Phil, I think you need Tiger's putting simulator

Evidently, it must control the 'floor' of the putting surface because you can change the camber of the putting line and a laser will draw the new line (kind of like those beds that with a push of a button, you can make the feet or head area rise or fall).

http://www.golfwrx.com/622516/tigers-indoor-putting-simulator-is-as-impressive-as-youd-imagine/?utm_source=Front&utm_medium=Featured_Latest&utm_campaign=GolfWRX_OnSite&utm_content=unused