user: Describe Bpy.Types.Usdhook from the Blender manual or Python API, including usage steps and snippets.

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Note You are not using the most up to date version of the documentation. is the newest version. Back to top Toggle Light / Dark / Auto color theme Toggle table of contents sidebar USDHook(bpy_struct) ¶ USD Hook Example ¶ This example shows an implementation of USDHook to extend USD export and import functionality. Callback Function API ¶ One may optionally define any or all of the following callback functions in the USDHook subclass. on_export ¶ Called before the USD export finalizes, allowing modifications to the USD stage immediately before it is saved. Args: export_context ( USDSceneExportContext ): Provides access to the stage and dependency graph Returns: True on success or False if the operation was bypassed or otherwise failed to complete on_material_export ¶ Called for each material that is exported, allowing modifications to the USD material, such as shader generation. Args: export_context ( USDMaterialExportContext ): Provides access to the stage and a texture export utility function bl_material ( bpy.types.Material ): The source Blender material usd_material ( pxr.UsdShade.Material ): The target USD material to be exported Returns: True on success or False if the operation was bypassed or otherwise failed to complete Note that the target USD material might already have connected shaders created by the USD exporter or by other material export hooks. on_import ¶ Called after the USD import finalizes. Args: import_context ( USDSceneImportContext ): Provides access to the stage and a map associating USD prim paths and Blender IDs Returns: True on success or False if the operation was bypassed or otherwise failed to complete material_import_poll ¶ Called to determine if the USDHook implementation can convert a given USD material. Args: import_context ( USDMaterialImportContext ): Provides access to the stage and a texture import utility function usd_material ( pxr.UsdShade.Material ): The source USD material to be exported Returns: True if the hook can convert the material or False otherwise If any hook returns True from material_import_poll , the USD importer will skip standard USD Preview Surface or MaterialX import and invoke the hook’s on_material_import method to convert the material instead. on_material_import ¶ Called for each material that is imported, to allow converting the USD material to nodes on the Blender material. To ensure that this function gets called, the hook must also implement the material_import_poll() callback to return True for the given USD material. Args: import_context ( USDMaterialImportContext ): Provides access to the stage and a texture import utility function bl_material ( bpy.types.Material ): The target Blender material with an empty node tree usd_material ( pxr.UsdShade.Material ): The source USD material to be imported Returns: True on success or False if the conversion failed or otherwise did not complete Context Classes ¶ Instances of the following built-in classes are provided as arguments to the callbacks. USDSceneExportContext ¶ Argument for on_export . Methods: get_stage() : returns the USD stage to be saved get_depsgraph() : returns the Blender scene dependency graph USDMaterialExportContext ¶ Argument for on_material_export . Methods: get_stage() : returns the USD stage to be saved export_texture(image: bpy.types.Image) : Returns the USD asset path for the given texture image The export_texture function will save in-memory images and may copy texture assets, depending on the current USD export options. For example, by default calling export_texture(/foo/bar.png) will copy the file to a textures directory next to the exported USD and will return the relative path ./textures/bar.png . USDSceneImportContext ¶ Argument for on_import . Methods: get_prim_map() returns a dict where the key is an imported USD Prim path and the value a list of the IDs created by the imported prim. get_stage() returns the USD stage which was imported. USDMaterialImportContext ¶ Argument for material_import_poll and on_material_import . Methods: get_stage() : returns the USD stage to be saved. import_texture(asset_path: str) : for the given USD texture asset path, returns a tuple[str, bool] , containing the asset’s local path and a bool indicating whether the path references a temporary file. The import_texture function may copy the texture to the local file system if the given asset path is a package-relative path for a USDZ archive, depending on the current USD Import Textures options. When the Import Textures mode is Packed , the texture is saved to a temporary location and the second element of the returned tuple is True , indicating that the file i