glTF exporter: prevent infinite recursion when mesh is skinned and parenting to same bone

Avoid this by do not skin if object is parented to a bone of the armature that skin the object: keep only parenting to bone

1 files changed, 9 insertions, 0 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 3b0fab2d..548c5299 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py
@@ -409,6 +409,15 @@ def __gather_skin(blender_object, export_settings):
     if not any(vertex.groups is not None and len(vertex.groups) > 0 for vertex in blender_mesh.vertices):
         return None
 
+    # Prevent infinite recursive error. A mesh can't have an Armature modifier
+    # and be bone parented to a bone of this armature
+    # In that case, ignore the armature modifier, keep only the bone parenting
+    if blender_object.parent is not None \
+    and blender_object.parent_type == 'BONE' \
+    and blender_object.parent.name == modifiers["ARMATURE"].object.name:
+
+        return None
+
     # Skins and meshes must be in the same glTF node, which is different from how blender handles armatures
     return gltf2_blender_gather_skins.gather_skin(modifiers["ARMATURE"].object, export_settings)