Initial commit: VR Messs workspace (grab v5.3.1, body-physics research)

scripts/PhysicsSpike.cs

@@ -0,0 +1,56 @@
+using Godot;
+
+public partial class PhysicsSpike : Node3D
+{
+    private RigidBody3D _ball;
+    private RigidBody3D _chaser;
+    private Node3D _chaseTarget;
+    private float _elapsed;
+    private bool _ballTouched;
+
+    public override void _Ready()
+    {
+        StaticBody3D floor = new() { Position = new Vector3(0, -0.5f, 0) };
+        floor.AddChild(new CollisionShape3D { Shape = new BoxShape3D { Size = new Vector3(20, 1, 20) } });
+        AddChild(floor);
+
+        _ball = new RigidBody3D { Position = new Vector3(0, 2, 0), ContactMonitor = true, MaxContactsReported = 4 };
+        _ball.AddChild(new CollisionShape3D { Shape = new SphereShape3D { Radius = 0.25f } });
+        _ball.BodyEntered += _ => _ballTouched = true;
+        AddChild(_ball);
+
+        StaticBody3D wall = new() { Position = new Vector3(5, 2, 0) };
+        wall.AddChild(new CollisionShape3D { Shape = new BoxShape3D { Size = new Vector3(0.5f, 4, 4) } });
+        AddChild(wall);
+
+        _chaser = new RigidBody3D { Position = new Vector3(0, 1, 0), GravityScale = 0f };
+        _chaser.AddChild(new CollisionShape3D { Shape = new SphereShape3D { Radius = 0.25f } });
+        AddChild(_chaser);
+
+        _chaseTarget = new Node3D();
+        AddChild(_chaseTarget);
+        GD.Print("SPIKE: physics spike scene ready");
+    }
+
+    public override void _PhysicsProcess(double delta)
+    {
+        _elapsed += (float)delta;
+
+        _chaseTarget.GlobalPosition = new Vector3(Mathf.Min(8f, _elapsed * 2f), 1, 0);
+        Vector3 to = _chaseTarget.GlobalPosition - _chaser.GlobalPosition;
+        Vector3 desired = to / (float)delta;
+        if (desired.Length() > 3f)
+            desired = desired.Normalized() * 3f;
+        _chaser.LinearVelocity = desired;
+
+        if (_elapsed < 2.5f)
+            return;
+
+        bool dropOk = _ballTouched && _ball.GlobalPosition.Y > 0.2f && _ball.GlobalPosition.Y < 0.35f;
+        bool chaseOk = _chaser.GlobalPosition.X > 4.4f && _chaser.GlobalPosition.X < 5.05f;
+        GD.Print($"SPIKE: drop test — ball y={_ball.GlobalPosition.Y:F3} (expected ~0.25), contact={_ballTouched} → {(dropOk ? "PASS" : "FAIL")}");
+        GD.Print($"SPIKE: chase test — chaser x={_chaser.GlobalPosition.X:F3} (wall face 4.75, body radius 0.25), vel={_chaser.LinearVelocity.Length():F2} → {(chaseOk ? "PASS" : "FAIL")}");
+        GD.Print($"SPIKE: overall {(dropOk && chaseOk ? "PASS — Box3D functional from C#" : "CHECK — behavior differs, inspect above")}");
+        GetTree().Quit();
+    }
+}