I done a quick search for z-depth and only found lack luster queries and responses,
I'm sure it can be done it HItfilm , I'm just wondering if anyone has solved it before I re-create the wheel.
Imagine a single image with an alpha channel.)lets say its a bunch of boxes in a room (box 1m*1m*1m*) Scene is 40 meters deep, now imagine the same alpha channel with gradients of grey and white at 1m,2m,3m, 4,5,6 as far as 10 meters
Then a second alpha channel gradient at 20 meters,24 meters 28,3236,40
If you keyframe the blur contribution on an alpha you can "refocus the camera" check out ,the third and the seventh by Alex Roman ..its after effects, not hitfilm but its the premise around the query...
If you can apply these to a still image (with adjustment of blur, you create a depth of field), in 3d this is z-depth..ie how far you want to apply a blur from the camera (the z of the lens) and when you want definition of subject, followed by background blurring but applied in post not direct rendering.
Applying z depth to a 3D render is bad practice, as sometimes you need to refocus the camera to another area, z-passes do this with a fast render time, if it is in the initial render it means another run of rendering..
I'm sure when of the video gurus here have figured it out and if someone can point me in the direction of the requests page, I'll place a request.
For me its one of the most important things in a video package, I hope I missed the tutorial on how to do this.
I'm going to give a go at creating this, but would love if someone has figured this out already without making several masks and composites...