Python Point.select returns unselected points sometimes #83372

New Issue

Sergey Kritskiy · 2020-12-03T18:28:06+01:00

Sergey Kritskiy commented

2020-12-03 18:28:06 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862
Worked: not sure

Short description of error
I'm trying to manipulate selected points of a specific curve via Python but some unselected points act as selected.
I can't seem to find a pattern to recreate this issue with any curve from scratch, but I'm attaching a curve with the issue.

Running the script in the attached .blend file moves two points instead of one, print() (that prints out selected points) prints two selected points even though there only one is selected.
Using a Deselect (Alt+A) command doesn't solve the issue, only iterating through all the points and setting point.select to False with Python does.

Exact steps for others to reproduce the error

Open the attached .blend file, there's one point selected in the curve:
Run the code provided in the file: it moves a selected point by (1,0,0);
Expected result: selected point is moved, console outputs 1 selected point;
Result I'm getting: two points are moved, console outputs 2 selected points:

problem_.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 **Blender Version** Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: `0f45cab862` Worked: not sure **Short description of error** I'm trying to manipulate selected points of a specific curve via Python but some unselected points act as selected. I can't seem to find a pattern to recreate this issue with any curve from scratch, but I'm attaching a curve with the issue. Running the script in the attached `.blend` file moves two points instead of one, `print()` (that prints out selected points) prints two selected points even though there only one is selected. Using a Deselect (`Alt+A`) command doesn't solve the issue, only iterating through all the points and setting `point.select` to `False` with Python does. **Exact steps for others to reproduce the error** - Open the attached .blend file, there's one point selected in the curve: ![image.png](https://archive.blender.org/developer/F9441199/image.png) - Run the code provided in the file: it moves a selected point by `(1,0,0)`; - Expected result: selected point is moved, console outputs 1 selected point; - Result I'm getting: two points are moved, console outputs 2 selected points: ![image.png](https://archive.blender.org/developer/F9441460/image.png) [problem_.blend](https://archive.blender.org/developer/F9441106/problem_.blend)

Sergey Kritskiy commented

2020-12-03 18:28:06 +01:00

Added subscriber: @Sergey-Kritskiy

Sergey Kritskiy changed title from ~~Python Point.select selects wrong points~~ to Python Point.select returns unselected points sometimes

2020-12-03 18:28:56 +01:00

Germano Cavalcante commented

2020-12-08 14:49:48 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2020-12-08 14:49:48 +01:00

Added subscriber: @mano-wii

Himanshi Kalra commented

2020-12-10 22:36:21 +01:00

Added subscriber: @Calra

Himanshi Kalra commented

2020-12-10 22:36:21 +01:00

Insights

very interesting indeed, I did print the point.select for all the points, and it was 'True` to that one point.
not able to reproduce with new geometry.

Edit: Removed comment about being Platform specific

New Info:

If we change the Spline Type from Poly to Beizer, not able to reproduce the error.
If Spline Type -> Nurbs, able to reproduce the error

Note: The Spline Type used in the file is Poly

Insights * very interesting indeed, I did print the `point.select` for all the points, and it was 'True` to that one point. * not able to reproduce with new geometry. Edit: Removed comment about being Platform specific New Info: If we change the Spline Type from Poly to Beizer, not able to reproduce the error. If Spline Type -> Nurbs, able to reproduce the error Note: The Spline Type used in the file is Poly

Sergey Kritskiy commented

2020-12-10 23:13:18 +01:00

Something I wanted to add:

So far I experienced the issue only with curves that had points added with Python subdivide op. Once again, I can't reproduce this all the time but I believe that was the code that was producing these broken curves:

- selects a specific point of a specific spline
- selects next point (point_index + 1)
# subdivide the segment by cuts_number
def add_points(point_index, spline_index, cuts_number, obj):
  bpy.ops.curve.select_all(action='DESELECT')
  spline = obj.data.splines[spline_index]
  spline.points[point_index].select = True
  spline.points[point_index + 1].select = True
  bpy.ops.curve.subdivide(number_cuts=(cuts_number+1))
  bpy.ops.curve.select_all(action='DESELECT')

Something I wanted to add: So far I experienced the issue only with curves that had points added with Python subdivide op. Once again, I can't reproduce this all the time but I believe that was the code that was producing these broken curves: ``` - selects a specific point of a specific spline - selects next point (point_index + 1) # subdivide the segment by cuts_number def add_points(point_index, spline_index, cuts_number, obj): bpy.ops.curve.select_all(action='DESELECT') spline = obj.data.splines[spline_index] spline.points[point_index].select = True spline.points[point_index + 1].select = True bpy.ops.curve.subdivide(number_cuts=(cuts_number+1)) bpy.ops.curve.select_all(action='DESELECT') ```

Sergey Kritskiy commented

2020-12-18 17:52:03 +01:00

Actually, today I once again stumbled upon this issue. However this time I was simple creating new points with extrude (E), no prior script was used. I have no points selected, but if I run a script that prints out selected points, I'm getting a bunch of Trues:

Attaching a scene with a script to print out points:
problem_points.blend

Actually, today I once again stumbled upon this issue. However this time I was simple creating new points with extrude (`E`), no prior script was used. I have no points selected, but if I run a script that prints out selected points, I'm getting a bunch of `True`s: ![image.png](https://archive.blender.org/developer/F9516591/image.png) Attaching a scene with a script to print out points: [problem_points.blend](https://archive.blender.org/developer/F9516589/problem_points.blend)

blender-admin commented

2021-01-06 13:24:45 +01:00

This issue was referenced by 4be9df7692

This issue was referenced by 4be9df7692eb67706e4d013ca3f0727f8a664cc2

blender-admin commented

2021-01-06 13:24:45 +01:00

This issue was referenced by 967cf303f3

This issue was referenced by 967cf303f32fa5a920c34c934d63e0f3c582b886

Campbell Barton commented

2021-01-06 13:32:53 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2021-01-06 13:32:53 +01:00

Campbell Barton self-assigned this 2021-01-06 13:32:53 +01:00

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Python Point.select returns unselected points sometimes #83372