Realistic Camera - Lens Flares and Bokehs
My idea is to extend the realistic camera model in order to simulate some of the lens-internals related phenomenas in real cameras: lens flares, and bokeh (http://en.wikipedia.org/wiki/Bokeh). To do that, I would add to our lens model, support for reflection and scattering, as well as the wavelength-dependency of these laws. Other minor extensions to the realistic camera model would include implementing the size of the aperture (often hexagonal) which causes artifacts of the same shape on the picture. The goal would be to obtain "physically-realistic" pictures of lens flares and bokehs, which would contrast against the "empirical" lens flares that have been used in videogames for a long time.
References
http://en.wikipedia.org/wiki/Lens_flare http://en.wikipedia.org/wiki/Bokeh