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Example using Alembic python api to get the full inclusive matrix for objects in the .abc file.
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| import alembic.Abc | |
| from alembic.AbcGeom import IXform | |
| kWrapExisting = alembic.Abc.WrapExistingFlag.kWrapExisting | |
| def get_matrix(obj): | |
| if not IXform.matches(obj.getHeader()): | |
| raise TypeError("Object is not an xform: {0}".format(obj)) | |
| x = IXform(obj, kWrapExisting) | |
| xs = x.getSchema().getValue() | |
| return xs.getMatrix() | |
| def get_inclusive_matrix(obj): | |
| """Return inclusive matrix of Alembic Object""" | |
| matrix = get_matrix(obj) | |
| parent = obj.getParent() | |
| while parent: | |
| try: | |
| parent_matrix = get_matrix(parent) | |
| except TypeError: | |
| # Parent is not an xform | |
| break | |
| matrix *= parent_matrix | |
| parent = parent.getParent() | |
| return matrix | |
| def get_alembic_transforms(filename): | |
| """Return transform matrices from the Alembic hierarchy | |
| Arguments: | |
| filename (str): Full path to Alembic archive to read. | |
| Returns: | |
| dict: Mapping of node full path with its world-space matrix. | |
| """ | |
| # Normalize alembic path | |
| path = os.path.normpath(filename) | |
| path = path.replace("\\", "/") | |
| path = str(path) # path must be string | |
| archive = alembic.Abc.IArchive(path) | |
| root = archive.getTop() | |
| node_matrices = {} | |
| iterator = list(root.children) | |
| for obj in iterator: | |
| # Include children children | |
| iterator.extend(obj.children) | |
| node_path = obj.getFullName() | |
| # Check if is transform | |
| if not IXform.matches(obj.getHeader()): | |
| continue | |
| matrix = get_inclusive_matrix(obj) | |
| node_matrices[node_path] = matrix | |
| return node_matrices | |
| path_matrices = get_alembic_transforms(path) | |
| for node_path, matrix in path_matrices.items(): | |
| print(node_path) | |
| print("\t{0}".format(matrix)) | |
| # Example output: | |
| # /character_GRP/eye_L_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/mouth_GRP/back_mouth_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/tongue_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/stand_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/eye_R_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/body_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/mouth_GRP | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) | |
| # /character_GRP/mouth_GRP/teeth_GES | |
| # M44d((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1)) |
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