Just found out that we actually have 8GB RAM and a separate GPU for each screen.
Unfortunately Java does not seem to accept any heap size greater than 4096MB.
A more pressing need is to solve a problem where in stereo mode we loose half our geometry as seen through the RIGHT goggle lens. The LEFT lense is fine but the RIGHT lense sees the geometry minus some bits.
I have set the stereo enabling through the configuration file.
The loosing of bits of the geometry seems to be happening on two of our screens with varying degrees. One of the screens is simply just perfect, even in stereo.
To make things even more confusing, the geometry is perfect when stereo is off meaning that the source code is "right". Hence I think it is to do with optimising Java3D on IRIX. Any suggetsions welcome.
Does anyone know if setting the config file causes Java3D to use Software rendering or Hardware rendering?
Cheers,
Gobe
//--------------ORIGINAL MESSAGE----------------------------------------
We have just set up SGI's Java3D ver 1.3 in a three-screen CAVE running on an IRIX platform and are experiencing what might be some optimisatiion issues. We have a program that runs almost five times faster on a Windows PC with a 64MB graphics card than it does on our IRIX machine which has 256MB graphics memory and twice as much RAM.
//----------MARK HOOD RESPONSE-----------------------------
Sounds like you might not be getting multi-pipe rendering on the SGI. Is your Windows PC driving three screens as well? You may be comparing the performance of a machine driving one screen with the performance of a single GPU driving 3 screens. If so, the key is to get the SGI driving each screen with its own GPU.
Do you have the Xinerama multi-screen X11 rendering extension turned on? You may want to turn it off for the SGI and set up each screen as an independent display; that works much better in Java 3D 1.3. In 1.3.1 we added code to transparently access the graphics resources across multiple screens without the excessive overhead of Xinerama, but that was a Solaris-specific revision.
-- Mark Hood
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