added getglobalmouseposition function

Scripts/camera_3d.gd

@@ -0,0 +1,11 @@
+extends Camera3D
+
+@export var rayLength: float
+func getGlobalMousePosition() -> Vector3:
+	var space = get_world_3d().direct_space_state
+	var mousePos = get_viewport().get_mouse_position()
+	var from = self.project_ray_origin(mousePos)
+	var to = from + self.project_ray_normal(mousePos) * rayLength
+	var query = PhysicsRayQueryParameters3D.create(from,to)
+	var collison = space.intersect_ray(query)
+	return collison.position