Smaller optional features added to the Billboard component (lerping a…

…nd only rotating around the y axis)

CsCore/CsCoreUnity/Plugins/CsCoreUnity/com/csutil/ui/Components/3d/LookAtBillboard.cs

@@ -1,18 +1,30 @@
-using System;
 using UnityEngine;
+using UnityEngine.Serialization;
 
 namespace com.csutil {
 
     public class LookAtBillboard : MonoBehaviour {
 
         public Transform targetToLookAt;
+        public float lerpSpeed = 0;
+        public float lerpOmega = 20;
+        private Vector3 _lerpVelocity = Vector3.zero;
+        public bool onlyRotateAroundY = false;
 
         private void OnEnable() {
             if (targetToLookAt == null) { targetToLookAt = Camera.main.transform; }
         }
 
         private void Update() {
-            transform.forward = targetToLookAt.forward;
+            var newForward = targetToLookAt.forward;
+            if (onlyRotateAroundY) {
+                newForward = Vector3.Scale(newForward, new Vector3(1, 0, 1)).normalized;
+            }
+            if (lerpSpeed > 0) {
+                transform.forward = transform.forward.LerpWithVelocity(newForward, ref _lerpVelocity, Time.deltaTime * lerpSpeed, lerpOmega);
+            } else {
+                transform.forward = newForward;
+            }
         }
 
     }