One ：Transform

        Transform Components are Unity3D One of the key points , Mainly due to controlling the rotation of objects 、 Move 、 The zoom .

/*
 Member variables ：
position: In world space coordinates transform The location of .
localPosition: The position of the transformation relative to the parent . If the transformation has no parent , So equivalent Transform.position
eulerAngles: Rotation in the world coordinate system ( Euler Angle ).
localEulerAngles: The transformation rotation angle relative to the parent .
right: Right direction in the world coordinate system .( Red axis of world space coordinate transformation . That is to say x Axis .)
up: Up in the world coordinate system .( The green axis of coordinate transformation in world space . That is to say y Axis .)
forward: The forward direction in the world coordinate system .( The blue axis of coordinate transformation in world space . That is to say z Axis .)
rotation: Rotation in the world coordinate system ( Four yuan number ).
localRotation: The transformation rotation angle relative to the parent .
localScale: Scale relative to parent .
parent: parent object Transform Components .
worldToLocalMatrix: The point of matrix transformation changes from world coordinates to self coordinates ( read-only ).
localToWorldMatrix: The point of matrix transformation changes from its own coordinates to world coordinates ( read-only ).
root: The name of the root object in the object hierarchy Transform Components .
childCount: Number of sub objects .
lossyScale: Global scaling ( read-only ).
/*

transform.position=new Vector3(0,0,3);// Position shifting 
transform.rotation=Quaternion.Eular(0,45,0);// Position rotation   Y Shaft rotation 45 degree 
transform.localScale=new Vector3(2,2,1); // The zoom 

// Member method 
transform.Translate(0,0,3);// Position shifting   =(Vector3.forward*3); =(new  Vector3(0,0,3)) Move forward 
transform.Rotate(0,45,0);// around Y Shaft rotation 45 degree 

Two ： vector （Vector3）

A quantity that has both magnitude and direction is called a vector . In space , A vector is represented by a directional line segment . It can be used to describe physical quantities with two attributes of size and direction , For example, the speed at which an object moves 、 The acceleration 、 Camera viewing direction 、 The force on a rigid body is a vector .

 

  3、 ... and ：GameObject

GameObject and gameObject The difference between ：

        GameObject Is the base class of the game object class

        gameObject Is the script mounted object

Method :

Find(、FindWithTagO、FindGameObjectsWithTagO etc.

1） Find... By name :
GameObject player = new GameObject("Player");GameObject go=Gameobject.FinPlayer”);
2） adopt tag Tag to get a single GameObject :
GameObject go=GameObject.FindWithTag(Player”);
GameObject go=GameObject.FindGameObjectWithTag '(Player”);

3） Get multiple groups of game objects through the game tag :
GameObject[]go=GameObject.FindGameObjectsWithTag Player"); Component reference function :
GetComponent
Get the components
GetComponents
Get the list of components （ When used for multiple components of the same type ）
GetComponentInChildren Get on an object or sub object
Such as :
ScriptName other=GameObject.GetComponent<ScriptName>():/ Add script on object print(other.name);// You can reference the name in the script through the object
 

Four :Time

Time.time： Indicates the time from the beginning of the game to the present , Will stop calculating as the game pauses .

Time.deltaTime： Represents the time from the previous frame to the current frame , In seconds .

Time.timeScale： Time scaling , The default value is 1, If set <1, Indicates that time slows down , If set >1, Indicates that time is speeding up , Can be used to speed up and slow down games , Very useful .

// Case study 1： use deltaTime Control object movement 
	public GameObject cube;
	float speed = 3f;
	void Update () 
    {
		cube.transform.Translate(Vector3.forward * Time.deltaTime * speed);
    }

 

5、 ... and ： Clone game objects

// Clone the GameObject at the preset position

GameObject go1=Instantiate(cube);

// Clone the game object in a fixed position

//Quaternion.identity The GameObject does not rotate ：Quaternion(0,0,0,0)

GameObject go2 =Instantiate(cube,new Vector3(0,0,5),Quaternion.identity);

6、 ... and ： Destroy game objects

Destroy Destroy the objects in the scene, but the memory still exists , Or not used again for some time , To destroy and free memory , This avoids frequent read and write operations to memory , The system collector will periodically clean up objects that are not referenced in memory , It's likely that there are places where you still refer to the object, where you don't even know , Or where you ignore , Direct destruction will lead to the reference error of empty reference in the reference place .

