ENH - Since renderers are rendered backwards from numlayers->0, the z-buffer data is wiped out for all but the last rendered layer (0).  For multiple-layer renderwindows, we need to perform a pick render before accessing z-buffer info, or else we will get renderer[0]'s z-buffer info.
ENH - Since renderers are rendered backwards from numlayers->0, the z-buffer data is wiped out for all but the last rendered layer (0).  For multiple-layer renderwindows, we need to perform a pick render before accessing z-buffer info, or else we will get renderer[0]'s z-buffer info.

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