Here's a nice little quick tip on how to make your Z-Depth output visible.
If you link the Z Depth output socket of an Input | Render Layer node to an Output | Viewer/Composite Node, you'll get a completely white, meaningless image.
The point is that the Z-Depth output represents the depth map of your scene (from the near-clip plane to the far-clip one) storing the data in a 32 bit format, but you can't see the whole range on your screen.
Was this useful for you? If you have any other such quick tips, please share them :)
