feature: NetworkTransform interpolation can be disabled (#3378)

* Interpolation off bools for NetworkTransform.

Gives a snap-like effect to position, rotation and scaling.

* Update Assets/Mirror/Components/NetworkTransformBase.cs

* Update NetworkTransformBase.cs

---------

Co-authored-by: mischa <16416509+vis2k@users.noreply.github.com>

Assets/Mirror/Components/NetworkTransformBase.cs

@@ -42,11 +42,21 @@ public abstract class NetworkTransformBase : NetworkBehaviour
         public readonly SortedList<double, TransformSnapshot> serverSnapshots = new SortedList<double, TransformSnapshot>();
 
         // selective sync //////////////////////////////////////////////////////
-        [Header("Selective Sync & Interpolation\nDon't change these at Runtime")]
+        [Header("Selective Sync\nDon't change these at Runtime")]
         public bool syncPosition = true;  // do not change at runtime!
         public bool syncRotation = true;  // do not change at runtime!
         public bool syncScale    = false; // do not change at runtime! rare. off by default.
 
+        // interpolation is on by default, but can be disabled to jump to
+        // the destination immediately. some projects need this.
+        [Header("Interpolation")]
+        [Tooltip("Set to false to have a snap-like effect on position movement.")]
+        public bool interpolatePosition = true;
+        [Tooltip("Set to false to have a snap-like effect on rotations.")]
+        public bool interpolateRotation = true;
+        [Tooltip("Set to false to remove scale smoothing. Example use-case: Instant flipping of sprites that use -X and +X for direction.")]
+        public bool interpolateScale = true;
+
         // debugging ///////////////////////////////////////////////////////////
         [Header("Debug")]
         public bool showGizmos;
@@ -141,7 +151,7 @@ protected void AddSnapshot(SortedList<double, TransformSnapshot> snapshots, doub
         //
         // NOTE: stuck detection is unnecessary here.
         //       we always set transform.position anyway, we can't get stuck.
-        protected virtual void Apply(TransformSnapshot interpolated)
+        protected virtual void Apply(TransformSnapshot interpolated, TransformSnapshot endGoal)
         {
             // local position/rotation for VR support
             //
@@ -150,9 +160,15 @@ protected virtual void Apply(TransformSnapshot interpolated)
             // -> we still interpolated
             // -> but simply don't apply it. if the user doesn't want to sync
             //    scale, then we should not touch scale etc.
-            if (syncPosition) target.localPosition = interpolated.position;
+
-            if (syncRotation) target.localRotation = interpolated.rotation;
+            if (syncPosition)
-            if (syncScale)    target.localScale = interpolated.scale;
+                target.localPosition = interpolatePosition ? interpolated.position : endGoal.position;
+
+            if (syncRotation)
+                target.localRotation = interpolateRotation ? interpolated.rotation : endGoal.rotation;
+
+            if (syncScale)
+                target.localScale = interpolateScale ? interpolated.scale : endGoal.scale;
         }
 
         // client->server teleport to force position without interpolation.

Assets/Mirror/Components/NetworkTransformReliable/NetworkTransformReliable.cs

@@ -82,7 +82,7 @@ void UpdateServer()
 
                     // interpolate & apply
                     TransformSnapshot computed = TransformSnapshot.Interpolate(from, to, t);
-                    Apply(computed);
+                    Apply(computed, to);
                 }
             }
 
@@ -129,7 +129,7 @@ void UpdateClient()
 
                     // interpolate & apply
                     TransformSnapshot computed = TransformSnapshot.Interpolate(from, to, t);
-                    Apply(computed);
+                    Apply(computed, to);
 
                 }
 

Assets/Mirror/Components/NetworkTransformUnreliable/NetworkTransform.cs

@@ -144,7 +144,7 @@ void UpdateServer()
 
                     // interpolate & apply
                     TransformSnapshot computed = TransformSnapshot.Interpolate(from, to, t);
-                    Apply(computed);
+                    Apply(computed, to);
                 }
             }
         }
@@ -235,7 +235,7 @@ void UpdateClient()
 
                     // interpolate & apply
                     TransformSnapshot computed = TransformSnapshot.Interpolate(from, to, t);
-                    Apply(computed);
+                    Apply(computed, to);
                 }
             }
         }

Assets/Mirror/Tests/Editor/NetworkTransform2kTests.cs

@@ -11,7 +11,7 @@ public class NetworkTransformExposed : NetworkTransform
     {
         public new TransformSnapshot Construct() => base.Construct();
         public new void Apply(TransformSnapshot interpolated) =>
-            base.Apply(interpolated);
+            base.Apply(interpolated, interpolated);
         public new void OnClientToServerSync(Vector3? position, Quaternion? rotation, Vector3? scale) =>
             base.OnClientToServerSync(position, rotation, scale);
         public new void OnServerToClientSync(Vector3? position, Quaternion? rotation, Vector3? scale) =>