Bool tool slice does not always give correct slicing result. #108953

New Issue

anson-liu · 2023-06-14T00:07:27+02:00

anson-liu commented

2023-06-14 00:07:27 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41

Blender Version
Broken: version: 2.93.18, branch: master, commit date: 2023-05-22 12:04, hash: cb886aba06d5.
Broken: version: 3.5.1
Worked: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7

Short description of error
Boolean slicing does not work correctly after Blender version 2.90.1. The slice which is a boolean difference that keeps both sides of the boolean is triggered through the Blender included Bool Tool addon and the bool tool addon code has not had any real changes since 2020-09-23 the date of last working Blender version 2.90.1 commit.

The "slice" code in the Bool Tool addon is at object_boolean_tools.py#L504 and does not appear to have any implementation changes since 2020 so I think Blender 2.93.18 and later had a breaking change in how boolean intersection and differences are handled. The addon calls a boolean difference and a boolean intersect operation. Based on the behavior and screenshot below, I think the Blender returned objects from difference and intersect have changed since 2.90.1.

The incorrect slice operation example is in the screenshot below. Slicing with a curve that was converted to a mesh results in one side of the sliced object staying and the other half turning into a thin intersection piece with the mesh. No UI console errors are shown.

The correct result that works in Blender v2.90.1 is in the screenshot below. The slice operation outputs two objects which are the two sides of the sliced object.

Exact steps for others to reproduce the error

Enable Bool Tool addon
Add a path, move it into place to bisect the object, extrude it, convert it to mesh
Select path that is now a mesh
Shift select the object to be sliced in the 3d view
Use bool tool Slice under right sidebar > Edit >Bool Tool > Auto Boolean> Slice
Wait a few seconds and see result of the slice if it is two sides of the sliced object (or not)

I have attached a test case blend file in 7z archive with a curve and converted mesh and test object to slice that succeeds in Blender 2.90.1 but not 2.93.18 or 3.5.1

I previously made a bug report on the blender addon repo blender/blender-addons#104690 but since the addon itself seems stable and has not changed since 2020, I thought making a bug report in the blender repo may more relevant. Thanks.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41 **Blender Version** Broken: version: 2.93.18, branch: master, commit date: 2023-05-22 12:04, hash: `cb886aba06d5`. Broken: version: 3.5.1 Worked: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `rB3e85bb34d0d7` **Short description of error** Boolean slicing does not work correctly after Blender version 2.90.1. The slice which is a boolean difference that keeps both sides of the boolean is triggered through the Blender included Bool Tool addon and the bool tool addon code has not had any real changes since 2020-09-23 the date of last working Blender version 2.90.1 commit. The "slice" code in the Bool Tool addon is at [object_boolean_tools.py#L504](https://github.com/blender/blender-addons/blob/main/object_boolean_tools.py#L504) and does not appear to have any implementation changes since 2020 so I think Blender 2.93.18 and later had a breaking change in how boolean intersection and differences are handled. The addon calls a boolean difference and a boolean intersect operation. Based on the behavior and screenshot below, I think the Blender returned objects from difference and intersect have changed since 2.90.1. The incorrect slice operation example is in the screenshot below. Slicing with a curve that was converted to a mesh results in one side of the sliced object staying and the other half turning into a thin intersection piece with the mesh. No UI console errors are shown. ![incorrect](/attachments/51f7935a-7973-47f6-8331-bd8dfa87b500) The correct result that works in Blender v2.90.1 is in the screenshot below. The slice operation outputs two objects which are the two sides of the sliced object. ![correct](/attachments/f08aea8a-0fbc-445d-ade3-3d66567e8c2d) **Exact steps for others to reproduce the error** 1. Enable Bool Tool addon 2. Add a path, move it into place to bisect the object, extrude it, convert it to mesh 3. Select path that is now a mesh 4. Shift select the object to be sliced in the 3d view 5. Use bool tool Slice under right sidebar > Edit >Bool Tool > Auto Boolean> Slice 6. Wait a few seconds and see result of the slice if it is two sides of the sliced object (or not) I have attached a test case blend file in 7z archive with a curve and converted mesh and test object to slice that succeeds in Blender 2.90.1 but not 2.93.18 or 3.5.1 I previously made a bug report on the blender addon repo https://projects.blender.org/blender/blender-addons/issues/104690 but since the addon itself seems stable and has not changed since 2020, I thought making a bug report in the blender repo may more relevant. Thanks.

WA_slice_test.7z

23 MiB

anson-liu added the

labels 2023-06-14 00:07:28 +02:00

YimingWu added the