Blam addon ?

I tried the BLAM script addon
and I cannot keep lines added in viewport ?

is there a bug in 2.78 or a good short video to show how to use it in 2.78 ?

thanks
happy bl

check here
Thread: [Add-on] Camera Calibration using Perspective Views of Rectangles

so this means that the old BLAM does not work anymore !
and no one made an update for it in 2.78!

thanks
happy bl