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- Turbo Sliders AI Information
- ----------------------------
-
- This document explains how you can modify the AI players in
- Turbo Sliders and how you can make new driving lines for the
- AI players. AI support was added in version 1.0.6.
-
-
- MODIFYING AI PLAYERS
-
- File ai/aiplayers.dat defines all the AI players in the game.
- You can change the name, color or skill for every player or
- add your own new players. A new AI player is added with a line
- "AIPlayer <name>". It gets these properties:
-
- * Skill: The skill group to which the player belongs to. When AI players
- are added to a race, they are picked among the players that belong
- to the right skill group. Skill value does not define as such how
- good a driver the player is, and if you want, you may make some skill
- groups have both good and bad players.
-
- * SpeedFactor <val>: This value is multiplicated by the optimal
- speed value given by driving line files. If you make this value less
- than 1.00, the player drives slower than it should. Some tracks with
- jumps may override this value to make the players be able to complete
- critical jumps.
-
- * LapClass <val1> <val2>: These values define how good driving lines the
- car picks. When a new lap is started, one new driving line is selected
- by random. The first value is the proportion of the best laps that are
- not possible. The second value defines the other end, the greater it
- is the more bad laps are possible. For example, if the values are
- 0.0 and 1.0, any driving line can be taken. If the values are 0.0 and 0.5,
- only the best half of the laps are considered. If the values are 0.9 1.0,
- only the worst tenth of the laps are possible.
-
- * BestCarProb <val>: This is the probability (in percentage) for the
- AI player to select the best car (according to driving lines) for a race
- if it can choose which car to take.
-
- * MaxSpeedUp <val>: The AI player can decide to increase SpeedFactor at most
- by this value if a human player is ahead of it. The addition cannot make the
- value more than 1.00, though. Valid range from 0.0 to 0.5.
-
- * MaxSpeedDown <val>: The AI player can decide to decrease SpeedFactor
- at most by this value if a human player is behind it. Valid range is from
- 0.0 to 0.5.
-
- * MaxLapClassChange <val>: If this is more than 0, AI player can decide
- to prefer better or worse laps than normally (to make the race tighter
- against human players). The valid range is from 0 to 0.5. If the value
- is 0, all laps within LapClass are possible. If it is 0.5, only half
- of the laps may sometimes be possible.
-
- * Color <color>: This defines the color of the player. The color is
- defined either in a short or long form. In the short form, there
- is only one solid color (given in hexadecimal number). In a long form,
- there is first a number defining color mode and then three colors.
-
- When any of these values is defined in the file, all the following
- players will have the previous value until a new value is given.
- By default, all players in the same skill level have the same values
- for SpeedFactor, LapClass, BestCarProb etc. but if you want, you can
- change them anywhere.
-
-
- CREATING DRIVING LINES
-
- AI players can only drive in a race if they have driving lines
- made for the track and their car. If you want to drive against
- AI with a new car or track, you need either to get a new driving line
- file from someone else or make one yourself. The driving lines are
- defined in the lap files under the ai directory. The game first
- tries to find <trackname>.lap.gz, then <trackname>.lap, then
- <trackname>.lap.new.gz and finally <trackname>.lap.new. If the
- file ends with gz, it is packed with GNU zip. You can get it from
- http://www.gzip.org/ but many other unpacker programs can open gz files,
- too. The unpacked version of the lap file is a text file but generating
- laps manually is virtually impossible. Below is explained what you should
- do instead.
-
- To make new driving lines, you must run the game with the command
- line option "-airecord 1". See the bottom of this document on
- how to do this if you don't know. If you run the game with this option
- and drive a track alone without any AIs or other players, your laps
- are recorded. You will see text "AIRec" in the corner and all other laps
- but the very first one will be appended to file ai/<trackname>.lap.new.
- After you have recorded a set of laps, you can open the file with a text
- editor and remove laps that were bad. A lap definition is started with "Lap"
- and ended with "End" so remove them and everything between them to get
- rid of the lap. The recorded laps of a session are ordered by time. Note
- that if there already is a lap file, the new additions in lap.new are not
- taken into use until you either remove the lap file or append the laps
- in lap.new to it.
-
- One big problem is that if you drive very close to obstacles, it is
- very probably that the AI drivers will often hit them. This is
- especially true with cars like Slider which require lots of sliding.
- The AI can't follow the lines exactly and it will result in
- problems. There is a special command line option that can be used to
- test which driving lines are working. If you run the game with
- "-lapdebug 1", the game runs in the windowed mode, AI Fill is 20 and
- an accelerated ghost race is driven. All laps are tested in order
- (ignoring LapClass). Debug information about laps is put to output.txt
- and by searching lines which do not contain "coll: 0" you can find
- which laps caused the AI to collide on obstacles. If you want to make
- your lines as good as possible, set AI skill to 5/5 and the number of
- laps to something big like 20, and then make the AI drive a
- race. Then, check output.txt, open the lap.new file and remove the
- laps that caused collisions. This can be very painful since some
- tracks can require you to remove many good lines and drive new lines
- until you finally find working ones. Try not to go very close to
- obstacles especially in inner curves.
-
- About 10-20 laps per a track and a car is probably a good number. The
- default driving lines were usually done so that about 50 % of the laps
- are good ones and the rest get gradually worse. This way, the high skill
- AIs will get the best laps and the lower skill AIs get slower laps and
- more variation.
-
- If the track contains jumps that must not be missed (like Westleap),
- you can set MinSpeedFactor by adding a line like "MinSpeedFactor 0.95"
- in the lap file. All driving lines that follow that line will be marked
- such that even bad AI players cannot have speed factor less than that.
- This way, even low skill AIs should be able to get over the jumps.
-
- If you are making driving lines for a set of cars for a track, it
- is usually best to work with one car at a time. Save the finished lap.new
- files for certain cars to different directories and finally, when every
- car is finished, combine them all to one lap file. If you want, you can
- then pack the file with gzip to save space (as was done with the default
- lap files).
-
-
- RUNNING THE GAME WITH DIFFERENT COMMAND LINE OPTIONS
-
- In Windows, there are at least two ways on how you can run
- the game with different command line options. The first one
- is to use command prompt (assuming Windows XP or similar):
-
- 1) Select Start->Run... and write cmd.exe and press enter.
- 2) Go to the Turbo Sliders directory, for example like this:
- cd "C:\Program Files\JollygoodGames\Turbo Sliders\"
- (or wherever you installed the game).
- 3) Run the game by adding your command line options after sliders.exe.
- For example, if you want to use "-airecord 1", write
- "sliders.exe -airecord 1" and press enter.
-
- Another possibility is to create a new shortcut of sliders.exe
- using Windows Explorer. To do this, go to the Turbo Sliders
- directory, right-click sliders.exe and select "Create Shortcut".
- Now right-click the new "Shortcut to sliders.exe" and select
- "Properties". Now, add your command line parameters in the end of
- the target line. For example, make it like this:
-
- "C:\Program Files\JollygoodGames\Turbo Sliders\sliders.exe" -airecord 1
-
- Click Ok. Now you can run the game with the given command line
- parameters by double-clicking the shortcut. You can also rename
- the shortcut to something else, like "sliders_airecord.exe"
- to know what it is (and make new ones for other command line options).
-