This is the first version.

So far I only have circle intersections. The path tracer only returns the final direction of the rays for the color value, no material color or emmisions so far. 

WASD and Up and Down Arrows to move (Hold Shift to move slower). Hold T and Left and Right Arrows to Tilt. Right-click and drag to Rotate. C to create Spheres. (Removed due to WebGL not liking buffers in shaders)