move Physics2Dserver RID with mouse in Godot

Question

My goal is detecting the RID when mouse is hovering it and the next goal is to move the RID when the mouse click on it. I have one idea to make this work which is to make another RID which follows the mouse and detect when colliding but just wondering if there's a proper way of getting RID with mouse.

func Create_collision(mouse_position):
   xform = Transform2D(1.0 , mouse_position)
   #var _shared_Area = Area2D.new()
   body = Physics2DServer.body_create()
   Physics2DServer.body_set_mode(body, Physics2DServer.BODY_MODE_RIGID)
   var _circle_shape = Physics2DServer.circle_shape_create()
   Physics2DServer.shape_set_data(_circle_shape, 128)
   Physics2DServer.area_add_shape(body, _circle_shape, xform)
   Physics2DServer.body_set_space(body, get_world_2d().space)
   Physics2DServer.body_set_state(body, Physics2DServer.BODY_STATE_TRANSFORM, Transform2D(0, Vector2(10, 20)))
   Physics2DServer.body_set_force_integration_callback(body, self, "_body_moved", 0)
   return _circle_shape.get_id()

func _body_moved(state, index):
    # Created your own canvas item, use it here.
    #VisualServer.canvas_item_set_transform(canvas_item, state.transform)   
    print("moving ojbect",state, index)

another way is to use intersect_point but it does work with RID ojbect for some reason: example code

func mouse_detect():
    #print("get_space()" , get_world_2d().get_space().get_id())
    
    #var space = get_world_2d()
    var space = get_world_2d().get_direct_space_state()
    
    #var space = get_canvas_item()
    # Get the mouse's position
    var mousePos = get_global_mouse_position()
    # Check if there is a collision at the mouse position
    #if space.intersect_point(mousePos, 1, [], 2147483647, true, true):
        #print("hit something",mousePos)
    
    if space.intersect_point(mousePos, 1 , [] ,2147483647 , true , true ):
        print("hit something",mousePos ,space)
        
        
    else:
        print("no hit")
        #pass
enter code here

I would suggest `intersect_point`, and it looks correct at first glance… Are you using extra `Viewport`s? That could be messing up the coordinates. Aside from that, perhaps you need to make the the body or area monitorable (e.g. `area_set_monitorable`). Also make sure the `collision_layer` is non-zero. Refer to [FauxBody2D](https://stackoverflow.com/a/71622366/402022). — Theraot, Jul 29 '22 at 02:00
the mouse_detect() function is finally working with the RID i added this fucntion (Physics2DServer.area_set_space(body, get_world_2d().space)) — alex hernandez, Jul 29 '22 at 03:03
i also added the *** area_set_monitoable*** it started working with the mouse_detect i need to figure out how to get the id of the collision now — alex hernandez, Jul 29 '22 at 03:05
If you are using `interect_point` and you want the RID, you can get it from the returned value. See the documentation on [`interect_point`](https://docs.godotengine.org/en/stable/classes/class_physics2ddirectspacestate.html#class-physics2ddirectspacestate-method-intersect-point). You an array of dictionaries, and one of the keys is `"rid"`. — Theraot, Jul 29 '22 at 07:44
I believe the key `"collider_id` holds an instance id, see [`instance_from_id`](https://docs.godotengine.org/en/stable/classes/class_%40gdscript.html#class-gdscript-method-instance-from-id) and [`get_instance_id`](https://docs.godotengine.org/en/stable/classes/class_object.html#class-object-method-get-instance-id). — Theraot, Jul 29 '22 at 07:46
i got it working just i (print(space.intersect_point(mousePos, 1, [], 2147483647, true, true))) and it return an arrary of object ids also this case is close but im leaving this if anyone needs help thank you so much for helping — alex hernandez, Jul 29 '22 at 18:25
hey theraot do you have any big project in godot or any other cause seems like you have a lot of experience in programming/coding — alex hernandez, Jul 29 '22 at 18:28
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/246891/discussion-between-theraot-and-alex-hernandez). — Theraot, Jul 29 '22 at 18:43

score 1 · Accepted Answer · answered Jul 29 '22 at 18:38

the best way to get Collision RID by mouse is using the mouse_detect() function also this is also the most optimized way. and when adding a image use the visual server with a circle image cause when the VisualServer.canvas_item_add_circle it causes performance issue by 10 times less speed.

var xform : Transform2D
func Create_collision(mouse_position):
    xform = Transform2D(1.0 , mouse_position)
    var _shared_Area = Area2D.new()
    var _circle_shape = Physics2DServer.circle_shape_create()
    Physics2DServer.shape_set_data(_circle_shape, 64)
    Physics2DServer.area_add_shape(_shared_Area.get_rid(), _circle_shape, xform)
    Physics2DServer.area_set_space(_shared_Area, get_world_2d().space)
    Physics2DServer.area_set_monitorable(_shared_Area, true)

func _process(delta:float ) -> void:
    mouse_detect()

func mouse_detect():
    var space = get_world_2d().get_direct_space_state()
    var mousePos = get_global_mouse_position()
    if space.intersect_point(mousePos, 1, [], 2147483647, true, true):
        print(space.intersect_point(mousePos, 1, [], 2147483647, true, true))

move Physics2Dserver RID with mouse in Godot

1 Answers1