Sam Alter, CSE 167 Final Project
Circulatory System Simulation

This project is an attempt to simulate an animated circulatory system via OpenGL.
The main components of the simulation are Vessels and Cells.
The vessels form a data structure linked via pointers to make a path that can trace
itself back to the root.
The cells are placed in a particular vessel via two position coordinates.  One,
a translational coordinate that follows the center of the vessel, no matter what direction
the vessel's path is taking.  The second is a radial vector on the cross-section
of the vessel's  path that polar coordinates (angle in radians, and radius from
center of the vessel).  I used these instead of X,Y,Z coordinates because I wanted 
to be able to calculate vessels in relation to each other and cells in relation to 
vessels. I basically had to do nearly all of the trig calculations myself, but I 
viewed it as a chance to refresh my memory.

The entire system has one arbitrary root vessel, with one hardcoded starting point. 
All other positions, including Vessels and Cells, are calculated recursively starting 
from that root.
I added heart vessels later on to provide added animation effects.  They are like 
normal vessels except their radius varies depending on the current simulation state.

The camera has two different modes:
The first mode which I call Omniscient Mode, is the starting mode of the simluation.  
It views the whole system head-on with lighting turned off to see a view of all the 
animation at once.  This is nice to watch but doesn't show all of the cells' movements, 
orientations, etc.
The second mode toggled by pressing 'c' is Cell Targeting Mode.  In this mode, the 
camera goes inside the vessel and follows a randomly selected cell closely to give 
a more animated view of the cell's movement.  This mode also has lighting turned on 
for a 'real world' effect.

All in all, I found this project to be very rewarding and met my objectives considering 
the time restraints.  I didn't get to implement lungs and hemoglobins and oxygen meters 
but despite that I enjoyed working on this project.  If I had more time I would also sew
up the bridges between 

Here are the program controls:
't' or 'T'   - Toggles Cell Targeting Mode and Omniscient Mode
'C'          - Creates a Cell in the simulation
'c'          - Removes a Cell from the simluation
'M'          - Increases the resolution of the drawn objects
'm'          - Decreases the resolution of the drawn objects
'w'          - Turns on Wireframe mode (Recommended for Cell Targeting Mode)
'S'          - Increases the speed of the simulation
's'          - Decreases the speed of the simulation
Arrow Keys   - In Omniscient mode, the vertical keys scroll up and down,
               and the horizontal rotate.
               In Cell Targeting Mode, all the arrow keys randomly re-choose a cell 
               to follow.