// For example, if you want to destroy the under an object 10 Sub objects , Suppose you want to destroy A Under an object a0--a9,10 Sub objects 


///<summary> 
/// The script hangs on A On objects 
///  <summary> 
    public class AGameOnject: MonoBehaviour  
    {  
 
         void Start ()  
         {  
             for (int i = 0; i < transform.childCount; i++) 
             {  
                Destroy (transform.GetChild (i).gameObject);  
             }  
         }  
 
     }  

Destroy(go1);    // Destroy the object directly go1

Destroy(go2,3);   // stop 3 Destroy the object in seconds go2

7、 ... and ： Find game objects

Find game objects by name

GameObject  cube1=GameObject.Find("Player");

GameObject  cube2=GameObject.FindWithTag("Player");

// There are three ways to get game objects ：

//1. Get... By object name ：objCube=GameObject.Find("Cube");

// for example ：

private var objCube:GameObject;
private var isCubeRoate=false;

function Start () {
  objCube=GameObject.Find("Cube");
}

function Update(){
  if(isCubeRoate){
     objCube.transform.Rotate(0.0f,Time.deltaTime*200,0.0f);
  }
}

function OnGUI(){
  if(GUILayout.Button(" rotate ",GUILayout.Height(50))){
     isCubeRoate=true;
  }
}

 

//2. adopt tag Tag to get a single GameObject ：objCube=GameObject.FindWithTag("Finish");

//3. Get multiple groups of game objects through the game tag ：objCube=GameObject.FindGameObjectsWithTag("Finish");

8、 ... and ： add to 、 Get components

//1、 hold Move This script is added to cube On this game object 

cube.AddComponent("Move");

//2、 Add a rigid body to the game object 

cube.AddComponent("Rigidbody");

//3、 Add a sphere Collider to the game object 

cube.AddComponent("BoxCollider");



//1、 Get script components Move

Move m=cube.GetComponent<Move>();

//2、 Get the rigid body component 

Rigidbody r=cube.GetComponent<Rigidbody>();

Nine ：Random

float a=Random.value;                // return 0.0（ Include ） To 1.0（ Include ） Number between .
int b=Random.Range(0,100) ;         // Include the smallest but not the largest 

float c=Random.Range(0.0f,5.5f);    // Including maximum and minimum 

 

Ten ：Input

1. Mouse events

GetMouseButton(0): Press the left mouse button and don't move , The program will run all the time , Release the left key to stop the program .

GetMouseButton(2): Press the middle mouse button and don't move , The program will run all the time , Release the middle key to stop the program .

GetMouseButton(1): Press the right mouse button and don't move , The program will run all the time , Release the right button to stop the program .

GetMouseButtonDown(0): When you press the left mouse button , The program runs once

GetMouseButtonDown(1): When you press the right mouse button , The program runs once

GetMouseButtonUp(2): When you press the middle mouse button , The program does not run , When you release the middle key , The program runs once .

if(Input.GetMouseButton(0)){

   Execute statement ;

}

        2. Keyboard events

GetKey     When the key specified by name is pressed and held by the user, it returns true

GetKeyDown   When the user presses the key with the specified name, the frame returns true.

GetKeyUp    Returns... At the frame where the user releases the key with a given name true.

GetAxis（"Horizontal"） and GetAxis（"Vertical"）     Horizontal and vertical axes

if(Input.GetKey("Down")){

   Execute statement ;

}

// Case study ： Use the arrow keys or WASD To simulate the movement of objects 
    float speed = 3f;
	
	void Update () {
		//float h = Time.deltaTime * speed;
		// Press down WSAD Key to move the game object back and forth, left and right 
		/*if (Input.GetKey(KeyCode.A))
		{
			transform.Translate(new Vector3(-h, 0, 0));
		}
		if (Input.GetKey(KeyCode.D))
		{
			transform.Translate(new Vector3(h, 0, 0));
		}
		if (Input.GetKey(KeyCode.W))
		{
			transform.Translate(new Vector3(0, 0, h));
		}
		if (Input.GetKey(KeyCode.S))
		{
			transform.Translate(new Vector3(0, 0, -h));
		}*/
		//Horizontal
		//Vertical
		float h= Input.GetAxis("Horizontal")*Time.deltaTime*speed;
		float v = Input.GetAxis("Vertical") * Time.deltaTime * speed;
		//transform.Translate(h, 0, v);
		transform.Translate(new Vector3(h, 0, v));

	}

 

        3. Custom buttons

GetButton   Return... According to the button name true When the corresponding virtual button is pressed .

GetButtonDown  The frame in which the virtual button of a given name is pressed returns true.

GetButtonUp    Returns... When the user releases the virtual button with the specified name true.

// Case study ： Left click , Add a force to the object 
if (Input.GetButtonDown("Fire1"))
		{
			GameObject go = Instantiate(cube);
			Rigidbody r = go.GetComponent<Rigidbody>();// Get rigid body components from preset bodies 
			r.AddForce(0,0,10000);// Add force to the preset body 
	}

11、 ... and ： coroutines

Collaborative process , That is, when the main program is running, another logic processing is started at the same time to coordinate the execution of the current program . let me put it another way , To start a collaborative program is to start a thread .   

Use StartCoroutine（string methodName） You can start a thread .

Yield A statement is a special type of Return（ return ） sentence , It ensures that the next time the function is executed , Not from scratch , But from Yield Start at statement .

Synergetic process is actually a IEnumerator（ iterator ）. The iterator method runs to yield return When the sentence is , Will return an expression and keep the current position in the code . The next time the iterator function is called, execution restarts from that location .

