This should be the standard book for classical mechanics, imo.
A prominent particle theorist has just released this preprint, claiming a “candidate nonperturbative lattice definition of the Standard Model”.
Edit: to editorialize a bit, this is potentially one of the most significant results in the field in the last five years.
It's a 2D geometric optics simulator, so no diffraction or interference. Every ray carries a single wavelength, glass dispersion comes from a Cauchy fit (n_d and Abbe number), and reflection vs. refraction at each surface is picked randomly using the exact Fresnel equations. The picture builds up by Monte Carlo averaging of millions of rays, and colors come from the CIE 1931 curves.
Happy to answer questions!