relighting a 2d image

i have some green screen footage with no directional lighting beign comped into a scene with obviose directional lighting. I want to be able to somehow do a basic relight on my greenscreen actor.

in flame I would add a slight displacement on the 2D image in z space and light that.

for some reason i cant get the displaceGeo node to work correctly on my card.

also if you creat a ligth in a scene and then don’t want it anymore how do u get the nuke default light to work again?

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