Topics created by d_keith

Hello @d_keith,

Thank you for reaching out to us. So, I had a look, and I could not find a bug with ExpandAssetCategoryId. I tried built-in categories, custom categories, and custom categories inside a custom database. My traversal method does return everything what I would expect to be returned. Find a more elaborate variant of ExpandAssetCategoryId below (I turned it into a class for easier inspection of the data).

There are a few things which could go wrong here:

You misunderstood the purpose of ExpandAssetCategoryId, it expands a category tree in a top-down fashion. E.g., for A->B->C, ExpandAssetCategoryId(B) will yield B, C but not A. It could certainly be done differently but that would be up to you. There is a bug in your code in another place. There might exist special conditions in the environment you are working in, but that is nothing for the forum.

Find below my example which will expand asset category trees from a root in a more visual and therefore easier to check manner.

Cheers,
Ferdinand

The result:

-------------------------------------------------------------------------------- AssetCategoryHandler at 0X7FD2F3350B90 (repo = database@U1pOb6rnHdar41NpWahfnn): Managed IDs: (maxon.Id('category@3d2621c1bc48485aa2b7ceead989e421'), maxon.Id('category_32a5e2eefcc10592'), maxon.Id('category_3e39b2c258ae9313'), maxon.Id('category_f7cb610b3f172a93'), maxon.Id('category_8f51f303e1bbf875'), maxon.Id('category_bb4c48de0af7b8b3'), maxon.Id('category_28801c2ab359e01e'), maxon.Id('category_fd68f940d0b615ab'), maxon.Id('category_993d6d73f3c2629e'), maxon.Id('category_fce5f1171ae19de7'), maxon.Id('category_50bbe4f91e99090b'), maxon.Id('category_074c78c3e2d70ab9'), maxon.Id('category_c92b8c257f9e7517'), maxon.Id('category@23efef776140438f80b9ca1b0eef53f7'), maxon.Id('category_a800e5a243f9f385'), maxon.Id('category_9676f914364e4e27'), maxon.Id('category_e024f65cd280795e'), maxon.Id('category_2ab08ca489795a07'), maxon.Id('category_c04b37955dcb3895'), maxon.Id('category_34ed541e2020f38e'), maxon.Id('category_f7316fed1fc11137'), maxon.Id('category_efb8eae1116900c2'), maxon.Id('category_c0e06630879697c2'), maxon.Id('category_f4afa4f900193b95'), maxon.Id('category_476ff23d55425ca4'), maxon.Id('category_58e6a054402a25fd'), maxon.Id('category_ddcdf72383424d7e'), maxon.Id('category_ca1600eb107c6082'), maxon.Id('category_1b0948c77cb2f61e'), maxon.Id('category@c19d76abc1bf46f296ed837fd9e8a215'), maxon.Id('category_f40806b20b84f759'), maxon.Id('category_8ea059e3d503175a'), maxon.Id('category_9147f39c273d8342'), maxon.Id('category@6608dc0e700442f196c788a53170a078'), maxon.Id('category@d8567d0c206145979ef94bf495128c00'), maxon.Id('category@1bc8d3a8b3764acfb82bf5409646fe9f'), maxon.Id('category@8b5f3e8dfbb2489caff67db176800a50'), maxon.Id('category@d1b7bff693344889aa2b98b2f77e80ac'), maxon.Id('category@edad962d94254a26a90a492fae589221'), maxon.Id('category@7cd25e2b9d5c408986cded4f33d59c47'), maxon.Id('category@ed2c2d5352cc461389526a4d9006febc'), maxon.Id('category@5daaf21dde924b7abf18a25256282b69'), maxon.Id('category@338d4b421ddb4ac1a1d7df21c0376911'), maxon.Id('category@c0455a450d0e40eba0c09ad0673d876a'), maxon.Id('category@88057ec2780148708363b96272234ded'), maxon.Id('category@9d1a886ec1584d9f8794c59187