Are you trying to get the mouse coordinates?
get_global_mouse_position()
and get_local_mouse_position()
are both methods of CanvasItem
, so if you're using a 2D node, you can use "CallSelf" and call one of those functions.
Otherwise, your best bet is to add mouse click action(s) to the Input Map, and use the Input.is_action_pressed()
function. You can get this from EngineSingleton -> CallInstance.