List of custom HDAs from Houdini asset manager.

findLoadedHDAs.py

# List of custom HDAs from Houdini asset manager.
def findLoadedHDAs():
    '''
    Returns a list of loaded HDAs in Houdini scene.
    HDAs installed by default with Houdini are skipped.
    '''
    loadedHDAs = []
    # Scan all node categories
    for category in hou.nodeTypeCategories().values():
        # Scan all node types
        for nodeType in category.nodeTypes().values():
            nodeDef = nodeType.definition()
            # If its a valid and unique HDA
            if (nodeDef is not None) and \
                (nodeDef.libraryFilePath() not in loadedHDAs):
                # If not stored at "HFS" (Houdini Installation)
                if not nodeDef.libraryFilePath().startswith(hou.getenv("HFS")):
                    loadedHDAs.append(nodeDef)

    return loadedHDAs