c3d3d1'), maxon.Id('category@cec99ab7a44f4b0bac4cedd538f44e02'), maxon.Id('category@13549430f6a54bee9562d3541cb85614'), maxon.Id('category@323d8d63b88b4ab4ba5bed368d895048'), maxon.Id('category@a28830367831413f9fa5b66e4a5dd65f'), maxon.Id('category@94fc8cb5718a492d9fd34f907b89720d'), maxon.Id('category@bae2bf9f00d949c7b5df05cd6cba7966'), maxon.Id('category_bb2ed911f3303be2'), maxon.Id('category_4c6f230c27d35ad7'), maxon.Id('category_e2204ff5b9252604'), maxon.Id('category_0359297d725f327a'), maxon.Id('category_4cc30dbe0f38a155'), maxon.Id('category_1fee6083977acfee'), maxon.Id('category_5904e55a542a55eb'), maxon.Id('category@3448f9feaed44cedac87d499a4567a26'), maxon.Id('category_248c7a50c5c70f4c'), maxon.Id('category_8509ac933bece593'), maxon.Id('category@3be598900c7a428eb0fcbced997655ba'), maxon.Id('category_64f67f3727141f1a'), maxon.Id('category@e33ef358a9b24d6cab80454a4179e419'), maxon.Id('category_63ebef6aab44bd4d'), maxon.Id('category_045526cd4a11b6dc'), maxon.Id('category@a91d4cacaeba4170bf0c202d583fe2e0'), maxon.Id('category@35ee4e3871414784a3767fc2037c305b'), maxon.Id('category_04cdfd3b558329b6'), maxon.Id('category_24b5ae0d89e20ccc'), maxon.Id('category_cd5ad0a08c825d60'), maxon.Id('category_1c643f453b71129e'), maxon.Id('category_f9bd2fcc800c8279'), maxon.Id('category_468266206e683e39'), maxon.Id('category_172e168c2640e535'), maxon.Id('category@c9f25306ba024d939ae97d0999d70995'), maxon.Id('category_ab975c5373b7ba07'), maxon.Id('category@5e2b516fbc0541ad9d59781d675ad8f9'), maxon.Id('category_0133f046d03a46e7'), maxon.Id('category_74ec3ae6ecaab0de'), maxon.Id('category_fcf83cd1ff7e0fea'), maxon.Id('category_32750a41ff5ae804'), maxon.Id('category_f3dfa1fc22e1760f'), maxon.Id('category_8c28445d28cba3b6'), maxon.Id('category_65263c7c1c8c423c'), maxon.Id('category_67a056c194d9897c'), maxon.Id('category_73d82da307ebac4f'), maxon.Id('category_fa850c478d745f9e'), maxon.Id('category@780d427523e243028086a1aa33745b66'), maxon.Id('category_8cbecf2e6c1c53e6'), maxon.Id('category_66c6a982b7227e77'), maxon.Id('category_a2fde34845c656bd'), maxon.Id('category_95b2c4bc77dbeb2d'), maxon.Id('category@f7ac3097518e4141a80ec19bc0c8548b'), maxon.Id('category@93c3e0df81e54acfae70a129ad8f7fc0'), maxon.Id('category@9812f958facf4bc39d90fb79cc4fe783'), maxon.Id('category_ecfd5ef0b32fdc6e'), maxon.Id('category@4d87bd4452b8493aa2ffd9e9500cba56'), maxon.Id('category_de343673ae7ff879'), maxon.Id('category_2aa95f92d383989e'), maxon.Id('category_aded6c15b065a4a5'), maxon.Id('category_fe8c8340d4cfebef'), maxon.Id('category_2d90a72a03048a0a'), maxon.Id('category_8191022b0575a8c8'), maxon.Id('category_94bc6daab0db3454'), maxon.Id('category@7f080054d14f4758aefb36dfae705b88'), maxon.Id('category@d7bd914db4194b13baebbb49f981f395'), maxon.Id('category_bdac9c772d258396'), maxon.Id('category@ee5c708a346740a591544bb9be87cf8d'), maxon.Id('category_f72dcc94be532fa4'), maxon.Id('category_d6e2d304d1c0eb76'), maxon.Id('category_819c3f327c46106c'), maxon.Id('category_a7dd93c148997ea2'), maxon.Id('category_adbf1096d2400c47'), maxon.Id('category_6bf21b118e626b8f'), maxon.Id('category_66478df5e0c296b2'), maxon.Id('category_5ff49c9a181cad8c'), maxon.Id('category_06eaa38e9750e5e3'), maxon.Id('category_732f5bf076c873c7'), maxon.Id('category_781d1c68184a4319'), maxon.Id