How can I get a z depth pass in CoD 4 via console?

I want to make a Call of Duty: Modern Warfare fragmovie and to make it look cool, I have to render several passes from my demos. To get some cool effects in the post, I would like to render a depth map from my demos.
My question is, does anyone know how to achieve that?
So far I used this console command:
r_floatZDebug 1
And this is the visual feedback I get from the renderer:
Even though this one is coloured, this is actually something I could work with. But as you can see, its not Fullscreen. Does anybody know how to force it? Or any other command than can get me what I want?
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How to use console COD4?
To use the cheat codes in the PC version of COD 4: Modern Warfare: From the main menu, select Options > Game Option > Enable Console to activate the cheat console. Press the tilde key (~) to open the dev-console.How do you use detonators in Call of Duty?
Also, detonation without double-tapping reload or use is faster; tapping the equipment button once deploys the explosive, while pressing the button anytime later will immediately pull out the detonator, click it, and quickly put it away; this takes about as much time to complete as calling in a Spy Plane or Counter-Spy ...BYE BYE COD4 :D
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Images: Ketut Subiyanto, Andrea Piacquadio, Ketut Subiyanto, FOX