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Fix #105217: FBX Force Connect Children transforms Objects parented to Bones #105249

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Thomas Barlow merged 3 commits from Mysteryem/blender-addons:fbx_105217_force_connect_child_objects into main 2024-03-22 13:53:55 +01:00
Conversation 0 Commits 3 Files Changed 2 +18 -5
2 changed files with 18 additions and 5 deletions
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2
io_scene_fbx/__init__.py
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@ -5,7 +5,7 @@
bl_info = {
"name": "FBX format",
"author": "Campbell Barton, Bastien Montagne, Jens Restemeier, @Mysteryem",
"version": (5, 12, 0),
"version": (5, 12, 1),
"blender": (4, 1, 0),
"location": "File > Import-Export",
"description": "FBX IO meshes, UVs, vertex colors, materials, textures, cameras, lamps and actions",

21
io_scene_fbx/import_fbx.py
View File

@ -2658,11 +2658,8 @@ class FbxImportHelperNode:
bone.matrix = bone_matrix
# Correction for children attached to a bone. FBX expects to attach to the head of a bone,
# while Blender attaches to the tail.
self.bone_child_matrix = Matrix.Translation(-bone_tail)
force_connect_children = settings.force_connect_children
connect_ctx = [force_connect_children, ...]
for child in self.children:
if child.is_leaf and force_connect_children:
@ -2676,6 +2673,22 @@ class FbxImportHelperNode:
child_connect(bone, child_bone, None, connect_ctx)
child_connect_finalize(bone, connect_ctx)
# Correction for children attached to a bone. FBX expects to attach to the head of a bone, while Blender
# attaches to the tail.
if force_connect_children:
# When forcefully connecting, the bone's tail position may be changed, which can change both the bone's
# rotation and its length.
# Set the correction matrix such that it transforms the current tail transformation back to the original
# head transformation.
head_to_origin = bone.matrix.inverted_safe()
tail_to_head = Matrix.Translation(bone.head-bone.tail)
origin_to_original_head = bone_matrix
tail_to_original_head = head_to_origin @ tail_to_head @ origin_to_original_head
self.bone_child_matrix = tail_to_original_head
else:
self.bone_child_matrix = Matrix.Translation(-bone_tail)
return bone
def build_node_obj(self, fbx_tmpl, settings):