This thread is kind of old, and I don't know if anyone's listening any more...but if you are... As headhunter said, the Z-buffer indicates how deep into the scene each pixel is. This is useful for external depth-of-field programs, like Defocus Dei from MooTools (http://www.mootools.com/plugins/us/defocus/index.htm) Although Vue can do its own depth-of-field processing, Defocus Dei can do some additional things like modifying hue or color saturaton based on depth. There is a convoluted way to generate depth maps (Z-buffers) with Poser, but it is a lot of work. It is nice that Vue easily generates them. lynn