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Update: It is possible that this is solely a problem with my own computer and possibly the graphics drivers since I ran this application on another computer and it worked just fine.

Update: I have found that the problem was indeed in my graphics card's driver. I just updated the driver and reran the program and indeed received no black pixels.

Edit: It appears that the problem is indeed in the calcSpotLight function, but within the calcSpotLight function, the problem is the calcPointLight function. I still don't know what the exact problem is, but that should narrow down the possible errors.

Update: It is possible that this is solely a problem with my own computer and possibly the graphics drivers since I ran this application on another computer and it worked just fine.

Edit: It appears that the problem is indeed in the calcSpotLight function, but within the calcSpotLight function, the problem is the calcPointLight function. I still don't know what the exact problem is, but that should narrow down the possible errors.

Edit: It appears that the problem is indeed in the calcSpotLight function, but within the calcSpotLight function, the problem is the calcPointLight function. I still don't know what the exact problem is, but that should narrow down the possible errors.