Texture Not Applied Correctly with obj.add_uv_mapping() on Imported Object (Issue Since v2.4.0, Working in v2.3.0)

[glonor]

Describe the issue

The add_uv_mapping() function does not apply the texture mapping as expected when used on an imported object without UV mapping, starting from version 2.4.0 of BlenderProc.

Minimal code example

import blenderproc as bproc

parser = argparse.ArgumentParser()
parser.add_argument('--model', nargs='?', help="Path to the 3D models")
parser.add_argument('--output_dir', nargs='?', help="Path to where the final files will be saved ")
parser.add_argument('--cc_textures_path', nargs='?', help="Path to the cc textures")
args = parser.parse_args()

bproc.init()        
bproc.camera.set_resolution(512, 512)

cc_textures = bproc.loader.load_ccmaterials(args.cc_textures_path)

obj = bproc.loader.load_obj(args.model)[0]

random_cc_texture = cc_textures[1]
obj.add_uv_mapping("smart", True)
obj.replace_materials(random_cc_texture) 

light = bproc.types.Light()
light.set_type("POINT")
light.set_location([5, 5, 5])
light.set_energy(1000)


poi = bproc.object.compute_poi([obj])
camera_location = [3,3,3]
rotation_matrix = bproc.camera.rotation_from_forward_vec(poi - camera_location)
cam2world_matrix = bproc.math.build_transformation_mat(camera_location, rotation_matrix)
bproc.camera.add_camera_pose(cam2world_matrix)

data = bproc.renderer.render()

bproc.writer.write_hdf5(args.output_dir, data)

Files required to run the code

# Cube.obj

# Vertices
v -1.0 -1.0 -1.0
v -1.0 -1.0  1.0
v -1.0  1.0 -1.0
v -1.0  1.0  1.0
v  1.0 -1.0 -1.0
v  1.0 -1.0  1.0
v  1.0  1.0 -1.0
v  1.0  1.0  1.0

# Faces (vertex indices only)
f 1 5 7 3
f 1 2 6 5
f 2 4 8 6
f 4 3 7 8
f 1 3 4 2
f 5 6 8 7

Expected behavior

obj.add_uv_mapping('smart', True) function should successfully apply the texture mapping to the imported object without any issues, as it did in version 2.3.0:

BlenderProc version

2.6.1

[cornerfarmer]

Can you please provide more details. So what code and which object do you use? What do you mean with as expected?

[glonor]

Edit: The original issue has been edited to include additional information.

[cornerfarmer]

Thank you, this makes it way easier to reproduce the bug. Apparently, in some of the recent versions blender switched to not automatically selecting all faces in edit mode. The PR #1003 should fix that. Could you verify that the change fixes your problem?

[glonor]

Yes, I can confirm that the changes in the pull request #1003 have addressed the issue. Thank you.