折射与色散的交互讲解

Render everything behind the glass object into a render target each frame, then hide the backbuffer copy of the object. In the glass material's fragment shader, compute a refraction vector from the view direction and the surface normal, and sample the render target at screen UV plus that vector times a strength. For dispersion, loop over several slices with slightly different IOR values per channel and accumulate red, green and blue separately. Finish with a Fresnel term that blends in a reflection color and a Blinn-Phong highlight.