The base type for all filters which operate using one or more input filters.
Container for user-defined plugs. Nodes should never make their own plugs here, so users are free to do as they wish.
The on/off state of the filter. When it is off, the result of the first input is passed through unchanged.
The result of the filter. This should be connected into the “filter” plug of a FilteredSceneProcessor.
The input filter