Ray tracing made possible on 42-year-old ZX Spectrum: ‘reasonably fast, if you consider 17 hours per frame to be reasonably fast’
Ray tracing has been around a surprisingly long time in computer graphics. It was used to generate images in the 1960s, and by the ’80s new algorithms had been created including path tracing. Yet the “holy grail of rendering” remained a distant dream for early home machines like the ZX Spectrum. You need only look…