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I solved your problem in Unity2017 by change the if statement to "Physics.Raycast (camRay, out floorHit, camRayLength)" i.e. in the new Unity...
I solve this problem by set up the vignette value to 0 in camera's inspector. Actually I believe you should always set the value between 0 and 1...
However, in my testing, the lighting effect has some problem. What I see is over-white images, and I can't let it go with turning light intensity...