// Case study ： every other 3 Second clone a cube 
public GameObject cube;
	void Start () {
		StartCoroutine("NewCube");
	}
	IEnumerator NewCube()
    {
        while (true)
        {
			Instantiate(cube);
			yield return new WaitForSeconds(3f);
		}
}

Part of the exercise ：

//2、 Click the left mouse button to clone a sphere bullet ,5 The bullet will be destroyed in seconds 
    public GameObject obj;
	GameObject g1;
    void Update () {

        if (Input .GetButtonDown("Fire1"))
        {
			g1=Instantiate(obj)as GameObject;
        }
		Destroy(g1,5);
	}
//2、 use yield Implement game objects 3 Second press X The axis moves in the positive direction 2 rice 
    public GameObject cube;
	
	void Start () {
		StartCoroutine(BB());
	}
	IEnumerator BB()
    {
        while (true)
        {
			yield return new WaitForSeconds(3f);
			Instantiate(cube, Vector3.right * Time.time * 2, Quaternion.identity);
        }
    }
//4、 use Time Class implementation 5 Second countdown （ Show... On the page ）
    public float a = 5f;
	void Start () {
       
	}
	void Update () {
		if (a >= 0)
		{
			print((int)a);
		}
		
		a -= Time.deltaTime;
	}
//5.	 Press up, down, left and right （WSAD） key , Let the game object move back and forth, left and right 
        float h = Input.GetAxis("Horizontal");
		float v = Input.GetAxis("Vertical");
		transform.Translate(h, 0, v);
//6、 use Random Class generates a four digit verification code （ No repetition ）
	void Start () {
		int a = Random.Range(0, 9);
		int b = Random.Range(0, 9);
		int c = Random.Range(0, 9);
		int d = Random.Range(0, 9);
        if (a!=b&&a!=c&&a!=d&&b!=c&&b !=d&&c !=d)
        {
			print(a+""+b+""+c+""+d);
        }
	}
//7、 Script Test Access script Test2 What's in it （ Find game objects by name ）
    public class Test : MonoBehaviour {
    
	    public float time = 3f;
    }
    public class Test2 : MonoBehaviour {

	    GameObject cube;
	    void Start() {
		    cube = GameObject.Find("Cube");
		    Test t = GetComponent<Test>();
		    print(t.time);
	    }
    }
//8、 Click the left mouse button to make the object move towards Z The axis moves in the positive direction 3 rice , Click the right mouse button to make the object circle Y Shaft rotation 
	void Update () {
        if (Input .GetButtonDown("Fire1"))
        {
			transform.Translate(Vector3.forward*Time.time*3);
        }
        else if (Input .GetButtonDown("Fire2"))
        {
			transform.Rotate(new Vector3(0, 1, 0));
        }
	}
//9、 Click the left mouse button to XZ Launch the ball diagonally 
    void Update () {
        if (Input.GetButtonDown("Fire1"))
        {
			GameObject g = Instantiate(sq);
			Rigidbody r = g.AddComponent<Rigidbody>();
			r.AddForce(1000, 0, 10000);
        }	
	}
//10、3 The second countdown enlarges the sphere 2 times , And then again 3 The second countdown makes the sphere the same 
 		time -= Time.deltaTime;
			if (time <= 3)
			{
				transform.localScale = new Vector3(2, 2, 2);
				if (time <= 0)
				{
					transform.localScale = new Vector3(1, 1, 1);
				}
			}
//11、 Brick wall ： Dynamic generation 10 That's ok 10 Columns of walls , Click the left mouse button to launch a sphere to the wall ,3 Seconds later, the sphere disappears 
public GameObject cube;
	public GameObject sq;
	// Use this for initialization
	void Start () {
        for (int i = 0; i < 10; i++)
        {
            for (int j = 0; j < 10; j++)
            {
				Instantiate(cube, new Vector3(i, j, 0), Quaternion.identity);
            }
        }
	}
	
	// Update is called once per frame
	void Update () {
        if (Input.GetButtonDown("Fire1"))
        {
			GameObject g = Instantiate(sq);
			Rigidbody r = g.AddComponent<Rigidbody>();
			r.AddForce(0,0,10000);
			Destroy(sq, 3);

        }
	}
 
//12、 Click the left mouse button to clone a bullet , Then let the bullet fly straight ahead 
        if (Input.GetButtonDown("Fire1"))
        {
			GameObject g = Instantiate(sq);
			Rigidbody r = g.AddComponent<Rigidbody>();
			r.AddForce(0, 0, 100000);
        }
//13. Game begins 3 Seconds later , Different positions in the game scene （x:0--10 z:2--8） Random simultaneous cloning 3 A game object 
     void Start()
     {
          StartCoroutine(AA());
     }
     IEnumerator AA()//15.
     {

        while (true)
        {

            yield return new WaitForSeconds(3f);
            for (int i = 0; i < 3; i++)
            {
                int x = Random.Range(0, 10);
                int z = Random.Range(2, 8);
                Instantiate(cube, new Vector3(x, 0, z), Quaternion.identity);
            }


        }
    }