glTF exporter: Fix T71313 Bad normal export this normal modifiers

1 files changed, 4 insertions, 3 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py
index 6ab77945..43a6e5d1 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py
@@ -248,11 +248,12 @@ def __gather_mesh(blender_object, export_settings):
     if export_settings[gltf2_blender_export_keys.APPLY]:
         auto_smooth = blender_object.data.use_auto_smooth
         edge_split = None
-        if auto_smooth:
+        some_normals_modifier = any([m in modifier_normal_types for m in [mod.type for mod in blender_object.modifiers]])
+        if auto_smooth and not some_normals_modifier:
             edge_split = blender_object.modifiers.new('Temporary_Auto_Smooth', 'EDGE_SPLIT')
             edge_split.split_angle = blender_object.data.auto_smooth_angle
             edge_split.use_edge_angle = not blender_object.data.has_custom_normals
-            blender_object.data.use_auto_smooth = any([m in modifier_normal_types for m in [mod.type for mod in blender_object.modifiers]])
+            blender_object.data.use_auto_smooth = some_normals_modifier
             bpy.context.view_layer.update()
 
         armature_modifiers = {}
@@ -275,7 +276,7 @@ def __gather_mesh(blender_object, export_settings):
             for idx, show_viewport in armature_modifiers.items():
                 blender_object.modifiers[idx].show_viewport = show_viewport
 
-        if auto_smooth:
+        if auto_smooth and not some_normals_modifier:
             blender_object.data.use_auto_smooth = True
             blender_object.modifiers.remove(edge_split)
     else: