obj2scratch.py

f = open('dog.obj','r')

verts = []
uvs = []
faces = []

for line in f:
    if line[:2] == 'v ':
        verts.append(tuple(map(lambda s:float(s),line.split()[1:])))
    elif line[:3] == 'vt ':
        uvs.append(tuple(map(lambda s:float(s),line.split()[1:])))
    elif line[:2] == 'f ':
        faces.append(list(map(lambda s:tuple(map(lambda t:int(t),s.split('/'))),line.split()[1:])))

f.close()
print(f"{len(verts)} vertices\n{len(uvs)} tex coords\n{len(faces)} faces")

with open('vertices.txt','w') as verts_file:
    with open('texcoords.txt', 'w') as uvs_file:
        for face in faces:
            for (i, j, k) in face:
                vert = verts[i - 1]
                uv = uvs[j - 1]
                for coord in vert:
                    verts_file.write(f"{coord}\n")
                for coord in uv:
                    uvs_file.write(f"{coord}\n")

print("Written to vertices.txt & texcoords.txt")