lib.py 文件源码

def export_alembic(nodes,
                   file,
                   frame_range=None,
                   write_uv=True,
                   write_visibility=True,
                   attribute_prefix=None):
    """Wrap native MEL command with limited set of arguments

    Arguments:
        nodes (list): Long names of nodes to cache
        file (str): Absolute path to output destination
        frame_range (tuple, optional): Start- and end-frame of cache,
            default to current animation range.
        uv_write (bool, optional): Whether or not to include UVs,
            default to True
        attribute_prefix (str, optional): Include all user-defined
            attributes with this prefix.

    """

    if frame_range is None:
        frame_range = (
            cmds.playbackOptions(query=True, ast=True),
            cmds.playbackOptions(query=True, aet=True)
        )

    options = [
        ("file", file),
        ("frameRange", "%s %s" % frame_range),
    ] + [("root", mesh) for mesh in nodes]

    if isinstance(attribute_prefix, basestring):
        # Include all attributes prefixed with "mb"
        # TODO(marcus): This would be a good candidate for
        #   external registration, so that the developer
        #   doesn't have to edit this function to modify
        #   the behavior of Alembic export.
        options.append(("attrPrefix", str(attribute_prefix)))

    if write_uv:
        options.append(("uvWrite", ""))

    if write_visibility:
        options.append(("writeVisibility", ""))

    # Generate MEL command
    mel_args = list()
    for key, value in options:
        mel_args.append("-{0} {1}".format(key, value))

    mel_args_string = " ".join(mel_args)
    mel_cmd = "AbcExport -j \"{0}\"".format(mel_args_string)

    # For debuggability, put the string passed to MEL in the Script editor.
    print("mel.eval('%s')" % mel_cmd)

    return mel.eval(mel_cmd)