FBX IO: fix related to T44386: do not add again and again same material to a mesh on import.

Issue here is that FBX assigns materials by objects, while in Blender it is by default assigned
to meshes (obdata). This becomes critical with tons of objects using the same mesh (as generated
e.g. by exporting from Blender's dupliobjects).

We may add an option later to assign materials to objects too, but meh... We already have tons
of options in FBX. :|

Also, added some timing/steps reporting in console, helps seeing io process going on,
and spotting stupid issues like this one!

1 files changed, 51 insertions, 0 deletions

diff --git a/io_scene_fbx/fbx_utils.py b/io_scene_fbx/fbx_utils.py
index 07e4d824..65ab2470 100644
--- a/io_scene_fbx/fbx_utils.py
+++ b/io_scene_fbx/fbx_utils.py
@@ -22,6 +22,7 @@
 
 
 import math
+import time
 
 from collections import namedtuple, OrderedDict
 from collections.abc import Iterable
@@ -147,6 +148,56 @@ FBX_FRAMERATES = (
 
 # ##### Misc utilities #####
 
+DO_PERFMON = True
+
+if DO_PERFMON:
+    class PerfMon():
+        def __init__(self):
+            self.level = -1
+            self.ref_time = []
+
+        def level_up(self, message=""):
+            self.level += 1
+            self.ref_time.append(None)
+            if message:
+                print("\t" * self.level, message, sep="")
+
+        def level_down(self, message=""):
+            if not self.ref_time:
+                if message:
+                    print(message)
+                return
+            ref_time = self.ref_time[self.level]
+            print("\t" * self.level,
+                  "\tDone (%f sec)\n" % ((time.process_time() - ref_time) if ref_time is not None else 0.0),
+                  sep="")
+            if message:
+                print("\t" * self.level, message, sep="")
+            del self.ref_time[self.level]
+            self.level -= 1
+
+        def step(self, message=""):
+            ref_time = self.ref_time[self.level]
+            curr_time = time.process_time()
+            if ref_time is not None:
+                print("\t" * self.level, "\tDone (%f sec)\n" % (curr_time - ref_time), sep="")
+            self.ref_time[self.level] = curr_time
+            print("\t" * self.level, message, sep="")
+else:
+    class PerfMon():
+        def __init__(self):
+            pass
+
+        def level_up(self, message=""):
+            pass
+
+        def level_down(self, message=""):
+            pass
+
+        def step(self, message=""):
+            pass
+
+
 # Note: this could be in a utility (math.units e.g.)...
 
 UNITS = {