Hello, I have one problem, because i can't choose silhouette edge as indicated in the picture. 

I try this with use this command: 

Extension.SelectByRay -0.394123100092543, 0.300000000000011, 0.219906225971828, 0.707106781186549, -0.707106781186546, 0, 5.68736603034926E-04, 46, True, 0, 0 

Sorry for my english. Thanks for help.