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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
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1 changed files with 17 additions and 4 deletions
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21
io_scene_fbx/import_fbx.py
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@ -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):