wip - fixing movement physics

src/components/PlayerPhysicsController.cs

@@ -23,6 +23,8 @@ public partial class PlayerPhysicsController : CharacterBody2D {
 
     [Export]
     public float DragCoefficient { get; set; } = 1.3f;
+    [Export]
+    public float FloatingDragCoefficientMultiplier { get; set; } = 0.8f;
 
     [Export]
     public Label DebugTextLabel { get; set; }
@@ -35,6 +37,8 @@ public partial class PlayerPhysicsController : CharacterBody2D {
 
     private float TilesToMeters => 9.81f / Gravity;
 
+    private float PxToMeters => (1 / UnitToPx) * TilesToMeters;
+
     [Export]
     public float UnitToPx { get; set; } = 32;
 
@@ -49,17 +53,20 @@ public partial class PlayerPhysicsController : CharacterBody2D {
         _lv = Mathf.Sqrt(Mathf.Pow(Gravity * PeakTime / 2, 2) + 2 * Gravity * JumpHeight);
     }
 
-    private float CalculateRunDrag(float delta) {
-        return 
+    private float CalculateDrag(float velocity, float delta) {
+        var minopposing = Mathf.Abs(velocity * 0.99f);
+        return Mathf.Clamp(
             0.5f * 
-            DragCoefficient * 
+            (this.IsOnFloor() ? DragCoefficient : DragCoefficient * FloatingDragCoefficientMultiplier) * 
             (Mathf.Pow(TilesToMeters, 3) * AirDensity) * 
             (Mathf.Pow(TilesToMeters, 2) * DragArea) * 
-            Mathf.Pow(Velocity.X * TilesToMeters, 2) * 
+            Mathf.Pow(velocity * PxToMeters, 2) * 
             _invmass * 
-            -Mathf.Sign(Velocity.X) *
+            -Mathf.Sign(velocity) *
             delta *
-            (1f / TilesToMeters);
+            (1f / TilesToMeters),
+            -minopposing,
+            minopposing);
     }
 
     public override void _Ready() {
@@ -98,11 +105,10 @@ public partial class PlayerPhysicsController : CharacterBody2D {
         var lastCollision = this.IsOnCeiling();
         RecalculateLv();
 
-        float maxOpposingVel = -(Velocity.X * 0.99f / UnitToPx);
-        float velx = (Velocity.X / UnitToPx) + Mathf.Clamp(CalculateRunDrag((float)delta), Math.Min(maxOpposingVel, -maxOpposingVel), Math.Max(maxOpposingVel, -maxOpposingVel));
-        float vely = (Velocity.Y / UnitToPx) + Gravity * (float)delta;
+        float velx = (Velocity.X / UnitToPx) + CalculateDrag(Velocity.X, (float)delta);
+        float vely = (Velocity.Y / UnitToPx) + Gravity * (float)delta + CalculateDrag(Velocity.Y, (float)delta);
 
-        if (Mathf.Abs(velx) < 0.5) velx = 0;
+        if (Mathf.Abs(velx) < 0.3) velx = 0;
 
         var grounded = this.IsOnFloor();
         var coyoteGrounded = _timeOffGround < CoyoteTiming;
@@ -140,7 +146,7 @@ public partial class PlayerPhysicsController : CharacterBody2D {
             $"vely: {vely}\n" +
             $"velx: {velx}\n" +
             $"lv  : {_lv:F2} or {_lv/(float)delta:F2}\n" +
-            $"rd  : {CalculateRunDrag((float)delta)}";
+            $"rd  : {CalculateDrag(Velocity.X, (float)delta):F2}, {CalculateDrag(Velocity.Y, (float)delta):F2}";
         // Force = new Vector2(0, forcey);
         Velocity = new Vector2(velx, vely) * UnitToPx;