More advantages of ray-tracing

Ray tracing algorithms have some advantages and disadvantages. Because ray tracing follow the path of THIS ray, it is some kind of independent to other rays. this features is controversial. The biggest drawback of this is that it is very expensive (costs too much time), and its benefit is that it makes ray tracing algorithms very easy to be parallelized. This is very important for modern computers framework since nowadays main stream CPUs have over 4 cores.

I hope I could see PC game using ray tracing algorithms in near furture.