Unity3D – Game Engine – Script Lifecycle Flowchart
My website: http://www.lucedigitale.com
Ref: http://docs.unity3d.com/Manual/ExecutionOrder.html
Unity 3D – CSharp – Event Functions – Inizialization – Update – GUI – Mouse – Physics
Unity 3D – CSharp – Event Functions – Inizialization – Update – GUI – Mouse – Physics
To create videogames Unity3D give us special functions to manage special operations as variable inizialization, updating, physic management.
using UnityEngine;
using System.Collections;
public class MyScript : MonoBehaviour
{
// Initialization Events
// ******************************************
void Awake ()
{
// first inizialization
Debug.Log("Awake called.");
}
void Start ()
{
// second inizialization
Debug.Log("Start called.");
}
// Regular Update Events
// ******************************************
void FixedUpdate ()
{
// frame indipendent update
// use this function to drive physic
Debug.Log("FixedUpdate time :" + Time.deltaTime);
}
void Update ()
{
// update at every frame
Debug.Log("Update time :" + Time.deltaTime);
}
void LateUpdate ()
{
// update at the end of the frame rendering
Debug.Log("Late Update");
}
// GUI Events
// ******************************************
void OnGUI()
{
// draw here labels, buttons and other Graphic User Interface elements
GUI.Label(labelRect, "Game Over");
}
// Mouse Events
// ******************************************
void OnMouseOver()
{
// do something if mouse is over
}
void OnMouseDown() {
// do something if mouse is down
}
// Physics Events
// ******************************************
void OnCollisionEnter(otherObj: Collision)
{
// do stuff if there is a collision
}
void OnTriggerEnter(Collider other)
{
// do stuff if there is an object that overlap the trigger
}
} // END MyScript
My website: http://www.lucedigitale.com
Ref: http://docs.unity3d.com/Manual/EventFunctions.html
Unity3D – C# – Basic Syntax
Unity3D – C# – Basic Syntax
First you need call basic namespace and nest all the code inside a class with the name of your script, see the example below.
Basic Structure
Project Window> RMB> Create> C#> name it ‘MyFirstScript’> double click to open ‘MonoDevelop’ editor
// call basic namespace of Unity3D
using UnityEngine;
using System.Collections;
// MonoBehaviour is the base class every script derives from
// class nameofmyscript : derived from MonoBehaviour
public class MyFirstScript : MonoBehaviour {
// Unity3D exclusive function - Use this for initialization
void Start () {
}// END Start()
// Unity3D exclusive function - Update is called once per frame
void Update () {
}// END Update()
}// END of class MyFirstScript
Variables and Fuctions
// call basic namespace of Unity3D
using UnityEngine;
using System.Collections;
// MonoBehaviour is the base class every script derives from
// scope class nameofmyscript : derived from MonoBehaviour
public class MyFirstScript : MonoBehaviour {
// declare variables
// scope type nameofvariable = value
public int myInt = 5; // you can setup it inside inspector
private int myInt2 = 6; // you can't setup it inside inspector
// Unity3D exclusive function - Use this for initialization - void because it has no type
void Start () {
myInt = MultiplyByTwo(myInt);
Debug.Log (myInt);
}// END Start()
// Your custom fuction
// scope type functionname (type variable)
public int MultiplyByTwo (int number)
{
int ret;
ret = number * 2;
return ret;
}
// Unity3D exclusive function - Update is called once per frame - void because it has no type
void Update () {
}// END Update()
}// END of class MyFirstScript
CSharp – for Statement
CSharp – for Statement
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int number = 5;
for(int i = 0; i < number; i++)
Console.WriteLine(i);
// the console will close if you press Return on the keyboard
Console.ReadLine();
}
}
}
The result is:
0
1
2
3
4
CSharp – if Statement
CSharp – if Statement
With if statement you can set up conditional blocks of code.
if – else if – else
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
Console.Write("Enter a character: ");
char ch = (char)Console.Read();
if (Char.IsUpper(ch))
{
Console.WriteLine("The character is an uppercase letter.");
}
else if (Char.IsLower(ch))
{
Console.WriteLine("The character is a lowercase letter.");
}
else if (Char.IsDigit(ch))
{
Console.WriteLine("The character is a number.");
}
else
{
Console.WriteLine("The character is not alphanumeric.");
}
} // End Main()
}
}
if – nested
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
Console.Write("Enter a character: ");
char c = (char)Console.Read();
if (Char.IsLetter(c))
{
if (Char.IsLower(c))
{
Console.WriteLine("The character is lowercase.");
}
else
{
Console.WriteLine("The character is uppercase.");
}
}
else
{
Console.WriteLine("The character isn't an alphabetic character.");
}
} // End Main()
}
}
if – boolean
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
// Change the values of these variables to test the results.
bool Condition1 = true;
bool Condition2 = true;
bool Condition3 = true;
bool Condition4 = true;
if (Condition1)
{
// Condition1 is true.
}
else if (Condition2)
{
// Condition1 is false and Condition2 is true.
}
else if (Condition3)
{
if (Condition4)
{
// Condition1 and Condition2 are false. Condition3 and Condition4 are true.
}
else
{
// Condition1, Condition2, and Condition4 are false. Condition3 is true.
}
}
else
{
// Condition1, Condition2, and Condition3 are false.
}
} // End Main()
}
}
if – AND NOT
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
// NOT
bool result = true;
if (!result)
{
Console.WriteLine("The condition is true (result is false).");
}
else
{
Console.WriteLine("The condition is false (result is true).");
}
// Short-circuit AND
int m = 9;
int n = 7;
int p = 5;
if (m >= n && m >= p)
{
Console.WriteLine("Nothing is larger than m.");
}
// AND and NOT
if (m >= n && !(p > m))
{
Console.WriteLine("Nothing is larger than m.");
}
// Short-circuit OR
if (m > n || m > p)
{
Console.WriteLine("m isn't the smallest.");
}
// NOT and OR
m = 4;
if (!(m >= n || m >= p))
{
Console.WriteLine("Now m is the smallest.");
}
// Output:
// The condition is false (result is true).
// Nothing is larger than m.
// Nothing is larger than m.
// m isn't the smallest.
// Now m is the smallest.
} // End Main()
}
}
My Website: http://www.lucedigitale.com
References:
http://msdn.microsoft.com/it-it/library/5011f09h.aspx
http://csharp.net-tutorials.com/basics/if-statement/
