Added Dart Physics

Scenes/camera_3d.gd

@@ -0,0 +1,27 @@
+extends Camera3D
+
+var held_dart: Dart = null
+
+func _unhandled_input(event):
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
+		if event.pressed:
+			try_grab_dart(event.position)
+		else:
+			if held_dart:
+				held_dart.release_drag()
+				held_dart = null
+	elif event is InputEventMouseMotion and held_dart:
+		held_dart.update_drag(self, event.position)
+
+func try_grab_dart(mouse_pos: Vector2):
+	var ray_origin = project_ray_origin(mouse_pos)
+	var ray_dir = project_ray_normal(mouse_pos)
+	var ray_end = ray_origin + ray_dir * 1000.0
+
+	var space_state = get_world_3d().direct_space_state
+	var query = PhysicsRayQueryParameters3D.create(ray_origin, ray_end)
+	var result = space_state.intersect_ray(query)
+
+	if result and result.collider is Dart:
+		held_dart = result.collider
+		held_dart.start_drag(self, mouse_pos, result.position)