Realised you should use the Cframe matrix, here: http://wiki.roblox.com/index.php?title=Heading,_attitude,_and_bank
COMMUNITY QUESTION
Lock the camera 's horizontal axis to a brick's horizontal axis? [SOLVED]
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What you want is not clear. Do you want the y-value of the Camera to be fixed, but allow them to rotate about the y-axis? Or do you want the camera to be fixed in the yz-plane so that they can only control its x value?