('category_b6d6fd4c864f01d8'), maxon.Id('category_bcc53614ed7486b6'), maxon.Id('category_20a0233895be23f3'), maxon.Id('category_d42b5d6450873989'), maxon.Id('category_cea3e864eb47b596'), maxon.Id('category_3385066daeaf9819'), maxon.Id('category@1445293c87e64c7684011d9c0477754e'), maxon.Id('category@1f03b25c815e421789036e5a84a3ccf1'), maxon.Id('category@9a2779a603bc4e1f93b9577abe5ecad1'), maxon.Id('category@3064bcb4ff4e4ae890730837caea6f10'), maxon.Id('category@1ba9498066ff42b6b2916242f8d8e7bb'), maxon.Id('category@ef89ec1e9b5a47a5b245e05c5c8b1418'), maxon.Id('category@b674f3ffaa9247f390fdbd49a08111a7'), maxon.Id('category@9a75f45dc5984049b0307b5dc1aea91e'), maxon.Id('category_ef962b4216a17f64'), maxon.Id('category_5a9141a0036aa0e2'), maxon.Id('category_e682fa27d7eb619d'), maxon.Id('category_899783790d811f25'), maxon.Id('category@beb1c0ee13d948faa8e2b084e6b23ab6')) Tree: '/Objects' '/Objects/Info Graphics' '/Objects/Humans' '/Objects/Humans/3D Posable Silhouettes' '/Objects/Humans/3D People - For Animation' '/Objects/Humans/3D People [Low Resolution]' '/Objects/Humans/3D People [Medium Resolution]' '/Objects/Humans/Cutout' '/Objects/Packaging' '/Objects/Tools' '/Objects/Vehicles' '/Objects/Periodicals' '/Objects/Appliances' '/Objects/Eyewear' '/Objects/Garments' '/Objects/Finance' '/Objects/Plants' '/Objects/Plants/European Trees Young' '/Objects/Plants/Garden & Exotic' '/Objects/Plants/European Trees Mature' '/Objects/Plants/Houseplants' '/Objects/Plants/Cutouts' '/Objects/Plants/Grass Elements' '/Objects/Plants/Grass Elements/Low Resolution' '/Objects/Plants/Grass Elements/Medium Resolution' '/Objects/Pots' '/Objects/Shelving' '/Objects/Shelving/Modular Cabinets & Doors' '/Objects/Shelving/Modular Cabinets & Doors/Misc Cabinet Examples' '/Objects/Shelving/Modular Cabinets & Doors/Cabinet & Door Pieces' '/Objects/Shelving/Modular Cabinets & Doors/Misc Door Examples' '/Objects/Shelving/Living Room & Bedroom' '/Objects/Celebration' '/Objects/Kitbash' '/Objects/Kitbash/Piping' '/Objects/Kitbash/Piping/Corners' '/Objects/Kitbash/Piping/Pipes' '/Objects/Kitbash/Piping/Pipe' '/Objects/Kitbash/Details' '/Objects/Kitbash/Details/Squares' '/Objects/Kitbash/Details/Crosses' '/Objects/Kitbash/Details/Geometric' '/Objects/Kitbash/Details/Triangles' '/Objects/Kitbash/Details/Hexagons' '/Objects/Kitbash/Details/Arrows' '/Objects/Kitbash/Details/Rectangles' '/Objects/Kitbash/Details/Circles' '/Objects/Kitbash/Details/Pattern' '/Objects/Kitbash/Tubes' '/Objects/Kitbash/Connectors' '/Objects/Kitbash/Joints' '/Objects/Toys' '/Objects/Outdoor Objects' '/Objects/Outdoor Objects/Scaffolds' '/Objects/Outdoor Objects/Trash Cans' '/Objects/Outdoor Objects/Buildings' '/Objects/Outdoor Objects/Buildings/Houses' '/Objects/Outdoor Objects/Buildings/Cityscape' '/Objects/Outdoor Objects/Buildings/Misc' '/Objects/Outdoor Objects/Wall Decor' '/Objects/Outdoor Objects/Manholes' '/Objects/Outdoor Objects/Miscellaneous' '/Objects/Outdoor Objects/Traffic Lights' '/Objects/Outdoor Objects/Antennas' '/Objects/Outdoor Objects/Pavement' '/Objects/Outdoor Objects/Street Lights' '/Objects/Outdoor Objects/Bus Stops' '/Objects/Outdoor Objects/Fire Escapes' '/Objects/Outdoor Objects/Infrastructure' '/Objects/Outdoor Objects/Road Signs' '/Objects/Outdoor Objects/Barriers & Barricades' '/Objects/Tables' '/Objects/Tables/Bedside Tables' '/Objects/Tables/Game Tables' '/Objects/Tables/Office Tables' '/Objects/Tables/Coffee Tables' '/Objects/Tables/Dining Tables' '/Objects/Arts & Crafts' '/Objects/Stairs' '/Objects/Cogwheel Objects' '/Objects/Cogwheel Objects/Saws' '/Objects/Cogwheel Objects/Gears' '/Objects/Cogwheel Objects/Miscellaneous' '/Objects/Cogwheel Objects/Clutches' '/Objects/Cogwheel Objects/Ratchet' '/Objects/Cogwheel Objects/Watch Gears' '/Objects/Kitchen' '/Objects/Kitchen/Cutlery' '/Objects/Kitchen/Dinnerware' '/Objects/Kitchen/Accessories' '/Objects/Kitchen/Cookware' '/Objects/Kitchen/Serveware' '/Objects/Kitchen/Glassware' '/Objects/Screws' '/Objects/Landscape' '/Objects/Landscape/Wood' '/Objects/Landscape/Stones' '/Objects/Vases' '/Objects/Window Treatments' '/Objects/Seating' '/Objects/Seating/Sofas' '/Objects/Seating/Waiting Areas' '/Objects/Seating/Benches' '/Objects/Seating/Chairs' '/Objects/Lighting & Ceiling Fans' '/Objects/Lighting & Ceiling Fans/Ceiling Lighting' '/Objects/Lighting & Ceiling Fans/Home Safety & Security' '/Objects/Lighting & Ceiling Fans/Outdoor Lighting' '/Objects/Lighting & Ceiling Fans/Wall Lighting' '/Objects/Lighting & Ceiling Fans/Ceiling Fans' '/Objects/Lighting & Ceiling Fans/Lamps' '/Objects/Lighting & Ceiling Fans/Light Bulbs' '/Objects/Lighting & Ceiling Fans/Light Stands' '/Objects/Music' '/Objects/Bedroom' '/Objects/Bath' '/Objects/Bath/Toilets' '/Objects/Bath/Bathroom Vanities' '/Objects/Bath/Sinks' '/Objects/Bath/Towels' '/Objects/Bath/Bathroom Accessories' '/Objects/Bath/Bathtubs & Showers' '/Objects/Bath/Faucets' '/Objects/Gambling' '/Objects/Stationary' '/Objects/Sculpting Base Meshes' '/Objects/Weather' '/Objects/Home Decor' '/Objects/Home Decor/Candles' '/Objects/Home Decor/Books' '/Objects/Home Decor/Picture Frames' '/Objects/Home Decor/Decorative Storage' '/Objects/Home Decor/Candleholders' '/Objects/Home Decor/Decorative Boxes' '/Objects/Home Decor/Clocks' '/Objects/Electronics & Technology' '/Objects/Miscellaneous' '/Objects/Sports Items' '/Objects/Food' '/Objects/Doors & Windows' -------------------------------------------------------------------------------- AssetCategoryHandler at 0X7FD2F3368910 (repo = net.maxon.repository.userprefs): Managed IDs: (maxon.Id('category@0ad833e88d774ac1ae4fd277e57ecacc'), maxon.Id('category@d8bc777f959e48bda659d1674bb1d5f3'), maxon.Id('category@0399404fe6fc46558b8f98f63d49ce28'), maxon.Id('category@08ab3faa66e348fe86574469cbabb2c7'), maxon.Id('category@793e20a462f04c64a5cea28209f9a38b')) Tree: '/MyUserCategory' '/MyUserCategory/Blah' '/MyUserCategory/Blah/Blub' '/MyUserCategory/Blub' '/MyUserCategory/Blub/Blah' -------------------------------------------------------------------------------- AssetCategoryHandler at 0X7FD2F1CBED10 (repo = database@CGBLAN4TBpzrDfyA9gjMTn): Managed IDs: (maxon.Id('category@d1233ed9975945debc8942a30edfd706'), maxon.Id('category@cfce060493cd4c61b92a115624d33eb1'), maxon.Id('category@fa80f5a53cea42b7a72f494f0d673377'), maxon.Id('category@ae9c2c99dee74deeb8a7a7d711d57ffe'), maxon.Id('category@ffc383ed61454affa841f13931f93125')) Tree: '/AlsoUserCategory' '/AlsoUserCategory/Foo' '/AlsoUserCategory/Foo/Bar' '/AlsoUserCategory/Blah' '/AlsoUserCategory/Blah/Blub'

