通过移动相机位置使观察对象与鼠标对齐

MoveCameraAlignMouse.cs

using UnityEngine;
/// <summary>
/// 通过移动相机位置使观察对象与鼠标对齐
/// </summary>
public class MoveCameraAlignMouse:MonoBehaviour{
	//观察对象的Transform
	public Transform objTransform;
	//主相机
	private Camera cam;
	//观察对象与相机的z轴距离
	private float dz;

	private void Start(){
		cam=Camera.main;
		//计算观察对象与相机的z轴距离
		Vector3 objWorldPos=objTransform.position;
		dz=objWorldPos.z-cam.transform.position.z;
	}

	private void Update(){
		if(Input.GetMouseButton(0)){
			//相机绕观察对象旋转任意角度
			cam.transform.RotateAround(objTransform.position,new Vector3(Random.value,Random.value,Random.value),10);
			//观察对象的位置
			Vector3 objWorldPos=objTransform.position;
			//计算鼠标位置的世界坐标(将通过移动相机位置使观察对象与鼠标对齐)
			Vector2 targetScreenPos=Input.mousePosition;
			Vector3 targetWorldPos=cam.ScreenToWorldPoint(new Vector3(targetScreenPos.x,targetScreenPos.y,dz));
			//相机需要偏移的向量
			Vector3 offsetWorld=objWorldPos-targetWorldPos;
			cam.transform.Translate(offsetWorld,Space.World);
		}
	}

}