Organization: Silicon Graphics, Inc. Mountain View, CA
References: <92350.143855SML108@psuvm.psu.edu>
Date: Thu, 17 Dec 92 01:44:07 GMT
Lines: 14
In article <92350.143855SML108@psuvm.psu.edu>, SML108@psuvm.psu.edu writes:
> I have a question for any SGI engineer types reading this... If an Indigo
> has the starter graphics option, but no hardware Z-buffer, it can simulate
> a Z-buffer using the machine's memory and software. However, if one has
> the 24 bit color graphics board installed, one must have the hardware
> Z-buffer and software Z-buffering is disabled... Why was this done?
> This seems to be a really dumb feature...
>
Not really. The starter graphics option did not (for any amount of $$$) have a hardware z-buffer option. So z-buffering was implemented in software.
The 24 bit color graphics board you allude to cannot/does-not share graphics software with the starter. However for about $2k you can get really fast 3D (z buffered) operations. There wasn't any special effort made to "disable" the soft-z.