分享一个Unity3D点击模型跟随鼠标移动的小脚本（包括屏幕视图到三维空间的坐标转换）

分享一个Unity3D点击模型跟随鼠标移动的小脚本，希望对需要的人有帮助！

直接把这个代码放在要移动的模型上就OVER了！！！

</pre><pre name="code" class="csharp">using UnityEngine;
using System.Collections;

public class ModelsPosChange : MonoBehaviour {
RaycastHit hit;
private Transform Icon;
bool isMove = false;
void Start () {
}

void FixedUpdate() {
if (isMove) {
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if ((Physics.Raycast(ray, out hit,500)) && (null != hit.collider)) {
Debug.DrawLine(ray.origin, hit.point);
Icon = transform.GetComponent<Transform>();
Vector3 screenPos = Camera.main.WorldToScreenPoint(Icon.position);
Vector3 offset = Icon.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPos.z));
Vector3 mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPos.z);
Vector3 worldPos = Camera.main.ScreenToWorldPoint(mousePos);
Icon.position = worldPos;
}
transform.renderer.material.color = Color.green;
if (Input.GetKey(KeyCode.Delete)) {
Destroy(this.gameObject);
}

} else {
transform.renderer.material.color = Color.white;
}
}
void OnMouseDown() {
isMove = !isMove;
}
}