Zdepth Reflections

[rombo]

I am trying to achieve an effect which requires reflective zdepth perception from the materials - Like, keeping my focus on a background, then animate the focus to focus a glass surface, and then focus the reflection. Is this possible to achieve in any way with the Corona Renderer using Zdepth, instead of painfully having to render the whole of the animation frame by frame with DOF?

I know this is possible with Vray by correctly configuring materials to respond to all channels, but I couldn't figure out a way in Corona.

Thanks,

[rombo]

As an add on, this would be cool to comp zdepth over glass with reflections. One pass with simple zdepth where glass lets the z rays through, one pass with reflected zdepth to blur a reflection pass before comping it atop a regular beauty pass.
Thanks,

[Ondra]

kinda duplicate: https://forum.corona-renderer.com/index.php/topic,8468.0.html