Integrating Bots and Damage Mechanics in Torque Game Engine
This tutorial guides users through the process of adding AI bots to the Torque Game Engine and implementing weapon damage mechanics for both players and bots. It outlines the steps for scripting AI behavior, creating paths for bots to navigate, and managing AI entities through the AIManager script. Additionally, the tutorial explains how to apply weapon damage from projectiles and radius damage effects. Users will learn to modify scripts, create paths, and ensure bots interact correctly within the game environment.
Integrating Bots and Damage Mechanics in Torque Game Engine
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Presentation Transcript
Torque Bots and Damage CIS 487/587 Bruce R. Maxim UM-Dearborn
Adding a Bot - 1 • The code found in the bot.cs script file was taken from a more complicated A.I. script called, aiPlayer.cs, which is part of the starter.fps example. • Copy the bot.cs script to your tutorial.base/server directory. • Open the game.cs script file located in the tutorial.base/server directory
Adding a Bot - 2 • Add the following line of script to the function onServerCreated( ) add it to the end of the list like usual exec("./bot.cs"); • Besides defining how our bot follows a given path, the bot.cs script also defines a special object called AIManager which is responsible for managing all bots in general • For our AIManager to work, we'll need to add some code to start and stop it respectively.
Adding a Bot - 3 • Add the highlighted lines to the onMissionLoaded() function: new ScriptObject(AIManager) {}; MissionCleanup.add(AIManager); AIManager.think(); • Next, we need add a of line of code to the onMissionEnded() function to delete the manager object when our game is done. AIManager.delete();
Adding a Bot - 4 • When done, close and save the "game.cs" script file. • Note: We haven't laid-out our path yet with the Mission Editor so the function AIManager::spawn( ), which actually spawns the bot, will simply spawn a regular bot without specifying a path to follow.
Path Definition - 1 • Run the test application by double-clicking torqueDemo.exe, which is located in the example directory. • When the main menu comes up, click the "Load Mission!" button. A mission named, "F World", should load. • After the mission starts, move forward a bit and turn around. You should see a motionless bot just standing there.
Path Definition - 2 • Find a relatively flat area where it will be easier to create a path and hit F11 to open the Mission Editor and switch to "World Editor Creator" mode. • Expand the tree in the lower right half of the screen by clicking the "Mission Objects" entry. Expand it out like so: "Mission Objects->Mission"
Path Definition - 3 • In the Mission directory, you should see several entries to choose from. • Click the entry labeled "Path" just once to create a new Path object. Name the Path object, "myPath". • In the MissionGroup tree, which is in the upper right hand side of the editor, expand out the tree and find the node labeled "myPath".
Path Definition - 4 • Make this node the current selection by holding down the "Alt" key while clicking it with the mouse. • If done correctly, the selection color of the "myPath" entry should change from white to gray. • Make sure the path markers get grouped under our new Path object.
Path Definition - 5 • Return to the tree control in the lower right hand corner and click the “PathMarker” in the "Mission" directory. • Name the new PathMarker, "myMarker0" and check to make sure it was correctly grouped under "myPath" in the "MissionGroup" tree control. • Repeat the process to create two more PathMarkers called, "myMarker1, and "myMarker2".
Path Definition - 6 • Make sure to place the markers far enough apart so you can see your bot run around. • Save the mission file by selecting and exit completely out of the game. • return to the bot.cs script file located in the tutorial.base/server directory and edit the function AIManager::spawn() • Comment out the line of code that creates "Bot_1" and uncomment the code below it that creates "Bot_2“ and save bot.cs.
Test Bot • Run the test application again by double-clicking torqueDemo.exe. • If everything was done correctly, you should see a new bot called "Bot_2" running around your new Path object's PathMarkers. • If not, make sure that your PathMarkers are not too low on the terrain and that they're correctly grouped under the "myPath" object.
Weapons Damage • This tutorial demonstrates how to apply weapons damage to both players and bots when a weapon's projectile collides with them and how to calculate "radius damage", which allows an exploding projectile to damage a player without making direct contact. • This tutorial not only requires the Tutorial Base application as its starting place, but also requires the addition of the Weapons and Bot Path-Finding tutorials.
Damage - 1 • Copy the scripts radiusDamage.cs and shapeBase.cs to your tutorial.base/server directory. • Open the game.cs script file located in the tutorial.base/server directory and add the following script lines to the function onServerCreated() exec("./radiusDamage.cs"); exec("./shapeBase.cs");
Damage - 2 • Copy the player_dieknees.dsq animation file to the /tutorial.base\data\shapes\player directory. • Open the player.cs script file located in the \tutorial.base\data\shapes\player directory and following highlighted line of script to the datablock TSShapeConstructor sequence12 = "./player_dieknees.dsq die";
Damage - 3 • This is the last change to this player.cs save the file and close it. • Open the player.cs script file located in the tutorial.base/server directory and add the following line of script to the datablock PlayerShape className = Armor;
Damage - 4 • Add this function to the bottom of the player.cs script. function Player::playDeathAnimation( %this ) { %this.setActionThread( "die" ); } • Add this function next. function Armor::damage (%this, %obj, %sourceObject, %position, %damage, %damageType ){…}
Damage - 5 • Add this function next. function Armor::onDisabled( %this, %obj, %state ) { …} • This is the last change to this player.cs save the file and close it. • Open the rocket_launcher.cs script file located in the tutorial.base/server directory
Damage - 6 • Modify the datablock RocketProjectile datablock like so: directDamage = 50; radiusDamage = 25; damageRadius = 1.5; • Then modify the function RocketProjectile::onCollision function RocketProjectile::onCollision ( %this, %obj, %col, %fade, %pos, %normal ){ … }
Damage - 7 • That's it for rocket_launcher.cs save the file and close it. • Run the test application by double-clicking torqueDemo.exe • You should now be able to shoot and kill the path-finding bot as well as blow your self up by shooting at your player's feet.
