From: bert's account (lberto++at++clubfed.sgi.com)
Date: 03/21/2000 10:10:28
I guess you have the special monitor cable with the BNC dongle
(part # 13W3-13W3HV) which allows you to get the sync out of channel
0 of the master pipe? If so, continue....
connect the sync output of pipe 0 channel 0 to genlock in of pipe 1,
(be sure that channel 0's sync out is set to composite) and genlock
loop through of pipe 1 to genlock in pipe 2, ...!
In ircombine under edit globals set the sync source to internal
for pipe 0 and external for all other pipes!
O.Riedel++at++CENIT.DE wrote:
>
> Hi Allan,
>
> Can you please explain the SMOC a little bit in deepth? We have genlock
> problems (may be caused by SMOC) with a 3 pipe (an up) machine and do not
> have very good explantion right now about all the influences from:
>
> * cabeling
> * ircombine
> * and vfc
>
> The PFCHAN_SWAPBUFFERS is activated.
>
> Cheeers
> Oliver
>
> ------------------------------------------
> Dr.-Ing. Oliver H. Riedel
> Director Virtual Reality
> CENIT AG Systemhaus
> o.riedel++at++cenit.de
> phone +49 (0)711 780 73 349
> fax +49 (0)711 780 73 649
> Schulze-Delitzsch-Strasse 50
> D-70565 Stuttgart/Germany
>
> -----Ursprüngliche Nachricht-----
> Von: allan++at++sgi.com [mailto:allan++at++sgi.com]
> Gesendet am: Montag, 20. März 2000 23:10
> An: Devrim Erdem; info-performer++at++sgi.com
> Betreff: Re: 3 Pipe Onyx Genlock
>
> On Mar 20, 10:43am, Devrim Erdem wrote:
> >
> > I will be using a 3 pipe onyx soon and having no experience on the 3
> > pipe config , I will build a question :
> >
> > In what circumstances, a 3 pipe onyx config will need genlocking for
> > a 3 pipe performer app ?
>
> For most multi-pipe Performer applications the answer is "always".
>
> The definition of genlock is the synchronization of two (or more)
> video outputs, such that the horizontal and vertical sync signals are
> aligned. Users of multi-pipe vis-sim programs typically require the
> pipes' video outputs be genlocked so that monitor refreshes occur
> simultaneously on all pipes.
>
> When multiple pipes are being used to view a single out-the-window
> scene you want the video timing to be in lock-step so that new frames
> appear simultaneously on all three screens. If you didn't synchronize
> them (didn't genlock them) then you might see a disparity at the edges.
>
> Activating genlock is just a SMOC (Simple Matter of Cabling) and some
> fiddling with ircombine to activate it.
>
> Another multipipe synchronization issue to think about is the timing
> of the framebuffer swap on each pipe. Imagine if the pipes were
> unbalanced -- one pipe running at a 60Hz frame rate (perhaps a side
> view) and the other at 30Hz. if there were NO synchronization you'd
> see disparity at the edges again as the 60Hz pipe moved along before
> the 30Hz pipe caught up. This would be quite disconcerting :-). Use
> the pfChannel share-flag PFCHAN_SWAPBUFFERS so that Performer can
> synchronize all the channels' framebuffer swaps for you.
>
> Allan
>
> --
> Allan Schaffer allan++at++sgi.com
> Silicon Graphics http://reality.sgi.com/allan
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-- See Ya,Lawrence Eugene Bertoldi Technical Consultant vnet 238-8949 Silicon Graphics phone 301-572-8949 Silver Spring MD. email lberto++at++clubfed.sgi.com
~;-}>
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