clip.py 文件源码

def preprocessNode(nodeName):
    '''
    Preprocessing a node.
    This is needed as some nodes (like ramp or bump) can be
    replaced by several other nodes for Katana.
    We return either one original node or several
    nodes if something was replaced during preprocessing
    '''
    nodeType = cmds.nodeType(nodeName)
    if nodeType not in premap:
        return None
    nodes = {}
    attributes = getNodeAttributes(nodeName)
    connections = {}
    nodeConnections = cmds.listConnections(nodeName, source=True, destination=False, connections=True, plugs=True)
    if nodeConnections:
        for i in range(len(nodeConnections) / 2):
            connTo = nodeConnections[i * 2]
            connTo = connTo[connTo.find('.') + 1:]
            connFrom = nodeConnections[i * 2 + 1]
            connections[connTo] = {
                'node': connFrom[:connFrom.find('.')],
                'originalPort': connFrom[connFrom.find('.') + 1:]
            }

    node = {
        'name': nodeName,
        'type': nodeType,
        'attributes': attributes,
        'connections': connections,
        'renamings': {}
    }
    premapSettings = premap[nodeType]
    for attr in ['type', 'postprocess']:
        if premapSettings.get(attr):
            node[attr] = premapSettings.get(attr)
    if premapSettings.get('preprocess'):
        preprocessFunc = premapSettings.get('preprocess')
        if preprocessFunc:
            preprocessResult = preprocessFunc(node)
            if preprocessResult:
                nodes.update(preprocessResult)
    else:
        nodes[node['name']] = node
    return nodes