Loading OBJ file from ShapeNet fails

[HanG-94]

Hi simple-3dviz Team,
when i try to load .obj file from ShapeNet using Mesh.from_file("model_normalized.obj") then gives following error:

File ~/miniconda3/lib/python3.10/site-packages/simple_3dviz/io/mesh.py:147, in ObjMeshReader.read..extract_uv(face)
146 def extract_uv(face):
--> 147 return int(face.split("/")[1])-1

ValueError: invalid literal for int() with base 10: ''

The version of simple-3dviz is 0.7.0. The .obj file i list here:
model_normalized.zip

could you please help me out?

Regards,
Han Gao

[HanG-94]

Dear simple-3dviz Team,

i think the obj from ShapeNet.v2 consists of multiple models, which cannot be loaded by Mesh.from_file(). A possible workaround could be using the trimesh.load(file, force='mesh').

Regards,
Han

[paschalidoud]

Hi @HanG-94,

Thanks a lot for using our library. Do you mind sharing the obj file you that causes the ValueError?

Best,
Despi

[GiulioFede]

Go to the lib file: simple_3dviz/io/mesh.py and modify those methods of class ObjMeshReader(MeshReader):

def read(self, filename):
    def extract_vertex(face):
        **if "//" in face:
            return int(face.split("//")[0])-1**
        return int(face.split("/")[0])-1

    def extract_normal(face):
        **if "//" in face:
            return int(face.split("//")[2])-1**
        return int(face.split("/")[2])-1

    def extract_uv(face):
        **if "//" in face:
            return int(face.split("//")[1])-1**
        return int(face.split("/")[1])-1

in ** ** the new parts.