Ok what are you exactly saying by Z depth image?

understand partly you looking for something along z axis, but need more clarification

flowers are clever things, even if it looks like They've vanished,
They never really go away- like a pack of wolves.  As long as
there's a moon, flowers will never die.  And neither will us wolves...
     -Wolf's Rain -     
L.Yucalevich III
Lord Darkwolf
Dragon Wolf Designs