I'm new to Fusion and this seems to be an easy one, but I haven't been able to crack it for a while...
I'm using a Mental Ray shader called 'ZdepthDOF' which creates a grayscale image to represent your scene depth.
It doesn't, however, create an ACTUAL z buffer pass - rather, it gives you a luma pass.
I want to know two things:
1. What's the way to create a flow which will convert luma to z-buffer.
2. or... Is there a way to tell Fusion to use luma as a grayscale map controler for blur. I know Shake has an option like this called "iBlur" which lets you reference two images: a source image, and a blur control image.