Glass Cutting – How to?

I have countless panels of slding glass door panels. You know 3.5′ X 5.5′ glass without the aluminum framing on it. Anyway, I’d like to make some art with them. I was thinking about making a prism pyramid. Can you tell me what I’d need to cut this 1/4′ thick glass for the laymen? I was thinking a roto-tool with a glass cutting blade? If so, will the blade wear down quick? They are quite pricey. Your advice on the best way to approach this? Thanks