Collision checking speed:
	We must divide our world into segments
	Not today, but generally:
		Non-moving objects can be classified by location
		So we could check just the instances near us
		Can be done as a late step in level loading
		New non-moving objects must be added
		Not as helpful for moving objects
			We'd have to keep changing where they are!
			Speed with thick vs. thin floor

Today's main goal:
	What blocks a line from one point to another?

Marking an object:
	Will be useful
	We'll add it to the fragment shader
		This makes it pretty universal
		Guess that's ok...
	
Iterative solutions:
	We can calculate a vector from one to the other easy enough
	How far to move, though?
		A tiny bit:  Accurate, but slow
		A lot:  Can phase through things
		The distance to the nearest object:  Better
			Slow when passing something
			Fast in empty space
			If the nearest object is farther away than the goal, we can see the goal

So we need a nearest object function!
	Use fast check distance, since it should be fast
	Closest point if it's not fast

Given this:
	What are we looking at?

Settling the UI:
	Query tree or hash table
	I think at this point we're pretty well good on object definitions
		Kinda have to be

Stuff I'd consider important:
	HUD and aiming point
	Texture scaling
	Lighting

If somebody wants it:
	Vehicles
	Not jumping through platforms
	Bouncing on curved surfaces
		Easier after lighting, since we need normals then
	Non-first-person view
	Momentum when jumping
	Crouch/sneaking
	Fragments that aren't projectiles

Stuff I think would be fun:
	Rolling spheres (I had one in the engine last time)
	Ray tracing (I'd have to write it offline, then show you, cause it'll take forever)
		A few properties of our base class would have to change
		The rest of the code that would change is in gameobject.cpp