Hey,
I need help with setting shader fire in the fireplace. I have an active opacity channel and still is visible area plane. Thanks 
moderator edit: changed title
Hey Kouba,
I would have to thing that could help it!
1. Is your opacity mask in rgb? I once fiddled around for ages until I noticed mine was in cmyk which made black appear as grey in Cinema!
2. Try to use a Corona "Light material" instead of standard, maybe that'll do the trick! You can still map your fire texture to the emission color
Good luck!