Core/Movement: Corrected Animation Tier handling

Port From (https://github.com/TrinityCore/TrinityCore/commit/ee620856ad2918ae7ce91a37a980d9f2129a074a)

Source/Game/AI/SmartScripts/SmartScript.cs

@@ -1841,9 +1841,7 @@ namespace Game.AI
                                     target.ToUnit().AddVisFlags((UnitVisFlags)e.Action.setunitByte.byte1);
                                     break;
                                 case 3:
-                                    // this is totally wrong to maintain compatibility with existing scripts
-                                    // TODO: fix with animtier overhaul
-                                    target.ToUnit().SetAnimTier((UnitBytes1Flags)(target.ToUnit().m_unitData.AnimTier | e.Action.setunitByte.byte1), false);
+                                    target.ToUnit().SetAnimTier((AnimTier)e.Action.setunitByte.byte1);
                                     break;
                             }
                         }
@@ -1868,7 +1866,7 @@ namespace Game.AI
                                     target.ToUnit().RemoveVisFlags((UnitVisFlags)e.Action.setunitByte.byte1);
                                     break;
                                 case 3:
-                                    target.ToUnit().SetAnimTier((UnitBytes1Flags)(target.ToUnit().m_unitData.AnimTier & ~e.Action.setunitByte.byte1), false);
+                                    target.ToUnit().SetAnimTier(AnimTier.Ground);
                                     break;
                             }
                         }

Source/Game/Entities/Creature/Creature.cs

@@ -1807,6 +1807,7 @@ namespace Game.Entities
                 uint scalingMode = WorldConfig.GetUIntValue(WorldCfg.RespawnDynamicMode);
                 if (scalingMode != 0)
                     GetMap().ApplyDynamicModeRespawnScaling(this, m_spawnId, ref respawnDelay, scalingMode);
+
                 // @todo remove the boss respawn time hack in a dynspawn follow-up once we have creature groups in instances
                 if (m_respawnCompatibilityMode)
                 {
@@ -1841,8 +1842,9 @@ namespace Game.Entities
                 if (m_formation != null && m_formation.GetLeader() == this)
                     m_formation.FormationReset(true);
 
-                bool needsFalling = IsFlying() || IsHovering();
-                SetHover(false);
+                bool needsFalling = (IsFlying() || IsHovering()) && !IsUnderWater();
+                SetHover(false, false);
+                SetDisableGravity(false, false);
 
                 if (needsFalling)
                     GetMotionMaster().MoveFall();
@@ -2374,7 +2376,7 @@ namespace Game.Entities
 
                 SetStandState((UnitStandStateType)(cainfo.bytes1 & 0xFF));
                 SetVisFlags((UnitVisFlags)((cainfo.bytes1 >> 16) & 0xFF));
-                SetAnimTier((UnitBytes1Flags)((cainfo.bytes1 >> 24) & 0xFF), false);
+                SetAnimTier((AnimTier)((cainfo.bytes1 >> 24) & 0xFF), false);
 
                 //! Suspected correlation between UNIT_FIELD_BYTES_1, offset 3, value 0x2:
                 //! If no inhabittype_fly (if no MovementFlag_DisableGravity or MovementFlag_CanFly flag found in sniffs)

Source/Game/Entities/Player/Player.cs

@@ -4149,9 +4149,6 @@ namespace Game.Entities
 
             StopMirrorTimers();                                     //disable timers(bars)
 
-            // set and clear other
-            SetAnimTier(UnitBytes1Flags.AlwaysStand, false);
-
             // OnPlayerRepop hook
             Global.ScriptMgr.OnPlayerRepop(this);
         }
@@ -4358,7 +4355,6 @@ namespace Game.Entities
             // speed change, land walk
 
             // remove death flag + set aura
-            SetAnimTier(UnitBytes1Flags.None, false);
             RemovePlayerFlag(PlayerFlags.IsOutOfBounds);
 
             // This must be called always even on Players with race != RACE_NIGHTELF in case of faction change

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -659,7 +659,7 @@ namespace Game.Entities
             return IsInDist(obj, objBoundaryRadius);
         }
 
-        public bool SetDisableGravity(bool disable)
+        public bool SetDisableGravity(bool disable, bool updateAnimationTier = true)
         {
             if (disable == IsGravityDisabled())
                 return false;
@@ -692,6 +692,16 @@ namespace Game.Entities
                 SendMessageToSet(packet, true);
             }
 
+            if (IsCreature() && updateAnimationTier && IsAlive() && !HasUnitState(UnitState.Root) && !ToCreature().GetMovementTemplate().IsRooted())
+            {
+                if (IsGravityDisabled())
+                    SetAnimTier(AnimTier.Fly);
+                else if (IsHovering())
+                    SetAnimTier(AnimTier.Hover);
+                else
+                    SetAnimTier(AnimTier.Ground);
+            }
+
             return true;
         }
 
