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reconstruct position for local light (deffered)

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Hi , I am using deffered shading and have problem with local lights. I thing problem is in reconstructing of position in PS. I'm using camPos+ cameraRay*depth. This works fine for fullscreen lights but in case of local lights (you render light geometry on screen) it simply doesn't work. Is there any fast way to reconstruct position also in this case ? Or i need to use "old" way ? (using inverse projMat). But i have only linear depth right now... Please help me :)

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