allow vertex properties with one element

trimesh/exchange/load.py

@@ -575,6 +575,7 @@ def parse_file_args(file_obj,
     # if we still have no resolver try using file_obj name
     if (resolver is None and
         hasattr(file_obj, 'name') and
+        file_obj.name is not None and
             len(file_obj.name) > 0):
         resolver = visual.resolvers.FilePathResolver(file_obj.name)
 

trimesh/exchange/obj.py

@@ -510,7 +510,7 @@ def _parse_vertices(text):
             for k, v in starts.items() if v >= 0}
 
     # count the number of data values per row on a sample row
-    per_row = {k: len(v[1].split()) for k, v in data.items()}
+    per_row = {k: len(v[0].split()) for k, v in data.items()}
 
     # convert data values into numpy arrays
     result = collections.defaultdict(lambda: None)

trimesh/path/path.py

@@ -102,11 +102,10 @@ def __repr__(self):
         """
         Print a quick summary of the number of vertices and entities.
         """
-        r = '<trimesh.{}(vertices.shape={}, len(entities)={})>'.format(
+        return '<trimesh.{}(vertices.shape={}, len(entities)={})>'.format(
             type(self).__name__,
             self.vertices.shape,
             len(self.entities))
-        return r
 
     def process(self):
         """
@@ -124,7 +123,8 @@ def vertices(self):
 
     @vertices.setter
     def vertices(self, values):
-        self._vertices = caching.tracked_array(values, dtype=np.float64)
+        self._vertices = caching.tracked_array(
+            values, dtype=np.float64)
 
     @property
     def entities(self):