[Bf-extensions-cvs] [bea6ca0c] master: Fix T55022: [fbx] when enable use tangent space , it's throw bug.

[Bastien Montagne]

Commit: bea6ca0c4ef8b838ab6d2bc63136b52eb3ffc63c
Author: Bastien Montagne
Date:   Sun Aug 5 19:13:35 2018 +0200
Branches: master
https://developer.blender.org/rBAbea6ca0c4ef8b838ab6d2bc63136b52eb3ffc63c

Fix T55022: [fbx] when enable use tangent space ,it's throw bug.

calculating tangent for some reasons recompute mesh' UV layers, so we
cannot use iterators on those...

===================================================================

M	io_scene_fbx/__init__.py
M	io_scene_fbx/export_fbx_bin.py

===================================================================

diff --git a/io_scene_fbx/__init__.py b/io_scene_fbx/__init__.py
index 9611cb1f..920ddc4c 100644
--- a/io_scene_fbx/__init__.py
+++ b/io_scene_fbx/__init__.py
@@ -21,7 +21,7 @@
 bl_info = {
     "name": "FBX format",
     "author": "Campbell Barton, Bastien Montagne, Jens Restemeier",
-    "version": (3, 9, 1),
+    "version": (3, 9, 2),
     "blender": (2, 79, 1),
     "location": "File > Import-Export",
     "description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",
diff --git a/io_scene_fbx/export_fbx_bin.py b/io_scene_fbx/export_fbx_bin.py
index b75a8977..2df62e3f 100644
--- a/io_scene_fbx/export_fbx_bin.py
+++ b/io_scene_fbx/export_fbx_bin.py
@@ -1023,9 +1023,11 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
             if tspacenumber:
                 t_ln = array.array(data_types.ARRAY_FLOAT64, (0.0,)) * len(me.loops) * 3
                 # t_lnw = array.array(data_types.ARRAY_FLOAT64, (0.0,)) * len(me.loops)
+                uv_names = [uvlayer.name for uvlayer in me.uv_layers]
+                for name in uv_names:
+                    me.calc_tangents(name)
                 for idx, uvlayer in enumerate(me.uv_layers):
                     name = uvlayer.name
-                    me.calc_tangents(name)
                     # Loop bitangents (aka binormals).
                     # NOTE: this is not supported by importer currently.
                     me.loops.foreach_get("bitangent", t_ln)