I planned to implement photon mapping for the final project. It turned out that I have not enough time to do that.
Instead of adding any function to my raytracer, I decided to write a good parser, because that is the most urgent thing my raytracer needs.
So, I just put some simple images below, which simulate the effect of photon mapping quite well for thin glasses.
And, I will put some result of my parser here if I can get some significant result this morning.