Unity Camera Edge Collider

카메라의 사이즈에 딱 맞는 Edge Collider를 만들어주는 코드입니다. 카메라내에 오브젝트가 카메라 밖으로 나가면 안되는 경우 유용합니다. 

public class CameraEdgeCollider : MonoBehaviour
{
    private EdgeCollider2D ec;

    private void Awake()
    {
        ec = this.GetComponent<EdgeCollider2D>();

        if (ec == null)
        {
            ec = this.AddComponent<EdgeCollider2D>();
        }

        var camera = Camera.main;
        var lb = (Vector2)camera.ScreenToWorldPoint(new Vector3(0.0f, 0.0f, camera.nearClipPlane));
        var lt = (Vector2)camera.ScreenToWorldPoint(new Vector3(0.0f, camera.pixelHeight, camera.nearClipPlane));
        var rt = (Vector2)camera.ScreenToWorldPoint(new Vector3(camera.pixelWidth, camera.pixelHeight, camera.nearClipPlane));
        var rb = (Vector2)camera.ScreenToWorldPoint(new Vector3(camera.pixelWidth, 0.0f, camera.nearClipPlane));
        var edgePoints = new[] { lb, lt, rt, rb, lb };
        ec.points = edgePoints;
    }
}