Arrow keys to move and look Space key to show shadowmap
I have no idea how to make a real raycaster, so I'm trying out something never before done and wow it works. No collisions yet. How it works: The main engine works just like any other raycaster, with a ray being "shot out" from the viewer for each column of pixels on screen. But instead of the usual "go here go there" kind of iterating, this calculates the intersection of that ray with a line between two points. That intersection must be tested to be 1) within range, 2) within view, and 3) within the boundaries of the line it intersected with. For each ray it checks every wall for an intersection, making sure each intersection is closer than the last. The upside is the FPS is constant; the downside is it gets more processing intensive the more lines are checked.
