So I feel like I’ve learned a lot from the latest round of Bartek Skorupa’s compositing tutorials on Blender Cookie, but I’ve run into an issue with the refraction pass that I just don’t understand. I thought I’d set it up exactly the same as in the tutorial, but when I add the refraction pass, it seems to be adding black - how is it even possible to “add” black?
I’m a little perplexed. Attached is the .blend file. I’m not new to the compositor so much, but I am new to some of the techniques he’s prescribed in the tutorial, so I’m really not sure at which step along the way I did something incorrectly.
Any help would be much appreciated.