82 lines
2.4 KiB
C#
82 lines
2.4 KiB
C#
using UnityEngine;
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using System.Collections;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// Add this class to an object (usually a sprite) and it'll face the camera at all times
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/// </summary>
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[AddComponentMenu("More Mountains/Tools/Camera/MMBillboard")]
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public class MMBillboard : MonoBehaviour
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{
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/// the camera we're facing
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public Camera MainCamera { get; set; }
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/// whether or not this object should automatically grab a camera on start
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public bool GrabMainCameraOnStart = true;
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/// whether or not to nest this object below a parent container
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public bool NestObject = true;
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/// the Vector3 to offset the look at direction by
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public Vector3 OffsetDirection = Vector3.back;
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/// the Vector3 to consider as "world up"
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public Vector3 Up = Vector3.up;
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protected GameObject _parentContainer;
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private Transform _transform;
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/// <summary>
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/// On awake we grab a camera if needed, and nest our object
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/// </summary>
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protected virtual void Awake()
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{
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_transform = transform;
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if (GrabMainCameraOnStart == true)
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{
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GrabMainCamera ();
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}
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}
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private void Start()
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{
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if (NestObject)
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{
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NestThisObject();
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}
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}
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/// <summary>
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/// Nests this object below a parent container
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/// </summary>
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protected virtual void NestThisObject()
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{
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_parentContainer = new GameObject();
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_parentContainer.name = "Parent"+transform.gameObject.name;
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_parentContainer.transform.position = transform.position;
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transform.parent = _parentContainer.transform;
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}
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/// <summary>
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/// Grabs the main camera.
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/// </summary>
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protected virtual void GrabMainCamera()
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{
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MainCamera = Camera.main;
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}
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/// <summary>
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/// On update, we change our parent container's rotation to face the camera
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/// </summary>
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protected virtual void Update()
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{
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if (NestObject)
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{
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_parentContainer.transform.LookAt(_parentContainer.transform.position + MainCamera.transform.rotation * OffsetDirection, MainCamera.transform.rotation * Up);
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}
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else
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{
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_transform.LookAt(_transform.position + MainCamera.transform.rotation * OffsetDirection, MainCamera.transform.rotation * Up);
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}
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}
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}
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}
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