Cursor centering is wrong when the selected vertices distribution is not uniform #65616

New Issue

kursad k · 2019-06-07T20:00:53+02:00

kursad k commented

2019-06-07 20:00:53 +02:00

System Information
Operating system: Win 10
Graphics card: Intel

Blender Version
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-06 00:27, hash: 8b2b79c210, type: Release

Hi

I feel like Cursor to Selected is not making good desicions when centering the cursor. Please see the .blend file and the image for how the issue looks like

Open the blend file
Tab to edit mode
The current selection is there
Press "Shift+S" for cursor menu, then choose "Cursor to selection"

As you see in the image(just after cursor to selection) the cursor is wrongly centered on Y axis

wrong.blend

**System Information** Operating system: Win 10 Graphics card: Intel **Blender Version** Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-06 00:27, hash: 8b2b79c2108b, type: Release Hi I feel like Cursor to Selected is not making good desicions when centering the cursor. Please see the .blend file and the image for how the issue looks like - Open the blend file - Tab to edit mode - The current selection is there - Press "Shift+S" for cursor menu, then choose "Cursor to selection" As you see in the image(just after cursor to selection) the cursor is wrongly centered on Y axis ![blender_yy9WvCpbf9.png](https://archive.blender.org/developer/F7092421/blender_yy9WvCpbf9.png) [wrong.blend](https://archive.blender.org/developer/F7092420/wrong.blend)

kursad k commented

2019-06-07 20:00:53 +02:00

Added subscriber: @kursadk

kursad k commented

2019-06-07 20:24:56 +02:00

I just tested this with Python API, and the issue seems to be the result of the center being calculated by averaging the vert locations. Using bounding box of the selected vertices produces much better middle positioning.

Here is a relevant test code to see the issue. If you use c (averaged locations, enable in the code) for the cursor location, it will be the same as the internal cursor to selection which produces the wrong results when the vertices are not uniformly distributed.

Using Bbox to locate the center seems to be better for these situations.

import bpy
import numpy as np
import bmesh
from mathutils import Vector

C=bpy.context
ob=C.object
m=ob.matrix_world


bm=bmesh.from_edit_mesh(ob.data)


verts=np.array([m@v.co for v in bm.verts if v.select])

l=len(verts)

print("\n"*3)
#print(v_np[:,0].mean(), v_np[:,1].mean(),v_np[:,2].mean() )

x_min = verts[:,0].min()
y_min = verts[:,1].min()
z_min = verts[:,2].min()

x_max = verts[:,0].max()
y_max = verts[:,1].max()
z_max = verts[:,2].max()

c=np.array( [verts[:,0].sum()/l, verts[:,1].sum()/l, verts[:,2].sum()/l] )


print(c)
- AVERAGED POSITIONS
- bpy.context.scene.cursor.location=c

#BOUNDING BOX
bpy.context.scene.cursor.location=Vector( ( (x_min+x_max)/2,
                                        (y_min+y_max)/2,
                                        (z_min+z_max)/2 )
                                        )

I just tested this with Python API, and the issue seems to be the result of the center being calculated by averaging the vert locations. Using bounding box of the selected vertices produces much better middle positioning. Here is a relevant test code to see the issue. If you use `c` (averaged locations, enable in the code) for the cursor location, it will be the same as the internal cursor to selection which produces the wrong results when the vertices are not uniformly distributed. Using Bbox to locate the center seems to be better for these situations. ``` import bpy import numpy as np import bmesh from mathutils import Vector C=bpy.context ob=C.object m=ob.matrix_world bm=bmesh.from_edit_mesh(ob.data) verts=np.array([m@v.co for v in bm.verts if v.select]) l=len(verts) print("\n"*3) #print(v_np[:,0].mean(), v_np[:,1].mean(),v_np[:,2].mean() ) x_min = verts[:,0].min() y_min = verts[:,1].min() z_min = verts[:,2].min() x_max = verts[:,0].max() y_max = verts[:,1].max() z_max = verts[:,2].max() c=np.array( [verts[:,0].sum()/l, verts[:,1].sum()/l, verts[:,2].sum()/l] ) print(c) - AVERAGED POSITIONS - bpy.context.scene.cursor.location=c #BOUNDING BOX bpy.context.scene.cursor.location=Vector( ( (x_min+x_max)/2, (y_min+y_max)/2, (z_min+z_max)/2 ) ) ```

kursad k changed title from ~~Wrong cursor centering on Y axis~~ to Cursor centering is wrong when the selected vertices distribution is not uniform

2019-06-08 18:45:18 +02:00

Sebastian Parborg commented

2019-06-14 14:25:37 +02:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-06-14 14:25:37 +02:00

Changed status from 'Open' to: 'Archived'

Sebastian Parborg closed this issue

2019-06-14 14:25:37 +02:00

Sebastian Parborg self-assigned this 2019-06-14 14:25:37 +02:00

Sebastian Parborg commented

2019-06-14 14:25:37 +02:00

This is not a but. This is how it is programmed to work. So this is a feature request and should go to: https://blender.community/c/rightclickselect/

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Cursor centering is wrong when the selected vertices distribution is not uniform #65616