光谱玻璃

Define glass objects as signed distance functions and ray-march them in a full-screen shader over a background texture. For each pixel, pick N wavelengths across 380-700nm with stratified jitter, compute each wavelength's index of refraction from a Cauchy equation parametrised by refractive index and Abbe number, and refract the view ray through entry and exit surfaces. Sample the background along each refracted ray, weight by that wavelength's CIE x/y/z matching values and Fresnel transmittance, then sum and convert XYZ to sRGB. Add temporal accumulation to hide the stratification noise.