Sry if i posting on wrong Thread amm about material i have a question
://i59.tinypic/2z905c0.jpg
So what i need to do to make that black thing to be transparent like just to see the chain but somehow i cant get it work 
-connect the alpha channel with “opacity mask”
-set the blend mode to “masked”
-create an alpha channel in photoshop or gimp 
-> ?v=_T5utHSSu5w (not the best tutorial, but it shows how it works)
Tnx for replay will try
If you want better quality 8 bit opacity that dont need anti aliasing or something you may use opacity and set material translucent.