hellbound/Assets/Sources/Feel/MMTools/Tools/MMCamera/MMBillboard.cs

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2021-11-26 11:16:25 +03:00
using UnityEngine;
using System.Collections;
namespace MoreMountains.Tools
{
/// <summary>
/// Add this class to an object (usually a sprite) and it'll face the camera at all times
/// </summary>
[AddComponentMenu("More Mountains/Tools/Camera/MMBillboard")]
public class MMBillboard : MonoBehaviour
{
/// the camera we're facing
public Camera MainCamera { get; set; }
/// whether or not this object should automatically grab a camera on start
public bool GrabMainCameraOnStart = true;
/// whether or not to nest this object below a parent container
public bool NestObject = true;
/// the Vector3 to offset the look at direction by
public Vector3 OffsetDirection = Vector3.back;
/// the Vector3 to consider as "world up"
public Vector3 Up = Vector3.up;
protected GameObject _parentContainer;
private Transform _transform;
/// <summary>
/// On awake we grab a camera if needed, and nest our object
/// </summary>
protected virtual void Awake()
{
_transform = transform;
if (GrabMainCameraOnStart == true)
{
GrabMainCamera ();
}
}
private void Start()
{
if (NestObject)
{
NestThisObject();
}
}
/// <summary>
/// Nests this object below a parent container
/// </summary>
protected virtual void NestThisObject()
{
_parentContainer = new GameObject();
_parentContainer.name = "Parent"+transform.gameObject.name;
_parentContainer.transform.position = transform.position;
transform.parent = _parentContainer.transform;
}
/// <summary>
/// Grabs the main camera.
/// </summary>
protected virtual void GrabMainCamera()
{
MainCamera = Camera.main;
}
/// <summary>
/// On update, we change our parent container's rotation to face the camera
/// </summary>
protected virtual void Update()
{
if (NestObject)
{
_parentContainer.transform.LookAt(_parentContainer.transform.position + MainCamera.transform.rotation * OffsetDirection, MainCamera.transform.rotation * Up);
}
else
{
_transform.LookAt(_transform.position + MainCamera.transform.rotation * OffsetDirection, MainCamera.transform.rotation * Up);
}
}
}
}