3.1/3.2 wavefront OBJ exporter issues with exporting curves #97095

New Issue

mill mill · 2022-04-06T09:55:25+02:00

mill mill commented

2022-04-06 09:55:25 +02:00

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: cc66d1020c
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]

The WaveFront exporter does not handle curves.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

select a curve object. Then
File > export > wavefront obj > check curves as nurbs > export wavefront obj.
That exports an empty file.

Blender 2.9.3.6 can exports curves correctly.
only 3.1 and 3.2 has this problem.

**System Information** Operating system: Windows-10-10.0.19042-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92 **Blender Version** Broken: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: `cc66d1020c` Worked: (newest version of Blender that worked as expected) **Short description of error** [Please fill out a short description of the error here] The WaveFront exporter does not handle curves. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] select a curve object. Then File > export > wavefront obj > check curves as nurbs > export wavefront obj. That exports an empty file. Blender 2.9.3.6 can exports curves correctly. only 3.1 and 3.2 has this problem.

mill mill commented

2022-04-06 09:55:25 +02:00

Added subscriber: @mill

Omar Emara commented

2022-04-06 10:05:01 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-04-06 10:05:01 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-04-06 10:05:01 +02:00

I can't replicate this issue on a simple Bezier curve. By an empty file, do you mean a literally empty file on the file system or just a file with no contents when imported again. If yes, can you attach that file here?

Philipp Oeser commented

2022-04-06 10:12:54 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-04-06 10:12:54 +02:00

Two things:

If I export a Bezier curve, this will not produce an empty file, but will export a mesh
If I export a Nurbs curve, this will not produce an empty file, but will export a nurbs curve

Is this the behavior you are experiencing?

Two things: - If I export a Bezier curve, this will not produce an empty file, but will export a mesh - If I export a Nurbs curve, this will not produce an empty file, but will export a nurbs curve Is this the behavior you are experiencing?

Aras Pranckevicius commented

2022-04-06 12:40:20 +02:00

Added subscriber: @aras_p

mill mill commented

2022-04-06 14:53:02 +02:00

I was always importing obj files in Maya.
I noticed that the file was not empty.
Just Maya can not import poly and bezier type curves.

	blender ver2.93	blender ver3.1, ver3.2
Maya can import	nurbs, poly	nurbs,

Omar Emara commented

2022-04-06 15:31:09 +02:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Aras Pranckevicius commented

2022-04-06 21:16:19 +02:00

@mill it would be helpful if you could attach a .blend file that shows the issue clearly, as well as indicating which export settings you have used. There are various curve/surface types possible, and various export settings, and so far it's not clear to me which combination is broken.

mill mill commented

2022-04-07 02:32:12 +02:00

I atatched the blend file (ver3.1.2).

This time, exporting bezier curve crashes blender.curves.zip

Yesterday it was not a problem.
I cleared the blender config files before open the file.

Maya2019 only can import nurbs curves.

I atatched the blend file (ver3.1.2). This time, exporting bezier curve crashes blender.[curves.zip](https://archive.blender.org/developer/F12979655/curves.zip) ![settings.jpg](https://archive.blender.org/developer/F12979657/settings.jpg) Yesterday it was not a problem. I cleared the blender config files before open the file. Maya2019 only can import nurbs curves.

Aras Pranckevicius changed title from ~~blender 3.1 and 3.2 wavefront exporter is bloken~~ to 3.1/3.2 wavefront OBJ exporter issues with exporting curves

2022-04-07 05:54:23 +02:00

Aras Pranckevicius self-assigned this 2022-04-07 05:54:23 +02:00

Aras Pranckevicius commented

2022-04-07 05:54:23 +02:00

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

Aras Pranckevicius commented

2022-04-09 18:42:47 +02:00

From what I can tell:

Blender obj exporter could never really export Bezier curves. It was always exporting them as line meshes, both with the pre-3.1 exporter and with the 3.1/3.2 exporter.
The 3.1/3.2 exporter does not export Poly curves at all. That's definitely a bug, I'm fixing it.
The 3.1/3.2 exporter crashes if within a single object you are mixing curves of different types (e.g. have a nurbs curve, and a bezier curve, both as separate segments, but in one object). That's also a bug, I'm fixing that.

I can't reproduce the crash with your attached .blend file though.

From what I can tell: - Blender obj exporter could never really export Bezier curves. It was always exporting them as line meshes, both with the pre-3.1 exporter and with the 3.1/3.2 exporter. - The 3.1/3.2 exporter does not export Poly curves at all. That's definitely a bug, I'm fixing it. - The 3.1/3.2 exporter crashes if within a single object you are mixing curves of different types (e.g. have a nurbs curve, and a bezier curve, both as separate segments, but in one object). That's also a bug, I'm fixing that. I can't reproduce the crash with your attached .blend file though.

Philipp Oeser commented

2022-04-14 11:07:53 +02:00

Since this is partly a regression (and a bug in a new feature): will set to High prio

blender-admin commented

2022-04-17 20:59:55 +02:00

This issue was referenced by a3eb4027c2

This issue was referenced by a3eb4027c2383827b9f5beed709c54c53c7d6d20

Aras Pranckevicius commented

2022-04-17 21:01:09 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Aras Pranckevicius closed this issue

2022-04-17 21:01:09 +02:00

Bastien Montagne added this to the Pipeline, Assets & IO project 2023-02-09 15:40:49 +01:00

Bastien Montagne removed this from the Pipeline, Assets & IO project 2023-02-10 12:49:29 +01:00

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3.1/3.2 wavefront OBJ exporter issues with exporting curves #97095