run as: terrain

Features: 
	Provides an interface in which the user can choose to do a variety
	of functions on a grid with ARCASCII format, including animation, 
	3d and 2d rendering, flow direction, flow accumulation, and
	information printing about the grid. 

Prompt Commands: 
	3dterrain MAPNAME = renders file MAPNAME in 3d
	2dterrain MAPNAME = renders file MAPNAME in 2d
	animate MAPNAME = animtes a cube following flow direction
	        on map MAPNAME
	flowDir MAPNAME OUTNAME = calculates flow direction on 
		MAPNAME and outputs it to OUTNAME
	flowAcc MAPNAME OUTNAME = calculates flow accumulation 
		on MAPNAME and outputs it to OUTNAME
	printInfo MAPNAME = prints information about MAPNAME
	exit = exits the program

Menu Options: 
	-available on right-mouse click
	-can choose to render in filled polygon or outline mode
	-can cycle through three color schemes

Keyboard Options in 2D mode: 
	q = quit
	w = toggle filled or outline mode
	e = change the color scheme

Keyboard Options in 3D mode:
	q = quit
	w = toggle filled or outline mode
	e = change color scheme
	r = decreases the relief of the terrain
	R = increases the relief of the terrain
	t = resets the field of view
	y = resets the car's position (in animation mode only)
	> = decreases the resolution of the image
	< = increases the resolution of the image
	x, X = rotates the terrain in the positive/negative x-direction
	c, C = rotates the terrain in the positive/negative y-direction
	z, Z = rotates the terrain in the positive/negative z-direction
	s, S = moves the terrain in the positive/negative x-direction	
	d, D = moves the terrain in the positive/negative y-direction
	a, A = moves the terrain in the positive/negative z-direction

	b, B = moves the camera in the positive/negative z-direction
	rightArrow = rotates the camera right
	leftArrow = rotates the camera left
	upArrow = rotates the camera down
	downArrow = rotates the camera up