z-buffer matters when depth test's off?

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Hansong Zhang (zhangh++at++cs.unc.edu)
Wed, 16 Apr 1997 15:46:32 -0400 (EDT)

Hi all,

I found something wierd and wonder if anybody knows why. In a special
rendering of a scene I turned Z-buffer off. Because z-buffer was off I
cleared only the color buffer before rendering. Turned out some polygons
were missing, leaving cracks in the image. I was puzzled and suspected
everything. The problem remained the same on iR (2 RM6) and Max
Impact. I've just found that if I clear the Z-buffer also, the cracks
are gone.
The problem's "solved" but I still don't understand it. Any ideas?

Thanks,

Hansong

-------------------------------------------------------------
Hansong Zhang \ zhangh++at++cs.unc.edu
Walkthrough Group \ http://www.cs.unc.edu/~zhangh
Department of Computer Science \ (919)962-1835 (O)
UNC-Chapel Hill \ (919)914-3973 (H)

"I create abstract systems from pure information, Albert. I'm
a *programmer*... Quantum nonlocality is a bug." -- God
-------------------------------------------------------------

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