorithm to see the edited mesh when available) is: ```diff --git a/source/blender/editors/space_view3d/view3d_edit.c b/source/blender/editors/space_view3d/view3d_edit.c index 66eaf34865f..d89d425f95b 100644 - a/source/blender/editors/space_view3d/view3d_edit.c +++ b/source/blender/editors/space_view3d/view3d_edit.c @@ -4614,7 +4614,7 @@ void ED_view3d_cursor3d_update(bContext *C, const int mval[2]) ``` SCE_SNAP_MODE_FACE, &(const struct SnapObjectParams){ .snap_select = SNAP_ALL, ``` - .use_object_edit_cage = false, + .use_object_edit_cage = true, ``` }, mval_fl, &dist_px, cursor_curr->location, ray_no, NULL,```

Inês Almeida self-assigned this 2018-05-28 19:02:51 +02:00

Campbell Barton commented

2018-06-18 08:59:01 +02:00

Added subscribers: @mano-wii, @ideasman42

Campbell Barton commented

2018-06-18 08:59:01 +02:00

@adamlatchem-2, setting use_object_edit_cage = true doesn't fix the issue. Although I think this is the correct solution, it's just that the option isn't working at the moment.

From looking at the code the editmesh bvh isn't cached, so every time you snap the cursor it will generate a new BVH for all edit-meshes.

@mano-wii could you look into this?

@adamlatchem-2, setting `use_object_edit_cage = true` doesn't fix the issue. Although I think this is the correct solution, it's just that the option isn't working at the moment. From looking at the code the editmesh bvh isn't cached, so every time you snap the cursor it will generate a new BVH for all edit-meshes. @mano-wii could you look into this?

Inês Almeida removed their assignment 2018-07-27 23:08:35 +02:00

Germano Cavalcante was assigned by Inês Almeida

2018-07-27 23:08:35 +02:00

Inês Almeida commented

2018-07-27 23:08:35 +02:00

Re-assigning to mano-wii who is actually doing the work on this one :)

blender-admin commented

2018-10-09 15:23:31 +02:00

This issue was referenced by f81e8903b4

This issue was referenced by f81e8903b407e8faa5f6c78a90bd802bb85fb13e

Germano Cavalcante commented

2018-10-09 15:31:33 +02:00

Changed status from 'Open' to: 'Resolved'

Germano Cavalcante closed this issue

2018-10-09 15:31:33 +02:00

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Edit Mode - 3D Cursor Snapping not working correctly #55202