I feel I should link a function mode excel ray tracer a friend wrote in 2004. https://github.com/simon-frankau/excel-ray-tracer https://github.com/simon-franka

I feel I should link a function mode excel ray tracer a friend wrote in 2004. https://github.com/simon-frankau/excel-ray-tracer https://github.com/simon-frankau/excel-ray-tracer