Three ways you can do this, as far as I know.
One using a product called PWCatch http://www.daz3d.com/shop/pwcatch/
Two using the Shader Mixer http://forumarchive.daz3d.com/viewtopic.php?t=120228
and three doing it in a image manipulation program (Photoshop, Gimp etc)
Thank you. Since I am learning this I’m working through tutorials, and your second suggestion sounds like exactly what I’m needing.
I’m following the tutorial step by step but am getting different results. Right from the beginning my screen looks a bit different to the one in the video. I’m hoping that it’s just a difference between versions (3 vs 4) and not a show-stopper.
The first difference is with Shadow Catcher - in the tutorial, applying the SC results in the plane turning black where it will be transparent and white where it will be opaque. For me I still get a black shadow on a gray plane.
And then when you connect the “in shadow” to Opacity Color, the tutorial shows the shadows without the plane after render. I get the same black shadow on a light-gray plane.
Any idea what I’m doing wrong?