FBX Exporter: Most loose edges export as one connected polygon #103946

New Issue

Mysteryem · 2023-01-17T18:34:10+01:00

Mysteryem commented

2023-01-17 18:34:10 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94

Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: blender/blender@55485cb379
Worked:

Short description of error
Exporting a mesh with loose edges (with the option to export loose edges enabled) will connect together just under half of the loose edges into one polygon with many sides. This happens because only half of the required number of 'loop starts' are added for the 2-sided polygons added for loose edges. len(t_le) in https://developer.blender.org/diffusion/BA/browse/master/io_scene_fbx/export_fbx_bin.py$905 should be len(t_le) * 2. Since each 'loop start' is also used to indicate that the previous polygon ends at the previous index, the latter half of the loops get interpreted as one polygon.

Exact steps for others to reproduce the error

Create a mesh with 2 or more loose edges
Export as FBX with Geometry>Loose Edges enabled

Import the exported FBX and compare (you may need to go into edit mode for the loose edges to become visible)

Alternatively a .blend file containing a mesh with quad and 6 loose edges is attached, as well as the .fbx created by exporting it with the Loose Edges option enabled and the expected .fbx created by modifying the code to use len(t_le) * 2.
FBXLooseEdgesTest.blend

FBXLooseEdgesTest6.fbx

FBXLooseEdgesTest6_expected.fbx

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94 **Blender Version** Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: `blender/blender@55485cb379` Worked: **Short description of error** Exporting a mesh with loose edges (with the option to export loose edges enabled) will connect together just under half of the loose edges into one polygon with many sides. This happens because only half of the required number of 'loop starts' are added for the 2-sided polygons added for loose edges. `len(t_le)` in https://developer.blender.org/diffusion/BA/browse/master/io_scene_fbx/export_fbx_bin.py$905 should be `len(t_le) * 2`. Since each 'loop start' is also used to indicate that the previous polygon ends at the previous index, the latter half of the loops get interpreted as one polygon. **Exact steps for others to reproduce the error** - Create a mesh with 2 or more loose edges - Export as FBX with Geometry>Loose Edges enabled # Import the exported FBX and compare (you may need to go into edit mode for the loose edges to become visible) Alternatively a .blend file containing a mesh with quad and 6 loose edges is attached, as well as the .fbx created by exporting it with the Loose Edges option enabled and the expected .fbx created by modifying the code to use `len(t_le) * 2`. [FBXLooseEdgesTest.blend](https://archive.blender.org/developer/F14159683/FBXLooseEdgesTest.blend) ![image.png](https://archive.blender.org/developer/F14159685/image.png) [FBXLooseEdgesTest6.fbx](https://archive.blender.org/developer/F14159682/FBXLooseEdgesTest6.fbx) ![image.png](https://archive.blender.org/developer/F14159687/image.png) [FBXLooseEdgesTest6_expected.fbx](https://archive.blender.org/developer/F14159738/FBXLooseEdgesTest6_expected.fbx)

Mysteryem commented

2023-01-17 18:34:10 +01:00

Added subscriber: @Mysteryem-2

Germano Cavalcante commented

2023-01-19 16:29:28 +01:00

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

Germano Cavalcante commented

2023-01-19 16:29:28 +01:00

Added subscriber: @mano-wii

blender-admin commented

2023-01-23 15:39:34 +01:00

This issue was referenced by a8ffea50ed

This issue was referenced by a8ffea50ed75e3490a99c79007ae21f9b7932595

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FBX Exporter: Most loose edges export as one connected polygon #103946

Import the exported FBX and compare (you may need to go into edit mode for the loose edges to become visible)