Fail to load obj file properly

[tailriver]

How to reproduce:

1. Save obj, mtl and texture files into a directory in an external drive.
2. Start MeshLab by flatpak run net.meshlab.MeshLab.
3. Open obj file in step 1.
4. Got this warning message on dialog and terminal. It seems the mesh is loaded properly but texture is not loaded.

Warning: Error encountered while loading file: "foo.obj" Error details: Some materials definitions were not found, a default white material is used where no material was available
Opened mesh /run/user/1001/doc/4e99b84a/foo.obj in 16044 msec
All files opened in 16049 msec

In this example, /mnt/hdd/mesh/foo.obj is referenced as /run/user/1001/doc/4e99b84a/foo.obj. Next expected step should read /mnt/hdd/mesh/foo.mtl but perhaps it may try to read /run/user/1001/doc/4e99b84a/foo.mtl.

I checked:

• If the files are saved into usual location such as ~/Desktop, there is no problem.
• Making a symbolic link under ~/Documents was not helped.
• This may be caused by some sandbox restriction of flatpak. So I was trying --filesystem=host etc. but couldn't resolve.

OS: Ubuntu 22.04
Flatpak list:

Name          Application ID                   Version Branch     Installation
MeshLab       net.meshlab.MeshLab              2022.02 stable     system
Mesa          …freedesktop.Platform.GL.default 21.3.9  21.08      system
nvidia-525-7… …op.Platform.GL.nvidia-525-78-01         1.4        system
openh264      …g.freedesktop.Platform.openh264 2.1.0   2.0        system
Yaru Gtk The… org.gtk.Gtk3theme.Yaru                   3.22       system
KDE Applicat… org.kde.Platform                         5.15-21.08 system
QGnomePlatfo… …de.PlatformTheme.QGnomePlatform         5.15-21.08 system
QtSNI         org.kde.PlatformTheme.QtSNI              5.15-21.08 system
QGnomePlatfo… …ation.QGnomePlatform-decoration         5.15-21.08 system

Please tell me if this issue should be reported in MeshLab repo.

[kevinsmia1939]

The non-flatpak version work properly right?
Could you share the .obj and .mtl with me?

[tailriver]

@kevinsmia1939 Thank you for quick reply. Apt version cannot open obj files due to cnr-isti-vclab/meshlab#1270. They recommend to use flatpak version.

Sorry I found cnr-isti-vclab/meshlab#1103 while I'm digging upstream repo and you had left comments the issue.

Anyway, this is a simple mesh: hexa.tar.gz

Screenshot on 2022.02 (Mac):

[kevinsmia1939]

It does work if the obj and mtl is under home user folder is that right?