Hi, I'm going to start a small side project of an old man and I'm confident in modeling and texturing everything but one aspect. His spectacles. I want to get a magnifying glass effect when looking at his eyes through his glasses, so that they enlarge drastically. This is the first time I've ever really wanted to do something like this and I'm not sure how to go about doing it.
I'll be using mental ray to render it out. I normally start my glass textures with a dialetric material. So anyhelp or ideas you could give me would be great.
P.S. it's going to be cartoony looking.