Falling props

Scripts/Actors/3D/PropGravityModule3D.cs

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+using Godot;
+
+namespace Cirno.Scripts.Actors._3D;
+
+public partial class PropGravityModule3D : Node
+{
+    [Export] public float FallingSpeed { get; private set; } = 10f;
+
+    private StaticBody3D _parent;
+
+    private bool _isFalling = false;
+    private int _detectedBodies = 0;
+    public override void _Ready()
+    {
+        _parent = GetParent<StaticBody3D>();
+    }
+
+    public override void _PhysicsProcess(double delta)
+    {
+        if (!_isFalling) return;
+        _parent.GlobalPosition += new Vector3(0, FallingSpeed , 0) * (float)delta;
+    }
+
+    public void OnBodyEntered(Node3D body)
+    {
+        if (body == _parent) return;
+        _detectedBodies++;
+        TryFalling();
+    }
+
+    public void OnBodyExited(Node3D body)
+    {
+        if (body == _parent) return;
+        _detectedBodies--;
+        TryFalling();
+    }
+
+    private void TryFalling()
+    {
+        _isFalling = _detectedBodies == 0;
+    }
+}

Scripts/Actors/3D/PropGravityModule3D.cs.uid

@@ -0,0 +1 @@
+uid://hkmutmmjqh1e