135 lines
6.7 KiB
Python
135 lines
6.7 KiB
Python
"""FBX skeletal meshes and animation clips, including exports from Blender."""
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from dataclasses import dataclass
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from pathlib import Path
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import unreal
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from .paths import GENERATED, PROJECT, slug
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from .characters import _clips
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@dataclass
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class SkeletalImport:
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mesh: unreal.SkeletalMesh
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animations: dict[str, unreal.AnimSequence]
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def _source(filename):
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source = Path(filename).expanduser()
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source = (source if source.is_absolute() else PROJECT / source).resolve()
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if not source.is_file() or source.suffix.lower() != ".fbx":
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raise ValueError(f"Wymagany istniejacy FBX ze szkieletem: {source}")
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return source
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def _cached(destination, name, skeleton=None):
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asset = unreal.load_asset(destination + "/" + name)
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expected = unreal.SkeletalMesh if skeleton is None else unreal.AnimSequence
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if not isinstance(asset, expected):
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return None
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objects = [asset]
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if skeleton is None:
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for path in unreal.EditorAssetLibrary.list_assets(destination, recursive=False, include_folder=False):
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clip = unreal.load_asset(path)
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if isinstance(clip, unreal.AnimSequence):
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objects.append(clip)
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elif asset.get_editor_property("skeleton") != skeleton:
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return None
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return objects
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def _import(source, destination, name, skeleton=None, reimport=False):
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if not reimport:
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objects = _cached(destination, name, skeleton)
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if objects is not None:
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return objects
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options = unreal.FbxImportUI()
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options.set_editor_property("automated_import_should_detect_type", False)
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options.set_editor_property("import_as_skeletal", True)
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options.set_editor_property("import_mesh", skeleton is None)
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options.set_editor_property("import_animations", True)
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options.set_editor_property("create_physics_asset", False)
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options.set_editor_property("import_materials", skeleton is None)
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options.set_editor_property("import_textures", skeleton is None)
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options.set_editor_property("override_animation_name", name + "_Anim" if skeleton is None else name)
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options.set_editor_property("mesh_type_to_import", unreal.FBXImportType.FBXIT_SKELETAL_MESH
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if skeleton is None else unreal.FBXImportType.FBXIT_ANIMATION)
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if skeleton is not None:
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options.set_editor_property("skeleton", skeleton)
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options.anim_sequence_import_data.set_editor_property(
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"animation_length", unreal.FBXAnimationLengthImportType.FBXALIT_EXPORTED_TIME)
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options.anim_sequence_import_data.set_editor_property("snap_to_closest_frame_boundary", True)
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task = unreal.AssetImportTask()
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for key, value in {"filename": str(source), "destination_path": destination,
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"destination_name": name, "automated": True, "replace_existing": True,
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"replace_existing_settings": True, "save": True, "async_": False,
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"options": options, "factory": unreal.FbxFactory()}.items():
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task.set_editor_property(key, value)
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# UE 5.7 otherwise routes FBX reimports through Interchange, which does not
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# consistently honor FbxImportUI (notably the target animation skeleton).
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flag = "Interchange.FeatureFlags.Import.FBX"
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previous = unreal.SystemLibrary.get_console_variable_int_value(flag)
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unreal.SystemLibrary.execute_console_command(None, flag + " 0")
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try:
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unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks([task])
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objects = list(task.get_objects())
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# Saving the mesh alone can leave its new skeleton/materials unsaved.
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unreal.EditorAssetLibrary.save_directory(destination, only_if_is_dirty=True, recursive=True)
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# Legacy FBX reports the primary mesh only; embedded animation assets
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# are registered alongside it rather than included in task.get_objects().
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paths = {obj.get_path_name() for obj in objects}
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embedded = (unreal.EditorAssetLibrary.list_assets(destination, recursive=False, include_folder=False)
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if skeleton is None else [])
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for path in embedded:
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obj = unreal.load_asset(path)
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if isinstance(obj, unreal.AnimSequence) and obj.get_path_name() not in paths:
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objects.append(obj)
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return objects
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finally:
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unreal.SystemLibrary.execute_console_command(None, f"{flag} {previous}")
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def import_animation(filename, skeleton, name="Clip", destination=None, reimport=False):
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"""Import a clip for this exact skeleton; no automatic retargeting."""
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source = _source(filename)
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name = slug(name)
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objects = _import(source, destination or f"{GENERATED}/Skeletal/{name}/Animations", name, skeleton,
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reimport=reimport)
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clips = [obj for obj in objects if isinstance(obj, unreal.AnimSequence)]
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if len(clips) != 1:
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raise RuntimeError(f"{source.name}: oczekiwano jednej animacji, otrzymano {len(clips)}.")
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if clips[0].get_editor_property("skeleton") != skeleton:
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raise ValueError("Animacja ma inny szkielet. Uzyj animacji dla tej samej postaci z Mixamo.")
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return clips[0]
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def import_model(filename, name="Character", animations=None, collection="Character", reimport=False):
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"""Import an FBX/.blend and discover animation FBXs beside the source model.
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animations=None loads all neighboring clips using names derived from filenames.
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Pass a dictionary to select files explicitly; {} skips neighboring clips.
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"""
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source = Path(filename).expanduser()
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source = (source if source.is_absolute() else PROJECT / source).resolve()
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if animations is None:
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animations = _clips(source)
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name = slug(name)
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destination = f"{GENERATED}/Skeletal/{name}"
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objects = None if reimport else _cached(destination, name)
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if objects is None:
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if source.suffix.lower() == ".blend":
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from .blender import export
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source = export(source, name=name, collection=collection, skeletal=True)
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source = _source(source)
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objects = _import(source, destination, name, reimport=True)
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meshes = [obj for obj in objects if isinstance(obj, unreal.SkeletalMesh)]
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if len(meshes) != 1:
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raise RuntimeError(f"{source.name}: oczekiwano jednego SkeletalMesh, otrzymano {len(meshes)}. "
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"Eksportuj jedna postac ze szkieletem i wagami (Mixamo: With Skin).")
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clips = {obj.get_name(): obj for obj in objects if isinstance(obj, unreal.AnimSequence)}
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skeleton = meshes[0].get_editor_property("skeleton")
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for alias, filename in (animations or {}).items():
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clips[alias] = import_animation(filename, skeleton, name=slug(alias),
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destination=destination + "/Animations", reimport=reimport)
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return SkeletalImport(meshes[0], clips)
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