directional edge detection

Extremely new to nuke. This weekend I went through a bunch of tutorials. I’m getting the hang of it. I’m trying to fake a directional edge light on footage that was shot on green screen.

I would like to use my key/alpha to pull a directional edge detection. I normally would use sapphire edge detect in flame. It has a directional parameter built in. Is there a way to do this in Nuke without 3rd party plugins? I’m aware I can mask it but looking for a quick solution.

Much appreciated!

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