From: Angus Dorbie (dorbie++at++sgi.com)
Date: 01/18/2000 10:39:10
To guarantee this you need more than frame locking.
Frame lock helps, however if one of the channels frame extends (doesn't
finnish in time to swap on vertical retrace) you need to prevent all
pipes from swapping, even those which have issues a swapbuffers call. In
a high performance application this requires swapready.
Cheers,ANgus.
Allen Bierbaum wrote:
>
> You don't necessarily need to use TCP/IP to do the syncing of data
> betwen the machines.
>
> I actually had a VR library (using Performer and OpenGL) working between
> two Onyx machines using MPI as the communication method. So it is
> possible.
>
> There are two problems that you will run into though.
>
> 1. I am assuming that you will have contiguous viewing channels
> displayed side-by-side from multiple channels. When doing this, there
> is not "guarantee" that they will be displaying the same frame. For
> this you need framelocking. With an SGI IR pipe, you can get this, but
> most PC based gfx cards do not allow for frame-locking.
>
> 2. The bigger problem is that I assume you will be using stereo displays
> for VR. For this you will probably need true genlocking to guarantee
> the correct stereo buffers are displayed together. I have heard of a
> few PC card companies claiming support for genlocking, but I have seen
> none of these solutions actually working.
>
> -Allen Bierbaum
>
> allenb++at++vrac.iastate.edu
> VRAC - Virtual Reality Application Center
> Iowa State University
>
> Mohamad Hanapiah wrote:
> >
> > --- Brian Furtaw <brian++at++sgi.com> wrote:
> > > I have done a considerable amount of work on
> > > clustered machines please
> > > describe your problem.
> > >
> > > Brian
> >
> > Hmmm.... Never thought I'm going to get so much reply.
> > Thats a good sign. OK. Currently I'm developing a
> > virtual reality system on a cluster computer running
> > on LINUX. I plan to use Performer. I have been using
> > MPICH and PVM(library for parallel programming) for
> > communication between nodes.
> > My problem is how to integrate MPICH/PVM with
> > Performer??
> > Do I really need to go to the lower-level(TCP/IP or
> > UDP programming)??
> >
> > Izatul.
> >
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--
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