Name:		Brian Byrne
Login:		byrne
Date:		12/16/05
Class:		CS 559
Assignment:	Project 3

TECHNICAL CHALLENGES:

	- Skybox:
		A full skybox is implemented that simulated the effect of
		a panoramic view. Done by having carefully stretched
		textures and moving the box with the camera.

	- Billboard Object:
		A two dimensional object that always faces the user. Is done
		by have the normal of the polygon have the direction as the
		negative forward vector of the camera, thus they are always
		facing towards eachother.

	- Complex Procedural Model:
		A hilly ground terrain is formed by loading a targa model
		with heights based on blackness, and then generates a mesh
		through a procedural call, giving a more realistic ground.
		The environment and road are also generated by using targa
		maps. The flag model is also generated through a functional
		procedure call.

	- Culling:
		Anything outside the field of view is culled. This is done by
		finding distance vector of the object and then, by
		use of dotproducts, the angle between the camera's forward
		vector and the distance vector gives the angle between them.
		If the object's radius made the object outside the field of
		view, the object is skipped completely from being drawn.

	- Level of Detail:
		The flag loses detail as the camera moves away from it. This is
		testable by having the world cam far away from the object, and
		having the view cam close up to the flag. As the world cam moves
		away, the detail level of the flag drops.

	- Particle Systems:
		In place is snowfall consisting of 20,000 flakes given a 
		simulated freefall. There also exists a smoke stack for each
		house that reduces smoke sprite's size as it rises.

	- Fake Physics Effects:
		A waving flag is done using a physics hack the uses simple 
		sine and cosines to give the flag a wavy look. Also implemented
		are snowballs that accelerate downwards due to gravity as they
		rise and fall.

	- Very Complex Behaviors:
		One of the snowmen behaviors is to throw a snowball at the camera.
		But, to make this effective and still be realistic (the snowball
		can't fly in a straight linear interpolation), many physics
		calculations are performed to determine the proper direction,
		power, and velocity for the snowball to hit the camera at its
		peak height.