Added Dart Physics

Scenes/DartPhysics.gd

@@ -0,0 +1,93 @@
+extends RigidBody3D
+
+class_name Dart
+
+
+
+var dragging: bool = false
+var drag_plane: Plane
+var drag_offset: Vector3 = Vector3.ZERO
+var target_pos: Vector3 = Vector3.ZERO
+
+# velocity tracking for release throw
+var position_history: Array[Vector3] = []
+var time_history: Array[float] = []
+const HISTORY_LENGTH = 5
+
+# drag "stiffness" tuning
+@export var drag_follow_speed: float = 20.0   # how fast it chases the mouse
+@export var max_drag_speed: float = 15.0      # clamp so it doesn't go insane
+@export_range(-180,180) var angle_of_plane: float = 15.0
+
+func start_drag(camera: Camera3D, mouse_pos: Vector2, hit_point: Vector3):
+	dragging = true
+
+	# keep it physics-active — don't freeze
+	gravity_scale = 0.0          # optional: ignore gravity while held so it doesn't sag
+	linear_damp = 4.0            # optional: a bit of damping for stability while dragged
+
+	#drag_plane = Plane(camera.global_transform.basis.z, hit_point)
+	var base_normal = camera.global_transform.basis.z
+	var tilt = base_normal.rotated(camera.global_transform.basis.x, deg_to_rad(angle_of_plane))  # tilt adjustable around camera's right axis
+	drag_plane = Plane(tilt.normalized(), hit_point)
+	drag_offset = global_position - hit_point
+
+	position_history.clear()
+	time_history.clear()
+
+func update_drag(camera: Camera3D, mouse_pos: Vector2):
+	if not dragging:
+		return
+
+	var ray_origin = camera.project_ray_origin(mouse_pos)
+	var ray_dir = camera.project_ray_normal(mouse_pos)
+
+	var intersection = drag_plane.intersects_ray(ray_origin, ray_dir)
+	if intersection:
+		target_pos = intersection + drag_offset
+
+func _physics_process(delta):
+	if dragging:
+		# chase the target position with velocity instead of teleporting
+		var to_target = target_pos - global_position
+		var desired_velocity = to_target * drag_follow_speed
+
+		if desired_velocity.length() > max_drag_speed:
+			desired_velocity = desired_velocity.normalized() * max_drag_speed
+
+		linear_velocity = desired_velocity
+		angular_velocity = angular_velocity.lerp(Vector3.ZERO, 0.2)  # optional: damp spin while dragging
+
+		# track actual position for momentum calc on release
+		position_history.append(global_position)
+		time_history.append(Time.get_ticks_msec() / 1000.0)
+		if position_history.size() > HISTORY_LENGTH:
+			position_history.pop_front()
+			time_history.pop_front()
+
+func release_drag():
+	if not dragging:
+		return
+	dragging = false
+
+	gravity_scale = 1.0
+	linear_damp = 0.0  # reset to whatever your normal dart damping is
+
+	var velocity = calculate_throw_velocity()
+	linear_velocity = velocity
+	# angular_velocity left as-is from physics, or compute your own spin here
+
+func calculate_throw_velocity() -> Vector3:
+	if position_history.size() < 2:
+		return linear_velocity  # fallback to whatever physics already had
+
+	var start_pos = position_history[0]
+	var end_pos = position_history[position_history.size() - 1]
+	var start_time = time_history[0]
+	var end_time = time_history[time_history.size() - 1]
+
+	var dt = end_time - start_time
+	if dt <= 0.0:
+		return linear_velocity
+
+	return (end_pos - start_pos) / dt