The code:

"""Provides a type to expand asset categories into trees. """ import c4d import maxon import typing import pprint class AssetCategoryHandler: """Handles an asset category that is a root to zero to many descendant categories. """ def __init__(self, asset: maxon.AssetDescription, categories: list[maxon.AssetDescription] = [], language: maxon.LanguageRef = maxon.Resource.GetCurrentLanguage(), path: str = ""): """Initializes the handler. Args: asset (maxon.AssetDescription): The category asset to expand. categories (list[maxon.AssetDescription], optional): A list of categories which should be respected for expansion, when the empty list is passed, the assets will be gathered from the repository #asset is attached to. Defaults to []. language (maxon.LanguageRef, optional): The language to retrieve asset strings in. Defaults to maxon.Resource.GetCurrentLanguage(). path (str, optional): [internal] The current parent path. Defaults to "". Raises: TypeError: On type assertion failures. """ # Type checks and retrieving some data from the asset. if not isinstance(asset, maxon.AssetDescription) or asset.IsNullValue(): raise TypeError(f"{asset = }") if not isinstance(categories, list): raise TypeError(f"{categories = }") if not isinstance(language, maxon.LanguageRef) or language.IsNullValue(): raise TypeError(f"{language = }") self._asset: maxon.AssetDescription = asset self._aid: maxon.Id = maxon.Id(asset.GetId()) if isinstance(asset.GetId(), str) else asset.GetId() self._name: str = asset.GetMetaString(maxon.OBJECT.BASE.NAME, language, "") self._path: str = f"{path}/{self._name}" self._repo: maxon.AssetRepositoryRef = asset.GetRepository() self._categories: list[maxon.AssetDescription] = categories self._language: maxon.LanguageRef = language self._children: list["AssetCategoryHandler"] = [] # Populate _categories when empty. if len(self._categories) < 1: self._categories = self._repo.FindAssets( maxon.AssetTypes.Category(), maxon.Id(),maxon.Id(), maxon.ASSET_FIND_MODE.LATEST) # Expand the tree and cache the IDs. self.__expand__() self._ids: tuple[maxon.Id] = tuple(self.__yieldids__()) def __repr__(self) -> str: """Returns a string representation of the handler. """ return f"{self.__class__.__name__} at {str(hex(id(self))).upper()}" def __expand__(self): """Expands the handler into a tree of handlers, one for each of the descendant categories of the wrapped category asset. """ for asset in self._categories: if self._aid != maxon.CategoryAssetInterface.GetParentCategory(asset): continue child = AssetCategoryHandler(asset, self._categories, self._language, self._path) self._children.append(child) def __yieldids__(self) -> typing.Generator[maxon.Id, None, None]: """Provides a generator for all asset IDs associated with this handler. Use the property Ids instead, unless rebuilding this data is desired. """ yield self._aid for child in self._children: for aid in child.__yieldids__(): yield aid @property def Ids (self) -> tuple[maxon.Id]: """Returns a tuple of all asset IDs associated with this handler. """ return self._ids def PrintTree(self, indent: int = 0) -> None: """Prints an asset tree for this handler. """ print(f"{' ' * indent}'{self._path}'") for handler in self._children: handler.PrintTree(indent + 1) def main() -> None : """Runs the example. """ # Get the user preferences asset repository, in a production environment it will contain all # relevant assets as of 2023.1.0. if not maxon.AssetDataBasesInterface.WaitForDatabaseLoading(): raise RuntimeError("Could not load asset databases.") repo: maxon.AssetRepositoryInterface = maxon.AssetInterface.GetUserPrefsRepository() if not repo: raise RuntimeError("Unable to retrieve user repository.") # Used to shorten the call signatures of the FindLatestAsset() calls below. kwargs: dict = { "type": maxon.AssetTypes.Category(), "version": maxon.Id(), "findMode": maxon.ASSET_FIND_MODE.LATEST } # Get a couple of root level asset categories. categoryRoots: list[maxon.AssetDescription] = [ # The /Objects category in the Asset Browser, a built-in category. repo.FindLatestAsset(aid=maxon.Id("category@3d2621c1bc48485aa2b7ceead989e421"), **kwargs), # # /Example Scenes # repo.FindLatestAsset(aid= maxon.Id("category@4e785a69ef3749738bfd9d2b191535d5"), **kwargs), # # /Materials # repo.FindLatestAsset(aid= maxon.Id("category_a1ba084a9eeedb9b"), **kwargs), # # /Nodes # repo.FindLatestAsset(aid= maxon.Id("category@52d8f01357834200aa0dc28f0e61bbb3"), **kwargs), # # /Textures # repo.FindLatestAsset(aid= maxon.Id("category@8c76a408c56f4b5ca9f585dbe0ece9b7"), **kwargs), # Custom category trees, they will be filtered out on other machines then mine, since other # machines won't find these assets. # /MyUserCategory (stored in the database in the user prefs) repo.FindLatestAsset(aid= maxon.Id("category@0ad833e88d774ac1ae4fd277e57ecacc"), **kwargs), # /AlsoUserCategory (stored in a custom database) repo.FindLatestAsset(aid= maxon.Id("category@d1233ed9975945debc8942a30edfd706"), **kwargs), ] # Wrap each one of them into a handler. categoryHandlerList: list["AssetCategoryHandler"] = [ AssetCategoryHandler(asset) for asset in categoryRoots if isinstance(asset, maxon.AssetDescription) and not asset.IsNullValue()] # Iterate over the handlers and inspect their data. for handler in categoryHandlerList: print ("\n", "-" * 80) print (f"{handler} (repo = {handler._asset.GetRepositoryId()}):\n") print ("\nManaged IDs:\n") pprint.pprint(handler.Ids) print ("\nTree:\n") handler.PrintTree(indent=1) if __name__ == "__main__": main()

