Obj import will error if texture coordinates do not have 2 values #68249

New Issue

Jcw87 · 2019-08-05T08:46:40+02:00

Jcw87 commented

2019-08-05 08:46:40 +02:00

System Information
Operating system: Windows 10 version 1803
Graphics card: NVIDIA GeForce GTX1060 3GB

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e
Worked:

According to the OBJ spec, a texture coordinate is defined by the following:

vt u v w

It also says that v and w are optional, and have a default value of 0.

064c9f30c1/Specs/obj_spec.txt (L330-L348)

I've encountered an OBJ export library that will omit v and w if they are 0. When attempting to import files created by this exporter into blender, the importer throws a python error.

Traceback (most recent call last):

File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\__init__.py", line 145, in execute
  return import_obj.load(context, **keywords)
File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\import_obj.py", line 1243, in load
  dataname,
File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\import_obj.py", line 709, in create_mesh
  me.uv_layers[0].data.foreach_set("uv", loops_uv)

RuntimeError: internal error setting the array

Personally, I don't like that this library will omit the second coordinate, but I can't fault the developer for creating a file that technically follows the spec.

Exact steps for others to reproduce the error

Open blender with the general startup file.
Use the obj importer to import attached file
cube.obj

I cheated a little bit with this file, as I actually exported it from blender, then changed it to match what the other exporter does. It throws the same error.

**System Information** Operating system: Windows 10 version 1803 Graphics card: NVIDIA GeForce GTX1060 3GB **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e Worked: According to the OBJ spec, a texture coordinate is defined by the following: vt u v w It also says that v and w are optional, and have a default value of 0. https://github.com/JeremyAnsel/JeremyAnsel.Media.WavefrontObj/blob/064c9f30c1e013df6d6b5946fd148f63cf974124/Specs/obj_spec.txt#L330-L348 I've encountered an OBJ export library that will omit v and w if they are 0. When attempting to import files created by this exporter into blender, the importer throws a python error. Traceback (most recent call last): ``` File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\__init__.py", line 145, in execute return import_obj.load(context, **keywords) File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\import_obj.py", line 1243, in load dataname, File "C:\Program Files\Blender Foundation\Blender\2.80\scripts\addons\io_scene_obj\import_obj.py", line 709, in create_mesh me.uv_layers[0].data.foreach_set("uv", loops_uv) ``` RuntimeError: internal error setting the array Personally, I don't like that this library will omit the second coordinate, but I can't fault the developer for creating a file that technically follows the spec. **Exact steps for others to reproduce the error** 1. Open blender with the general startup file. 2. Use the obj importer to import attached file [cube.obj](https://archive.blender.org/developer/F7649789/cube.obj) I cheated a little bit with this file, as I actually exported it from blender, then changed it to match what the other exporter does. It throws the same error.

Jcw87 commented

2019-08-05 08:46:40 +02:00

Added subscriber: @Jcw87

Jcw87 changed title from ~~Obj import will error if vertex coordinates do not have 2 values~~ to Obj import will error if texture coordinates do not have 2 values

2019-08-05 09:11:06 +02:00

Philipp Oeser commented

2019-08-05 09:52:08 +02:00

Added subscribers: @mont29, @lichtwerk

Bastien Montagne was assigned by Philipp Oeser

2019-08-05 09:52:08 +02:00

Philipp Oeser commented

2019-08-05 09:52:08 +02:00

Confirmed, should be supported I guess...
@mont29: mind checking?

Confirmed, should be supported I guess... @mont29: mind checking?

blender-admin commented

2019-08-05 15:27:25 +02:00

This issue was referenced by 19166e3172

This issue was referenced by 19166e3172c39a7231bdb885543c9665bbf254cc

Bastien Montagne commented

2019-08-05 15:28:25 +02:00

Changed status from 'Open' to: 'Resolved'

Bastien Montagne closed this issue

2019-08-05 15:28:25 +02:00

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Obj import will error if texture coordinates do not have 2 values #68249