Raytracer in shadertoy

[ConfusedSky]

Haven't figured out refraction yet, but I got this to work in shadertoy rendering at 60fps with some code and scene changes.

https://www.shadertoy.com/view/3tlXRl

[bitviper-cloud]

Has any managed to get an iterative and nonrecursive version of the code working. I'm close but cannot get both the reflection and refraction working together?????