postFrame() Question

I have a rather stupid question. When you have a class that implements SceneProcessor is the method postFrame called automatically after the frame has been rendered or do you have to call it manually? I ask because I have a line being printed from this method yet it appears to never be printed unless I manually call the method. Thanks for the help.

have you added your sceneprocessor to the viewport?

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Yes I was. It is working now though, I am not sure what has changed. Thanks for the time.