patch [#30516] OBJ importer run out of memory fix

from Martijn Berger (juicyfruit) 

with some edits for efficient dict access.

io_scene_obj/import_obj.py

@@ -383,7 +383,7 @@ def key_to_name(key):
  faces_split = []
  verts_split = []
  unique_materials_split = {}
- vert_remap = [-1] * len(verts_loc)
+ vert_remap = {}
 
  face_split_dict[key] = (verts_split, faces_split, unique_materials_split, vert_remap)
 
@@ -393,13 +393,13 @@ def key_to_name(key):
 
  # Remap verts to new vert list and add where needed
  for enum, i in enumerate(face_vert_loc_indices):
- if vert_remap[i] == -1:
-  new_index = len(verts_split)
- vert_remap[i] = new_index # set the new remapped index so we only add once and can reference next time.
- face_vert_loc_indices[enum] = new_index # remap to the local index
+ map_index = vert_remap.get(i)
+ if map_index is None:
+ map_index = len(verts_split)
+ vert_remap[i] = map_index # set the new remapped index so we only add once and can reference next time.
  verts_split.append(verts_loc[i]) # add the vert to the local verts
- else:
-  face_vert_loc_indices[enum] = vert_remap[i] # remap to the local index
+
+ face_vert_loc_indices[enum] = map_index # remap to the local index
 
  matname = face[2]
  if matname and matname not in unique_materials_split: