it just stencil & simple projection shadow(for vegetation). i want to give some other details but my english not enough for this.
Goes in the direction of the ICEnhancer for GTA 4.
Very good work. Do you use Shade-C or your own shaders? What about performance?
Water shader is my own. Bloom from aum(Slin's shader). Also PP antialias from here. Everything else is my own, or general shaders from wiki. Performans not good. 30 fps with HD3850. But i am working on it.