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Fix #104665: FBX Export: Duplicate materials cause material indices to be offset #104667

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Bastien Montagne merged 1 commits from Mysteryem/blender-addons:fix_duplicate_material_export_pr into blender-v3.6-release 2023-06-06 17:36:14 +02:00
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1 changed files with 4 additions and 1 deletions
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5
io_scene_fbx/export_fbx_bin.py
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@ -2899,20 +2899,23 @@ def fbx_data_from_scene(scene, depsgraph, settings):
_objs_indices = {}
for ma, (ma_key, ob_objs) in data_materials.items():
for ob_obj in ob_objs:
connections.append((b"OO", get_fbx_uuid_from_key(ma_key), ob_obj.fbx_uuid, None))
# Get index of this material for this object (or dupliobject).
# Material indices for mesh faces are determined by their order in 'ma to ob' connections.
# Only materials for meshes currently...
# Note in case of dupliobjects a same me/ma idx will be generated several times...
# Should not be an issue in practice, and it's needed in case we export duplis but not the original!
if ob_obj.type not in BLENDER_OBJECT_TYPES_MESHLIKE:
connections.append((b"OO", get_fbx_uuid_from_key(ma_key), ob_obj.fbx_uuid, None))
continue
_mesh_key, me, _free = data_meshes[ob_obj]
material_indices = mesh_material_indices.setdefault(me, {})
if ma in material_indices:
# Material has already been found for this mesh.
# XXX If a mesh has multiple material slots with the same material, they are combined into one slot.
# Even if duplicate materials were exported without combining them into one slot, keeping duplicate
# materials separated does not appear to be common behaviour of external software when importing FBX.
continue
connections.append((b"OO", get_fbx_uuid_from_key(ma_key), ob_obj.fbx_uuid, None))
idx = _objs_indices[ob_obj] = _objs_indices.get(ob_obj, -1) + 1
material_indices[ma] = idx
del _objs_indices