parameters {
    opacity [type=float][default=1.0][values=<float>];
    shader [type=string][default=dummy][values=<string>];
    buffer1 [type=string][default=dummy][values=<string>];
    buffer2 [type=string][default=dummy][values=<string>];
}

methods {
    setBuffers(<event>,<string>,<string>);
}
