【Unity3D】相机

using UnityEngine;
 
public class MainCameraController : MonoBehaviour {
	private Transform player; // 玩家
	private Vector3 relaPlayerPos; // 相机在玩家坐标系中的位置
	private float targetDistance = 15f; // 相机看向玩家前方的位置
 
	private void Start() {
		relaPlayerPos = new Vector3(0, 4, -8);
		player = GameObject.Find("Player/Top").transform;
	}
 
	private void LateUpdate() {
		CompCameraPos();
	}
 
	private void CompCameraPos() { // 计算相机坐标
		Vector3 target = player.position + player.forward * targetDistance;
		transform.position = transformVecter(relaPlayerPos, player.position, player.right, player.up, player.forward);
		transform.rotation = Quaternion.LookRotation(target - transform.position);
	}
 
	// 求以origin为原点, locX, locY, locZ 为坐标轴的本地坐标系中的向量 vec 在世界坐标系中对应的向量
	private Vector3 transformVecter(Vector3 vec, Vector3 origin, Vector3 locX,  Vector3 locY,  Vector3 locZ) {
		return vec.x * locX + vec.y * locY + vec.z * locZ + origin;
	}
}

using UnityEngine;
 
public class MinimapController : MonoBehaviour {
	private Transform player; // 玩家
	private float height = 12; // 相机离地面的高度
	private bool isFullscreen = false; // 小地图相机是否全屏
	private Rect minViewport; // 小地图视口位置和大小（相对值）
	private Rect FullViewport; // 全屏时视口位置和大小（相对值）
 
	private void Start() {
		player = GameObject.Find("Player/Top").transform;
		minViewport = GetComponent().rect;
		FullViewport = new Rect(0, 0, 1, 1);
	}
 
	private void Update() {
		if (Input.GetMouseButtonDown(0) && IsClickMinimap()) {
			if (isFullscreen) {
				GetComponent().rect = minViewport;
			} else {
				GetComponent().rect = FullViewport;
			}
			isFullscreen = !isFullscreen;
		}
	}
 
	private void LateUpdate() {
		Vector3 pos = player.position;
		transform.position = new Vector3(pos.x, height, pos.z);
	}
 
	public bool IsClickMinimap() { // 是否单击到小地图区域
		Vector3 pos = Input.mousePosition;
		if (isFullscreen) {
			return true;
		}
		if (pos.x / Screen.width > minViewport.xMin && pos.y / Screen.height > minViewport.yMin) {
			return true;
		}
		return false;
	}
}

using UnityEngine;
 
public class PlayerController : MonoBehaviour {
	private MinimapController minimapController; // 小地图控制器
	private Transform firePoint; // 开火点
	private GameObject bulletPrefab; // 炮弹预设体
	private float tankMoveSpeed = 4f; // 坦克移动速度
	private float tankRotateSpeed = 2f; // 坦克转向速度
	private Vector3 predownMousePoint; // 鼠标按下时的位置
	private Vector3 currMousePoint; // 当前鼠标位置
	private float fireWaitTime = float.MaxValue; // 距离上次开火已等待的时间
	private float bulletCoolTime = 0.15f; // 炮弹冷却时间
 
 	private void Start() {
		minimapController = GameObject.Find("MinimapCamera").GetComponent();
		firePoint = transform.Find("Top/Gun/FirePoint");
		bulletPrefab = (GameObject) Resources.Load("Prefabs/Bullet");
	}
 
	private void Update() {
		Move();
		Rotate();
		Fire();
	}
 
	private void Move() { // 坦克移动
		float hor = Input.GetAxis("Horizontal");
        float ver = Input.GetAxis("Vertical");
		if (Mathf.Abs(hor) > float.Epsilon || Mathf.Abs(ver) > float.Epsilon) {
			Vector3 vec = transform.forward * ver + transform.right * hor;
			GetComponent().velocity = vec * tankMoveSpeed;
			Vector3 dire = new Vector3(hor, ver, 0);
			dire =  dire.normalized * Mathf.Min(dire.magnitude, 1);
		}
	}
 
	private void Rotate() { // 坦克旋转
		if (Input.GetMouseButtonDown(1)) {
			predownMousePoint = Input.mousePosition;
		} else if (Input.GetMouseButton(1)) {
			currMousePoint = Input.mousePosition;
			Vector3 vec = currMousePoint - predownMousePoint;
			GetComponent().angularVelocity = Vector3.up * tankRotateSpeed * vec.x;
			predownMousePoint = currMousePoint;
		}
	}
 
	private void Fire() { // 坦克开炮
		fireWaitTime += Time.deltaTime;
		if (Input.GetMouseButtonDown(0) && !minimapController.IsClickMinimap() || Input.GetKeyDown(KeyCode.Space)) {
			if (fireWaitTime > bulletCoolTime) {
				BulletInfo bulletInfo = new BulletInfo("PlayerBullet", Color.red, transform.forward, 10f, 15f);
				GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity);
				bullet.AddComponent().SetBulletInfo(bulletInfo);
				fireWaitTime = 0f;
			}
		}
	}
}

using UnityEngine;
using UnityEngine.UI;
 
public class BulletController : MonoBehaviour {
	private BulletInfo bulletInfo; // 炮弹信息
 
	private void Start () {
		gameObject.name = bulletInfo.name;
		GetComponent().material.color = bulletInfo.color;
		float lifeTime = bulletInfo.fireRange / bulletInfo.speed; // 存活时间
		Destroy(gameObject, lifeTime);
	}
 
	private void Update () {
		transform.GetComponent().velocity = bulletInfo.flyDir * bulletInfo.speed;
	}
 
	public void SetBulletInfo(BulletInfo bulletInfo) {
		this.bulletInfo = bulletInfo;
	}
}

using UnityEngine;
 
public class BulletInfo {
	public string name; // 炮弹名
	public Color color; // 炮弹颜色
	public Vector3 flyDir; // 炮弹飞出方向
	public float speed; // 炮弹飞行速度
	public float fireRange; // 炮弹射程
 
	public BulletInfo(string name, Color color, Vector3 flyDir, float speed, float fireRange) {
		this.name = name;
		this.color = color;
		this.flyDir = flyDir;
		this.speed = speed;
		this.fireRange = fireRange;
	}
}