unity3d 文档

EVAC-CITY

A starters guide to making a game like EVAC-CITY

Index

Introduction................................................................................................................................................3

Programming - Character Movement.........................................................................................................4

Programming - Character Animation.......................................................................................................13

Programming - Enemy AI........................................................................................................................18

Programming - Projectiles.......................................................................................................................22

Play EVAC-CITY

By David Lancaster

http://www.youtube.com/Daveriser

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Introduction

Hello and welcome to this tutorial. Below you'll find a detailed explanation from which you can make

the beginning of a game very similar to EVAC-CITY, a 2D top down survival alien shooter myself and

Daniel Wilkinson developed and which is currently free to play here:

Click to play EVAC-CITY

This tutorial will introduce you to the programming language C# of Unity 3D, Level Design in Unity

http://unity3d.com/unity/download

Here are some very intuitive video tutorials which will get you comfortable with the Unity 3D

interface:

http://unity3d.com/support/documentation/video/

Thank you for taking the time to look through this tutorial and I only hope it helps you abundantly in

your desire to become a skillful game developer.

Let's start with programming character movement!

David Lancaster

http://www.youtube.com/Daveriser

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Character Movement

Download the Example Projects

Then Open up the Unity project you have just created goto the assets folder and drag the Tutorial

Resouces folder you had downloaded and drag it into the assets folder.

Once this is done you can now save the scene Goto > File > Save Scene As...

Scene.

Firstly I'm going to create an empty game object and name it 'Player', to rename an object left click

over the name of the object in your Hierarchy and keep your mouse stationary over the object after

releasing left click for a second.. Then from the menu with your new game object selected, choose

(component – mesh – mesh filter), and (component – mesh – mesh renderer). In the mesh filter I am

going to select 'plane' which is made available from adding the above .fbx file to your assets folder.

new material. Select (transparent-diffuse) as the shader for your material.

Now in your player object's mesh renderer, select your PlayerMaterial in the materials tab. You should

now see what is displayed in the image on the next page:

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Okay our player is being rendered onto our plane! Now let's make sure he's tiled correctly. Select your

PlayerMaterial and set your X tiling to -0.2 and your Y tiling to -0.25. We are going to animate our

character by changing the tiling of the character dynamically over time! I set the Y tiling to -0.25 for

mathematical reasons, in the next tutorial we shall cover animation and if this is not set to a negative

value the animation wont run properly because of the way I have set up calculating which animation to

play. And set the X tiling to -0.2, I have no idea why it's a negative value I must have had a reason a

while ago when I wrote the animation code but the code likes it to be that way and I'm going to trust it.

going to keep on falling forever.

It's time now to script our character to move around. But first I should let you know, if you are new to

programming more than likely you're only going to understand bits and pieces of code at a time, to

understand it all at once takes experience, don't fret if you go ahead and implement the code in this

tutorial without understanding it all. Understanding comes over time with experience and it's normal

not to understand things.

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Right click in your project window and select (create – C Sharp Script) call your script 'AIscript', now

it's completely up to you how you organise your project window (we spell organize with an S in

Australia). In the future I wont tell you where to put the things you create in this tutorial but leave it up

to you to put things where you think they belong best. In this case I created a folder called 'scripts' and

will use the same script. You could create separate scripts but I personally like to keep things local.

public class AIscript : MonoBehaviour {

Any code highlighted blue in this tutorial is code that wont change, anything highlighted red is the code

I am indicating for you to change. If the code is simply a green color, it is completely new code with

no code which is preexisting.

Leave the Start and Update functions as they are, the Start function is called only once at the beginning

of the object's life which is using the script, and Update is called once every frame while the object is

alive.

Let's create a new function called FindInput(); This function will find the input which needs to be sent

to the remaining functions to determine what the character will do. This input is either going to be

player controlled or AI controlled. I am also going to add 2 more functions below FindInput, one will

FindPlayerInput();

} else {

FindAIinput();

}

}

void FindPlayerInput ()

{

}

void FindAIinput ()

{

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