Inference lock along a random vector

[biervat]

I'm trying to inference lock along a random vector. I wrote this and it works as long as @vector is along the red/green or blue axis but it doesn't lock in any other situation. Does anyone has a solution?

@picked_first_ip.copy(@mouse_ip)
@mouse_ip = Sketchup;;InputPoint.new(@picked_first_ip.position.offset(@vector))
view.lock_inference(@picked_first_ip,@mouse_ip)