I'm making a scene where a smoke is flying behind a glass door. (The smoke is from videocopilot, cgi). This door have 9 glasses in mosaic. I'm closing the door to prevent the smoke for coming out. But the thing is: That I want to make these 9 glasses be transparent, so I can see the smoke trough the glasses.
I tried to make a feather mask in each glass, but it looks so fake.
You're making the right start. I would suggest not masking out the glass (if you don't mind me saying, we would usually say 'panes of glass'). Instead, draw masks on a solid layer and use that layer as a track matte for the smoke. The masks should be animated, using keyframes to match the position of the panes. Reduce the opacity of the masks. You don't want them to be completely transparent, or you'll see no smoke. Then you could try tinting the smoke where it is seen through the glass, making it appear whiter.