@@ -1011,7 +1021,7 @@ namespace Game.Entities
             return true;
         }
 
-        public bool SetHover(bool enable)
+        public bool SetHover(bool enable, bool updateAnimationTier = true)
         {
             if (enable == HasUnitMovementFlag(MovementFlag.Hover))
                 return false;
@@ -1056,6 +1066,17 @@ namespace Game.Entities
                 packet.MoverGUID = GetGUID();
                 SendMessageToSet(packet, true);
             }
+
+            if (IsCreature() && updateAnimationTier && IsAlive() && !HasUnitState(UnitState.Root) && !ToCreature().GetMovementTemplate().IsRooted())
+            {
+                if (IsGravityDisabled())
+                    SetAnimTier(AnimTier.Fly);
+                else if (IsHovering())
+                    SetAnimTier(AnimTier.Hover);
+                else
+                    SetAnimTier(AnimTier.Ground);
+            }
+
             return true;
         }
 
@@ -1723,10 +1744,17 @@ namespace Game.Entities
             }
 
             if (arrived)
+            {
                 DisableSpline();
 
+                AnimTier? animTier = MoveSpline.GetAnimation();
+                if (animTier.HasValue)
+                    SetAnimTier(animTier.Value);
+            }
+            
             UpdateSplinePosition();
         }
+
         void UpdateSplinePosition()
         {
             Vector4 loc = MoveSpline.ComputePosition();

Source/Game/Entities/Unit/Unit.cs

@@ -2154,7 +2154,9 @@ namespace Game.Entities
             }
         }
 
-        public void SetAnimTier(UnitBytes1Flags animTier, bool notifyClient)
+        public AnimTier GetAnimTier() { return (AnimTier)(byte)m_unitData.AnimTier; }
+        
+        public void SetAnimTier(AnimTier animTier, bool notifyClient = true)
         {
             SetUpdateFieldValue(m_values.ModifyValue(m_unitData).ModifyValue(m_unitData.AnimTier), (byte)animTier);
 

Source/Game/Movement/Generators/WaypointMovement.cs

@@ -358,10 +358,10 @@ namespace Game.Movement
             switch (waypoint.moveType)
             {
                 case WaypointMoveType.Land:
-                    init.SetAnimation(AnimType.ToGround);
+                    init.SetAnimation(AnimTier.Ground);
                     break;
                 case WaypointMoveType.Takeoff:
-                    init.SetAnimation(AnimType.ToFly);
+                    init.SetAnimation(AnimTier.Hover);
                     break;
                 case WaypointMoveType.Run:
                     init.SetWalk(false);

Source/Game/Movement/MotionMaster.cs

@@ -625,7 +625,7 @@ namespace Game.Movement
         {
             MoveSplineInit init = new(_owner);
             init.MoveTo(pos, false);
-            init.SetAnimation(AnimType.ToGround);
+            init.SetAnimation(AnimTier.Ground);
             Add(new GenericMovementGenerator(init, MovementGeneratorType.Effect, id));
         }
 
@@ -633,7 +633,7 @@ namespace Game.Movement
         {
             MoveSplineInit init = new(_owner);
             init.MoveTo(pos);
-            init.SetAnimation(AnimType.ToFly);
+            init.SetAnimation(AnimTier.Hover);
 
             Add(new GenericMovementGenerator(init, MovementGeneratorType.Effect, id));
         }
@@ -820,7 +820,7 @@ namespace Game.Movement
             {
                 init.SetFly();
                 init.SetCyclic();
-                init.SetAnimation(AnimType.ToFly);
+                init.SetAnimation(AnimTier.Hover);
             }
             else
             {

Source/Game/Movement/MoveSpline.cs

@@ -347,6 +347,8 @@ namespace Game.Movement
         public Vector3 FinalDestination() { return Initialized() ? spline.GetPoint(spline.Last()) : Vector3.Zero; }
         public Vector3 CurrentDestination() { return Initialized() ? spline.GetPoint(point_Idx + 1) : Vector3.Zero; }
 
+        public AnimTier? GetAnimation() { return anim_tier != null ? (AnimTier)anim_tier.AnimTier : null; }
+        
         #region Fields
         public MoveSplineInitArgs InitArgs;
         public Spline spline = new();

Source/Game/Movement/MoveSplineInit.cs

@@ -310,7 +310,7 @@ namespace Game.Movement
             args.flags.EnableParabolic();
         }
 
-        public void SetAnimation(AnimType anim)
+        public void SetAnimation(AnimTier anim)
         {
             args.time_perc = 0.0f;
             args.animTier = new();