Designing bots for POV-Ray Push-Ball v1.0
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When you design your own bot for Push-Ball you have many different
values that you can read, but you have ONE output option only. That
is the direction you want your bot to move.

You simply declare a vector called "VECTOR" which holds the direction
vector you want your bot to move in.

When designing bots you are allowed to use (read) the following input
values made my pushball.pov and pushball.inc:

pb_current   - The number your bot has.
pb_players   - Number of players (ball is not a player).
pb_botsize   - Diameter of each bot.
pb_fieldsize - Radius of the playing field
pb_goalrot   - Y Rotation of goals relative to bots' initial positions.
pb_power     - The influence each bot has on its own movement.
pb_inertia   - The influence inertia has on the bot's movements.
pb_maxspeed  - The maximum speed a bot can move.
pb_vibrate   - How much each bot vibrate (to add a random factor).
pb_seednr    - Controls the random initial positions and vibrations.

Furthermore, you are allowed to use (read) the following arrays:

pb_location     - The location for each bot. 0 is the ball.
pb_locationold  - The location for each bot in the previous frame.
pb_goalcenter   - The location of the center of the goals.

When reading the arrays, use pb_location[pb_current] to get YOUR location.
Likewise with pb_locationold.
Use pb_goalcenter[pb_current] to get the center of YOUR goal (the goal
that you must defend!)

You are not allowed to read any other values used by the pushball
include file.
You are also not allowed to overwrite any of the above values, or
any other values used by the pushball include file.
Simply just don't #declare anything that starts with "pb_".

You are of course allowed to create and use your own variables, but I'll
suggest that you #local them instead of #declaring them, so other bots
won't read you data, by intention, or by accident.
The only variable you need to #declare is "VECTOR", which is the output
of your bot that the pushball include file will read.

That should be about it, have a look at the sample bots!
