From: Allen Bierbaum (allenb++at++vrac.iastate.edu)
Date: 01/16/2000 19:56:00
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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