Opacity mapping

how can i make opacity mapping using Vray Material? It doesnt hv an opacity slot where i can place a blackwhite alpha… please help. Thanks

remember, opacity in vray in controled by refraction. so you put it in the refraction slot. however you will need to alter the IOR to compensate. so put it to 1.0 for IOR

Thanks Da_elf for the quick response. You da man!