for the depth map try this one:
Just open the ShaderMixer, select New in the File menu (of the ShaderMixer), change the selection to Camera, in the “Bricks” choose “All Bricks ->Roots ->Volume” and drag it into the Brick yard.
In “All Bricks -> Functions -> Volume” select “Fog-Simple” and drag it as well into the Brick yard.
Connect the “Color” and “Opacity” output of the Fog brick with the “Ci” and “Oi” input of the Volume brick.
Click on the “Create” button and choose as you wish in the opening window.
“Background” let’s you choose the color of the fog/depth effect, “Start Distance” lets you choose the depth of the effect. The default of 500 is far to close for an average scene, start with something like 1000 or 2000.