Hello @d_keith,

thank you for reaching out to us and your extensive documentation efforts. Much appreciated! What you did there is correct, but in the spirit of simplicity, I think the code could be a bit condensed. There snuck in a few unused (and unrelated) includes and being so generous with separating things into help functions can impact readability and execution times. I also added the "expand asset category into sub-categories" thing you wanted.

In short: I think this is a good occasion to use a receiver callback function, as this structures the code naturally. Find my take below.

Cheers,
Ferdinand

The result:

categoryIds = [maxon.Id('category@b9c32d04a12d449ca1c758ddb3c695b0'), maxon.Id('category@985a9913c47341e4a373ca71d8e73b18')] name = 'Cloudy - VHDRI.hdr', asset.GetId() = 'file_e02d0a81b02be4fa' name = 'Default HDR.hdr', asset.GetId() = 'file_2792c7829905f40d' name = 'Desert.exr', asset.GetId() = 'file_0b3eb8e7595c1b5d' name = 'jhdri-v1_ext_sunset_seastar_acescg.exr', asset.GetId() = 'file_dc156adf0cc146e8' name = 'HDR012.hdr', asset.GetId() = 'file_b1db2c38badb130c'

The code:

"""Retrieves all MediaImage assets that are attached to the "Textures/HDR" category or one of its child categories. This is an application of what I dubbed "Filtered Asset searches" in the C++ Docs, find the Python example here [1]. References: [1] https://github.com/PluginCafe/cinema4d_py_sdk_extended/blob/master/scripts/05_modules/assets/asset_databases_r26.py#L416 """ import typing import maxon def ExpandAssetCategoryId(repo: maxon.AssetRepositoryInterface, cid: maxon.Id) -> list[maxon.Id]: """Retrieves the IDs of all descendant asset categories of #cid. """ # Get all asset category assets in #repo. categoryAssets: maxon.AssetDescription = repo.FindAssets( maxon.AssetTypes.Category(), maxon.Id(),maxon.Id(), maxon.ASSET_FIND_MODE.LATEST) # The IDs we have currently to check for descendants and the final result list. idsToCheck: list[maxon.Id] = [cid] results: list[maxon.Id] = [] # Try to empty #idsToCheck while popping elements from it and adding new ones. while idsToCheck: # Remove the first element and add it to the results. cid: maxon.Id = idsToCheck.pop() results.append(cid) # Find all category assets which have #cid as their parent category and add their IDs as # to be resolved category IDs. We stop the search here early, i.e., we assume the category # tree to be mono-hierarchical (one category can only be attached to one category). There # is not really anything in the Asset API which would enforce this, but it is how asset # categories are currently handled. for asset in categoryAssets: if cid == maxon.CategoryAssetInterface.GetParentCategory(asset): aid: typing.Any = asset.GetId() idsToCheck.append(aid if isinstance(aid, maxon.Id) else maxon.Id(aid)) break return results def main() -> None : """Runs the example. """ # Make sure the asset databases have been loaded and get the user repository, i.e., the # repository where more or less all content can be found. if not maxon.AssetDataBasesInterface.WaitForDatabaseLoading(): raise RuntimeError("Could not load asset