From 8ae3c23ec84da6f4dc69ff282569eda971056731 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Thu, 15 Jul 2021 22:07:25 +0200
Subject: [PATCH] Add `Actor.RotateAround`

---
 Source/Engine/Level/Actor.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Source/Engine/Level/Actor.cs b/Source/Engine/Level/Actor.cs
index 669945e7e..c3b13bece 100644
--- a/Source/Engine/Level/Actor.cs
+++ b/Source/Engine/Level/Actor.cs
@@ -317,6 +317,23 @@ namespace FlaxEngine
             }
         }
 
+        /// <summary>
+        /// Rotates the actor around axis passing through point in world-space by angle (in degrees).
+        /// </summary>
+        /// <remarks>Modifies both the position and the rotation of the actor (scale remains the same).</remarks>
+        /// <param name="point">The point (world-space).</param>
+        /// <param name="axis">The axis (normalized).</param>
+        /// <param name="angle">The angle (in degrees).</param>
+        public void RotateAround(Vector3 point, Vector3 axis, float angle)
+        {
+            var transform = Transform;
+            var q = Quaternion.RotationAxis(axis, angle * Mathf.DegreesToRadians);
+            var dif = (transform.Translation - point) * q;
+            transform.Translation = point + dif;
+            transform.Orientation = q;
+            Transform = transform;
+        }
+
         /// <inheritdoc />
         public override string ToString()
         {