Inge E.Henriksen (inge++at++autosim.no)
Wed, 11 Mar 1998 13:34:12 +0100
>EXT AVS; Sharon Clay wrote:
>>
>> +>---- On Mar 9, 12:06pm, Rob Jenkins wrote:
>> > Subject: Re: Problem: pf2.2 + Onyx2 + Layers
>>
>> ->> ->
>> ->> ->Running the same database on these two platforms gives dramatically
>> ->different
>> ->> ->coplanar rendering results? Here we go again ... (hi sharon ;-)
>> ->> ->
>> ->> ->If you're using displacement, make sure you have a 23 bit depth
buffer on
>> ->the
>> ->> ->Onyx2. there have been problems where you don't get the FB you ask
for ...
>> ->see
>I seem to be getting what i ask for (unless pfGetPWinFBConfig is broken
>:-) )..
>23 bit depth buffer, that is.
>We are using displacement, stencil is not an option.
>> ->>
>> ->> Wait! This may not be necessary - first make sure you have patch
2919 or
>> ->> later as there was a fix in that patch that could affect precision of
>> ->> Z coordinates. Using 23 bits of Z means slower multisampled fill so
you
>> ->
>> ->patch 2919 is a 'DG SCSI RAID 2.3 Rollup' patch, not known for it's
>>
>> Woops! I typoed :-( I meant the old Onyx2 iR patch 2191 (or a more
recent
>> replacement).
>>
>> ->The latest iR patches currently released are:
>> ->
>> ->2327 for Onyx ( replaced 1808 ) and
>> ->2789 for Onyx2 ( replaced 2326 )
>We have the latest patch, 2789 installed.
>Adjusting far/near clip did not seem to improve the result at all ??
>Adding a little offset (0.01 meters) to the subfaces seems
>to do the trick though. Why? I'm a little bit confused about that.
I thought I might add that after some experimenting with objects I have
discovered
that the further away from origo an object is the more inaccurate the
polygon calculations
are. If you model a square with a subface and put it far away from origo it
will start to flicker even though the depth-buffer should be able to handle
it.
I hope this might help!!!
Greetings from Inge :|)
>BTW, anyone else who has problems with a crashing graphics subsystem on
>Onyx2's ??
>/Mattias
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