databases.") repo: maxon.AssetRepositoryRef = maxon.AssetInterface.GetUserPrefsRepository() if not repo: raise RuntimeError("Unable to retrieve user repository.") # The final #results list where we put all the asset descriptions of image assets which are # parented to category assets with any of the IDs in #categoryIds. results: list[tuple[str, maxon.AssetDescription]] = [] # The root category we are interested in, this is the id for the "Textures/HDR" category. rootCategoryId: maxon.Id = maxon.Id("category@b9c32d04a12d449ca1c758ddb3c695b0") # Expand #rootCategoryId into a list of all its attached child categories. categoryIds: list[maxon.Id] = ExpandAssetCategoryId(repo, rootCategoryId) # The language Cinema 4D is running in, use GetDefaultLanguage() to evaluate things in engUS. currentLanguage: maxon.LanguageRef = maxon.Resource.GetCurrentLanguage() def onSearchHit(asset: maxon.AssetDescription) -> bool: """Called for each asset by the FindAssets() call below. Assets which match the search criteria are written to #results. """ # Get the metadata of the asset and assert that its subtype is MediaImage, step over an asset # when these operations fail. metadata: maxon.AssetMetaData = asset.GetMetaData() if metadata is None: return True sid: maxon.InternedId = maxon.InternedId(metadata.Get(maxon.ASSETMETADATA.SubType, maxon.Id())) if sid != maxon.ASSETMETADATA.SubType_ENUM_MediaImage: return True # Append the name of the asset and the asset itself to the results when #asset is parented # to a category asset with an ID which is contained ins #categoryIds. if maxon.CategoryAssetInterface.GetParentCategory(asset) in categoryIds: results.append((asset.GetMetaString(maxon.OBJECT.BASE.NAME, currentLanguage, ""), asset)) return True # Search #repo for all file type assets (this includes MediaImage assets) with any id and pass # the data through onSearchHit. repo.FindAssets( assetType=maxon.AssetTypes.File(), aid=maxon.Id(), version=maxon.Id(), findMode=maxon.ASSET_FIND_MODE.LATEST, receiver=onSearchHit) # Print the expanded category IDs and the first five asset matches associated with them. print (f"{categoryIds = }") for name, asset in results[:5]: print (f"{name = }, {asset.GetId() = }") if __name__ == "__main__": main()

Hi All,

Thank you so much for your interest and taking the time to apply. We ended up with more applicants than could fit in one workshop. If you received an email from me (Maybe in your spam folder? look for d_keith ) you've likely been accepted. If not, I do intend to host similar workshops in the future. Candidates were given priority based on:

Prior programming expertise in C/C++/Python or similar languages. Interest and ability to actively participate in the lectures/homework projects. Availability to potentially create capsules for the Maxon Capsules Library in the future on a freelance basis. And for auditors, special preference was given to MAXON employees who will be documenting/developing/training Scene Nodes workflows.

I hope to host similar workshops in the future and will prioritize previous applicants at that time.
Sincerely,

Donovan Keith