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THIS ONLY WORKS FOR VISIONLAB!!!
first, have your rotoscoped lightsaber keyframes ready for rendering
then, make your core and glow both white
turn off all other layers so that all you see is the white lightsaber
match the render in and out points with the in and out points of the lightsaber effect
render your effect
bring it back into visionlab
set it back in the timeline, matching the in and out points with the effect you just rendered
add an "invert" grade to your new layer
then click away and the lightsaber will now be black. you can turn your other layers back on and continue with your project.