1. The necessary conditions for an object to collide ？

Both objects must have colliders （Collider）, One of the objects must also have Rigidbody rigid body , And it must be a moving object with Rigidbody Script can detect collision .

        2.Unity3d The difference between Collider and trigger in ？

The method is different

Is Trigger  Check or not

Can penetrate and cannot penetrate

The collider is the carrier of the trigger , The trigger is just an attribute of the collider . When Is Trigger=false when , The collider triggers collisions based on the physics engine , Produce the effect of collision , You can call OnCollisionEnter/Stay/Exit function ; When Is Trigger=true when , Collider ignored by physics engine , No collision effect , You can call OnTriggerEnter/Stay/Exit function . If you want to detect the contact of an object and don't want collision detection to affect the movement of an object or whether an object passes through an area in space, you can use a trigger

        3. sketch prefab Usefulness ？

Presupposition ： Repeated use Instantiate when the game is running ,prefab It's like a template , For the material you already have 、 Script 、 Parameter to make a default configuration , For future modification , meanwhile prefab The packaged content simplifies the export operation , Facilitate team communication .

        4.Unity3d Scripts have a relatively complete life cycle from wake-up to destruction , Please list some of the system's own

Important methods ？

Awake——>OnEnable–>Start——>Update——>FixedUpdate——>LateUpdate——>OnGUI——>OnDisable——>OnDestroy

Space war needs

• Technical points
  1. Mathf class 、Transform class 、Time class 、GameObject class 、Vector3 class 、  Random class

1. Keyboard events
   1. particle system
   2. Audio
   3. UGUI
   4. collision detection        Saturday test
   5. coroutines
   6. The destruction
   7. clone
   8. Mouse events

• Star Management
  1. 1. use Quad Make
     2. With two Quad Splicing into
     3. The stars circle and roll
• Our aircraft Management
  1. 1. Control the movement through the keyboard
     2. Click the left mouse button to fire bullets
     3. There is a sound playing when the bullet is fired
     4. Jet effect at the tail of the plane
• Our bullet Management
  1. 1. Bullets fly
     2. Hit a meteorite or enemy aircraft to reduce the opponent's HP , Destroy yourself
     3. If you don't hit a meteorite or an enemy plane after cloning , Hit the edge Collider and destroy
• Enemy meteorite Management
  1. 1. Program started 3 Clone in seconds 3 individual , Then every 6 Second clone three more
     2. The meteorite rotates itself
     3. The bullets will be destroyed automatically when they encounter our prescription , Accompanied by explosion sound and explosion effects
• Enemy aircraft management
  1. 1. Program started 8 Clone in seconds 3 individual , Then every 8 Second clone three more
     2. every other 1 Fire a bullet in seconds
     3. When life is 0 Time to destroy , Accompanied by explosion sound and explosion effects
• Enemy bullet management
  1. 1. Bullets fly
     2. Hitting our aircraft will reduce the HP of our aircraft , Destroy yourself
     3. If you don't shoot our plane after cloning , Hit the edge Collider and destroy
• Points and health management
  1. 1. Points are increased by destroying meteorites and enemy aircraft
     2. Health decreases as the enemy shoots at us , The duty of 0 When the game is over

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BG : MonoBehaviour {

	public float speed;
	Vector3 startPos;
	void Start () {
		startPos = transform.position;
	}
	
	// Update is called once per frame
	void Update () {
		float pos = Mathf.Repeat(speed*Time .time ,30f);
		transform.position = startPos + Vector3.back * pos;
	}
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class playerShip : MonoBehaviour {
	public float speed;
	Rigidbody r;

	public float fx;// Offset 
	public float xMax, xMin, zMax, zMin;
	public GameObject bullet;// The bullet body 
	public Transform bulletpos;// Bullet firing position 
	public float shotSpace;// The interval between bullets （0.25）
	private float nextShot; // Next launch time 
    public GameObject playerEx;

	void Start () {
		r = GetComponent<Rigidbody>();
	}
	
	// Update is called once per frame
	void Update ()
    {
        move();
        Fire();

    }
    void Fire()
    {
        if (Input .GetButtonDown("Fire1")&&Time.time>nextShot)
        {
            nextShot = Time.time + shotSpace;
            // Bullet cloning 
            Instantiate(bullet, bulletpos.position,Quaternion.identity );//bulletpos.rotation
        }
    }

    private void move()
    {
        float h = Input.GetAxis("Horizontal") * speed;//*Time.deltaTime
        float v = Input.GetAxis("Vertical") * speed;
        Vector3 pos = new Vector3(h, 0, v);
        r.velocity = pos;
        // Aircraft rotation 
        r.rotation = Quaternion.Euler(0, 0, r.velocity.x * (-1) * fx);//-1   Indicates the correct direction 
                                                                      // Set boundaries 
        float x = Mathf.Clamp(r.position.x, xMin, xMax);
        float z = Mathf.Clamp(r.position.z, zMin, zMax);
        r.position = new Vector3(x, 0.3f, z);
    }
    void OnTriggerEnter(Collider other)
    {
        // Hit the bullet of the enemy plane , Enemy planes flying in and out , Meteorite 
        if (other.CompareTag("Enemy") || other.CompareTag("EnemyBullet")||other .CompareTag("EnemyShip"))
        {

            GM.instance.playerLife--;// Blood loss 

        }
        
    }
}

 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class GM : MonoBehaviour {

	public static GM instance;
	public GameObject[] yunShi;// Three different types of meteorite presets 
	public GameObject[] enemy;
	public int playerLife = 10;// Player health 
	public  int enemyLife = 5;
	public int score = 0;// fraction 

	public Text Hp;// Blood volume text 
	public Text ScoreTxt;// Score text 
	public GameObject GameOver;// Game ending screen 
	void Start()
    {
		instance = this;

		StartCoroutine("SpwanEnemy");
    }
	void Update()
    {
		Hp.text = playerLife.ToString();
		ScoreTxt.text = score.ToString();
        if (playerLife <=0)
        {
			GameOver.SetActive(true);// Show the end of the game 
			Time.timeScale = 0;// Game pause   
        }
    }
	IEnumerator SpwanEnemy()
    {
		yield return new WaitForSeconds(3f);// Game begins 3 Seconds later 
        while (true)
        {
			
            for (int i = 0; i < yunShi .Length; i++)
            {
				// The location and species of cloned meteorites are random 
				int r = Random.Range(0, yunShi.Length);
				float x = Random.Range(6.7f, -6.7f);
				float z = Random.Range(-18f,-10f);
				Instantiate(yunShi[r], new Vector3(x, 0.3f, z), Quaternion.identity);

            }
            for (int j = 0; j < enemy.Length; j++)
            {
				int f = Random.Range(0, enemy.Length);
				float xx = Random.Range(6.7f, -6.7f);
				float zz = Random.Range(-16f, -10f);
				Instantiate(enemy[f], new Vector3(xx, 0.3f, zz), Quaternion.Euler(0, 180, 0));
			}
				
			

            yield return new WaitForSeconds(3f);// After cloning 3 second 
		}
		
    }
}

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