While I think it's great to link to semideau products, in this case I don't.

Good for you.

You can make z-depth renders directly in Poser without buying anything. It takes only 30 seconds to set up. Turn off all your lights. In the atmosphere material, enable depth-cue. Set the color to white.

True.

Please do not encourage people to buy something they have already.

I'm not encouraging anybody to buy anything; I'd like to think that people can make their own minds up about how they solve this particular issue in Poser, and I don't appreciate being asked not to do so.

There are other things in his products worth getting, but if all you want is to do a z-depth render, then ...

I'm simply passing on a recommendation for a $5.00 product which I have found extremely useful, and which takes even less time to initialise than 30 seconds; it includes other useful render modes too.

My self-build system - Vista 64 on a Kingston 240GB SSD, Asus P5Q Pro MB, Quad 6600 CPU, 8 Gb Geil Black Dragon Ram, CoolerMaster HAF932 full tower chassis, EVGA Geforce GTX 750Ti Superclocked 2 Gb, Coolermaster V8 CPU aircooler, Enermax 600W Modular PSU, 240Gb SSD, 2Tb HDD storage, 28" LCD monitor, and more red LEDs than a grown man really needs.....I built it in 2008 and can't afford a new one, yet.....!

My Software - Poser Pro 2012, Photoshop, Bryce 6 and Borderlands......"Catch a  r--i---d-----e-----!"