摘要： In 3D world, many enthusiastic specialists and PhD are giving their life-time effort to rendering photorealistic objects like milk, skin, water, feather, shadow, etc. No doubt that it is good to have all these physical models about the rendering. When it comes to practical application, we, however, have to made a tradeoff between quality and performance and most of the time, the result yield at the later choice. 阅读全文