Add support for smoothing groups

These are auto generated by blender.
Control should be through sharp edges and edge splits.

io_scene_blam/export_model.py

@@ -127,6 +127,8 @@ def write_jms_model(context, filepath,
             # _must_ do this first since it re-allocs arrays
             mesh_triangulate(mesh)
 
+        smoothing_groups, group_count = mesh.calc_smooth_groups()
+
         # Loop triangles
         for poly in mesh.polygons:
             # Vertices
@@ -144,7 +146,7 @@ def write_jms_model(context, filepath,
                     '{0[0]:0.6f}\t{0[1]:0.6f}\n'.format( # uv coordinates
                         mesh.uv_layers.active.data[i].uv
                         ) +
-                    '0\n' # smoothing group
+                    str(smoothing_groups[poly.index]) + '\n' # smoothing group
                     )
 
             # Triangles