How would I configure a joint for a swinging grappling hook?

[jak6jak]

I want to create a grappling hook that you can swing on. So far I've tried the JoltGeneric6DOFJoint3d with the linear xyz limits set to the distance from the hit point. This causes me to constrained in like a box and not actually swing.
Here is the code I'm using:

func _physics_process(delta):
	
	var xzVelocity = Vector3(linear_velocity.x,0,linear_velocity.z)
	
	# Add the gravity.
	if FirstFrameGrapplingShot and not grappling:
		var viewPortSize = get_viewport().size
		#var from = camera.project_ray_origin(Vector2(viewPortSize.x/2,viewPortSize.y/2))
		#RayCast.target_position = from + camera.project_ray_normal(Vector2(viewPortSize.x/2,viewPortSize.y/2)) * 100
		print(viewPortSize)
		var hit = RayCast.get_collider()
		FirstFrameGrapplingShot = false
		if hit  != null:
			print("Grapple hit")
			Joint.set_node_b(hit.scene_file_path)
			grappling = true
			Joint.set_linear_limit_x_enabled(true)
			Joint.set_linear_limit_z_enabled(true)
			Joint.set_linear_limit_y_enabled(true)
			var Distance =  transform.origin.distance_to(hit.transform.origin)
			print("Distance", transform.origin.distance_to(hit.transform.origin))
			Joint.set_linear_limit_x_upper(Distance)
			Joint.set_linear_limit_z_upper(Distance)
			Joint.set_linear_limit_y_upper(Distance)

			#Joint.limit_enabled = true
	# Handle jump.
	if Input.is_action_just_pressed("jump"):
		apply_central_impulse(Vector3(0,jump_velocity,0))

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.

	var input_dir = Input.get_vector("left", "right", "forward", "backward")
	var direction = (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
	if direction.length() > 0 and xzVelocity.length() < max_walking_speed:
		#print("Speeding up")
		if not grappling:
		
			move_and_collide(direction *walking_speed* delta)
		else: 
			print("Grappling")
			apply_central_force(direction * swing_speed)
	else:
		#print(direction.length())
		#print("slowing down")
		if not grappling:
			var xslow = move_toward(linear_velocity.x,0,SPEED)
			var zslow = move_toward(linear_velocity.z,0,SPEED)
			move_and_collide(Vector3(0,linear_velocity.y,0) * delta)

Thanks for any help provided.

[mihe]

Since this isn't a Jolt-specific question per se, I would recommend you seek advice in some of the more general Godot communities, like its new forum, its Discord or its Subreddit, as seen here.

With that said, I would imagine a simple PinJoint3D (or JoltPinJoint3D) should suffice, depending on what kind of movement you want to allow. Just leave the joint nodes empty and then once you've hit with the grappling hook you move the joint itself to where you want the pivot to be (i.e. where the grappling hook hit) and then set node_a to be the body you're grappling onto and node_b to be the swinging body. Then when you release the grappling hook you clear the joint nodes again.