Image based lighting test

マイレンダラーもようやく実写合成？に対応しました。
I have added the image based lighting technique to my renderer. The light probe image used with is taken from the well-known page, http://www.debevec.org/Probes/. You may see the sky reflecting on the surface of the sphere. As for the quality, this image used 2,000 rays for each pixel. Though, there still remains some noise especially on the shiny sphere. Also you see some aliases on the background. But I would appriciate this for now.