Better movement momentum

Scenes/Actors/IsoPlayer_FSM.tscn

@@ -288,7 +288,7 @@ Acceleration = 150.0
 Deceleration = 20.0
 Gravity = -20.0
 FallSpeed = 4.0
-TurnSpeed = 1.0
+TurnResistance = 0.8000000000029104
 
 [node name="Storage" type="Node" parent="." node_paths=PackedStringArray("Root", "Shield")]
 script = ExtResource("6_habpy")

Scripts/Components/FSM/3DPlayer/IsoMovementModule.cs

@@ -8,18 +8,20 @@ namespace Cirno.Scripts.Components.FSM._3DPlayer;
 
 public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D>
 {
-    [Export] public IsoPlayerStorageModule  PlayerStorage { get; private set; } 
+    [Export] public IsoPlayerStorageModule PlayerStorage { get; private set; }
     [Export] private InputProvider _inputProvider;
-    
+
     [Export] public PlayerHitboxSpriteProvider3D HitboxSpriteProvider { get; private set; }
-    
+
     [Export] public int Speed { get; set; } = 45;
     [Export] public int StrafeSpeed { get; set; } = 35;
     [Export] public float Acceleration = 8f;
     [Export] public float Deceleration = 8f;
     [Export] public float Gravity = -9.8f;
     [Export] public float FallSpeed = 20f;
-    
+
+    [Export] public float TurnResistance { get; set; } = 0.5f;
+
     private bool _isStrafing;
     private float _accelerationPerSecond;
     private float _decelerationPerSecond;
@@ -28,7 +30,7 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
 
     private IStateMachine<PlayerState, CharacterBody3D> _stateMachine;
     private CharacterBody3D MainObject => _stateMachine.MainObject;
-    
+
     public override void EnterState(PlayerState state)
     {
         _accelerationPerSecond = Speed / Acceleration;
@@ -37,7 +39,6 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
 
     public override void ExitState(PlayerState state)
     {
-        
     }
 
     public override void Init(IStateMachine<PlayerState, CharacterBody3D> machine)
@@ -48,10 +49,10 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
     public override void Process(double delta)
     {
         var movementInput = _inputProvider.GetMovementInput();
-        
+
         _isStrafing = _inputProvider.GetStrafePressed();
         var rightStickInput = _inputProvider.GetAimInput().Normalized();
-        
+
         // Update Facing Direction
         // if (!_isStrafing)
         // {
@@ -68,7 +69,7 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
         // }
 
         var rotatedMovementDirection = movementInput.Rotated(Mathf.DegToRad(-45f));
-        
+
         //PlayerStorage.MovementDirection = new Vector3(rotatedMovementDirection.X, 0, rotatedMovementDirection.Y);
         PlayerStorage.MovementDirection = rotatedMovementDirection;
 
@@ -78,12 +79,42 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
     private Vector2 InterpolateVelocityAxes(
         Vector2 current, Vector2 target, float accel, float decel, float delta)
     {
-        // Accelerate when we're increasing magnitude toward target on that axis; otherwise decelerate.
+        float newX = current.X;
-        float stepX = (Mathf.Abs(target.X) > Mathf.Abs(current.X)) ? accel : decel;
+        float newY = current.Y;
-        float stepY = (Mathf.Abs(target.Y) > Mathf.Abs(current.Y)) ? accel : decel;
+
+        // --- X Axis ---
+        if (Mathf.Sign(target.X) == Mathf.Sign(current.X) || Mathf.IsZeroApprox(current.X))
+        {
+            // Same direction or stopped → normal accel/decel
+            float step = (Mathf.Abs(target.X) > Mathf.Abs(current.X)) ? accel : decel;
+            newX = Mathf.MoveToward(current.X, target.X, step * delta);
+        }
+        else
+        {
+            // Opposite direction → apply resistance multiplier to deceleration
+            float slowStep = decel * TurnResistance;
+            newX = Mathf.MoveToward(current.X, 0, slowStep * delta);
+
+            // Only start accelerating toward target if we've nearly stopped
+            if (Mathf.IsZeroApprox(newX))
+                newX = Mathf.MoveToward(newX, target.X, accel * delta);
+        }
+
+        // --- Y Axis ---
+        if (Mathf.Sign(target.Y) == Mathf.Sign(current.Y) || Mathf.IsZeroApprox(current.Y))
+        {
+            float step = (Mathf.Abs(target.Y) > Mathf.Abs(current.Y)) ? accel : decel;
+            newY = Mathf.MoveToward(current.Y, target.Y, step * delta);
+        }
+        else
+        {
+            float slowStep = decel * TurnResistance;
+            newY = Mathf.MoveToward(current.Y, 0, slowStep * delta);
+
+            if (Mathf.IsZeroApprox(newY))
+                newY = Mathf.MoveToward(newY, target.Y, accel * delta);
+        }
 
-        float newX = Mathf.MoveToward(current.X, target.X, stepX * delta);
-        float newY = Mathf.MoveToward(current.Y, target.Y, stepY * delta);
         return new Vector2(newX, newY);
     }
 
@@ -93,29 +124,20 @@ public partial class IsoMovementModule : ModuleBase<PlayerState, CharacterBody3D
         Vector2 v = v3.ToVector2();
         float dt = (float)delta;
 
-        // Read desired input direction for this physics tick
         Vector2 inputDir = PlayerStorage.MovementDirection;
-
+        if (inputDir.Length() > 1f)
-        // Clamp diagonal magnitude so diagonals aren't faster (helps remove jittery speed jumps)
+            inputDir = inputDir.Normalized();
-        float len = inputDir.Length();
-        if (len > 1f)
-            inputDir /= len;
 
         if (_isStrafing)
         {
-            // Strafing stays instant/responsive if you want that behavior
             v = inputDir * StrafeSpeed;
         }
         else
         {
-            // Build a target *velocity* (not just direction)
             Vector2 targetVel = inputDir * Speed;
-
-            // Per-axis interpolation prevents direction snaps when keys change
             v = InterpolateVelocityAxes(v, targetVel, Acceleration, Deceleration, dt);
         }
 
-        // Y (gravity)
         float vy = Mathf.Clamp(v3.Y + Gravity * dt, -FallSpeed, FallSpeed);
         if (Input.IsKeyLabelPressed(Key.Z)) vy = 10;