3d: 3draytrace
2d: raytrace2d
2d top-down visual: raytrace2dvisualization
(yes i called the 2d projects "raytrace" but really it's sphere tracing, a type of ray marching)
Wow looks nice!
Very nice. 
i updated the 3d one just now to a. make it actually raytracing, and b. add color, because why not