unity3d：ugui世界坐标朝向摄像机

最新推荐文章于 2025-03-21 11:02:42 发布

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#unity3d #ugui #朝向摄像机

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本文介绍两个Unity脚本：LookAtCam和BEBillboard3D。LookAtCam使用插值使对象平滑转向摄像机方向。BEBillboard3D实现3D公告牌效果，对象始终面向摄像机，可通过选择位置或旋转方式定制。

using UnityEngine;
using System.Collections;

public class LookAtCam : MonoBehaviour {
    public Transform m_camTrans;
	// Use this for initialization
	void Start () {
	
	}
	
    void Update()
    {
        Vector3 relativePos = transform.position - m_camTrans.position;
        Quaternion lookAtRotation = Quaternion.LookRotation(relativePos, Vector3.up);
        this.transform.rotation = Quaternion.Lerp(this.transform.rotation, lookAtRotation,  Time.deltaTime);
    }
}

非插值

public class BEBillboard3D : MonoBehaviour {

		public bool UsePosition = false;
		Camera cam;
			
		void Start() {
			cam = Camera.main;
		}

		void Update() {

			if(UsePosition) {
				Vector3 vDir = cam.transform.position - transform.position;
				vDir.Normalize();
				transform.rotation = Quaternion.LookRotation(-vDir);
			}
			else {
				transform.rotation = cam.transform.rotation;
			}
		}
	}