// author: Marcus Xie
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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public class RotateToMouse : MonoBehaviour
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{
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public Camera cam;
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public float maximumLength;
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private Ray rayMouse;
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private Vector3 pos;
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private Vector3 direction;
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private Quaternion rotation;
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void Update()
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{
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if (cam != null)
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{
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// get the position where the mouse clicks ont the screen
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var mousePos = Input.mousePosition;
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// a ray from camera going towards the direction you clicked
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rayMouse = cam.ScreenPointToRay(mousePos);
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RaycastHit hit;
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// if the ray hit somewhere on a object, rotate the gun towards the hit point
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if (Physics.Raycast(rayMouse.origin, rayMouse.direction, out hit, maximumLength))
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RotateToMouseDirection(gameObject, hit.point);
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else
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{
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// if the ray fails to hit anywhere, it cannot keep going forever, give it a maximal length to stop
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var pos = rayMouse.GetPoint(maximumLength);
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RotateToMouseDirection(gameObject, pos);
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}
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}
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else
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Debug.Log("Camera is not assigned");
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}
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void RotateToMouseDirection(GameObject obj, Vector3 destination)
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{
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direction = destination - obj.transform.position;
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rotation = Quaternion.LookRotation(direction);
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obj.transform.localRotation = Quaternion.Lerp(obj.transform.rotation, rotation, 1);
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}
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}
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