FPS_Tutorial_3.pdf

Creating a First Person Shooter (FPS)

Part 3

Author: Graham McAllister

Revised by: Jeff Aydelotte &

Amir Ebrahimi

Time to complete: 34 hours

Last Revision: 10July2009

Contents

1. Part   3:   Advanced   FPS

Prerequisites 

Setting up 

Waypoints 

Robot AI 

Robot Damage 

Ragdolls 

Sound 

GUI 

Finally... 

The end of the beginning... 

Part 3: Advanced FPS

This advancedlevel tutorial 

extends upon the previous 

FPS tutorials by introducing 

game elements such as 

waypoints, enemy AI, 

ragdolls and animation.

Prerequisites

This tutorial assumes that you are familiar with the Unity interface and basic scripting 

concepts. Additionally, you should already be familiar with the concepts discussed in 

Part 1 and 2 of the FPS tutorial series.

Setting up

We’re going to build upon the previous FPS tutorial, so we’ll begin by opening that:

Open the previous project (FPS Tutorial 2).

Waypoints

This section will introduce waypoints to our game, these are used to inform the robots  

of the path that they can walk around.  Let’s add three waypoints to our game:

Create an empty game object and rename this to Waypoint.  Make sure the 

game object is placed approximately one meter above the ground level.

Add AutoWayPoint script to Waypoint.  Notice how the empty game object now 

displays a W in the Scene View.

Duplicate the WayPoint game object twice and arrange the waypoints in a tri

angle shape (position quite far apart).

Check that the waypoints are visible to each other by firstly clicking on any way

point then selecting Update Waypoint from the context menu of the AutoWay

Point script (the rightmost button on the component in the Inspector View).  A 

green line will be drawn between visible waypoints, a red line for those which 

don’t have a clear line of sight.

We have now described the path that an enemy can walk around, now let’s add an 

opponent to the scene.

Robot AI

This section will add an enemy robot to our scene.

Select Robot Artwork/robot and drag it into the Scene View making sure all of 

the robot is above the ground.

Let’s give the robot some behavior.

Add WeaponsScripts/AI to robot.  In the AI script section or robot, assign the FPS 

controller as the target (so the robot knows who to hunt down).

Add the AIAnimation script to the robot.  This controls the animation of our ro

bot (when to run, when to aim etc).  This communicates with the AI script to 

ﬁnd out what the AI script is currently doing, e.g. are we running, shooting etc.  

It then crossfades the animations to provide a smooth transition.

Now we need to make the robot controller object a little larger so that he doesn’t in

tersect with the ground.  This is because the character controller which is used to pre

vent the enemy from moving through walls is using a capsule to represent the AI.  We 

need to make this capsule a little larger to match the actual graphics, this way he will 

not intersect with the ground anymore.

Select the robot, then in the Inspector View modify the height and radius values 

of the Character Controller component so that it encloses the robot.  Press play 

to make sure it works correctly.

Try making the height and radius values smaller and larger to see the difference.

Now we need to give the robot the ability to ﬁre his gun.  The robot is continuously 

moving and animating.  When he shoots his gun we play an animation on the hands 

and the graphical gun then spawn the rocket from transform relative to the robot. 

This transform does not animate, it is simply placed approximately at the point where 

the gun will be when the shoot animation ﬁres the rocket.

Create an empty game object and make it a child of the robot (use the hierarchy 

view).

Rename the game object gun_spawn.

Now we need to place it properly.  In the transform inspector select Reset from 

the context menu, then move it forward in the zaxis.

Add the rocket launcher script to the gun_spawn game object.  Assign the 

rocket prefab to the projectile variable.

Make a prefab of this robot, call it Robot.  This will allow you to create more 

enemies easily.

Play the game and check that the robot ﬁres at you.

Although you can shoot the robot, it is not conﬁgured to take damage, we’ll remedy 

this in the next section.

Robot Damage

Attach the CharacterDamage script to the Robot prefab.

Play the game, shoot the robot with the machine gun and he should disappear.

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