We've been using Arnold and experimenting for a while, trying to imitate our previous renders in order to stay consistent with our previous outputs (S-1) but, of course, there are still differences that can't be helped. Anyway, we tried using the Shadow Matte for the flooring of our projects. It looks ok when you see it in the render window (S-2).
In the render window, you don't see the shadows that are received by the Shadow Matte Map but when you save it (S-3), you'll see that there are subtle shadows found at the corners of the booth.
In our previous set-up in Mental Ray, we usually just put one light, a daylight in CIE mode, and a shadow/matte/reflection plane. In the shadow/matte/reflection plane, we turn off the receive shadows option so we can only see the reflections. We didn't touch the Exposure Control settings for our CIE renders. In the new Shadow Matte Map, there's no option whether you can receive shadows or reflections unlike in its Mental Ray counterpart so I'm wondering if there's anyway to remove the shadow and only leave the reflection and vice-versa. We save our renders in PNG format in order to be more flexible with our final backgrounds.
Below are the settings I used for the Arnold renders (S-3 and S-2).
I hope you guys can help. Thanks!