[PD] PD and GEM for virtual environments

doktorp doktorp at mac.com
Tue Feb 1 01:21:24 CET 2005

Out of curiosity, how does one enable this second option (2 separate 
sub windows?)

A good friend of mine and I are working on a project (well, im helping 
him with some basic stuff..)... for doing 3D video playback from 
stereoscopic footage shot while skydiving. He has mounted 2 cameras to 
his helmet and has recorded some footage, and we are looking for easy 
ways to send frame accurate (read synched) video to two projectors, and 
will probably end up using polarized filters and glasses to view. We 
last tested max/jitter using a very large 1600x600 (2 800x600 
quicktimes 'glued' together) and using jit.scissors to separate them to 
two instances of jit.window. Even on a dual G5 2.5 Ghz with 4 Gb ram, 
we dropped frames using mjpeg codec, but uncompressed video seemed to 
be ok. I would like very much to use Gem, but since one cant 
instantiate two windows (on OS X at least..), I thought it might not 
work... I dont think that G5 ever worked that hard, which to me was 
very very surprising.

Does anyone have any example patches doing something similar, and 
keeping proper frame synch from either one, or two pix_movies? I have 
great faith that Gem and PD will be much smoother.

Thanks much. You guys are all too cool!

These projects sound very interesting..


On Jan 31, 2005, at 2:56 AM, IOhannes m zmoelnig wrote:

> Peter Brinkmann wrote:
>>     - How well does GEM support stereo viewing?
> right now, there are 2 stereo-modes in Gem, anaglyph (e.g. red/green) 
> and one with 2 separate sub-windows (both in one "real" window).
> anaglyph renderign is probably not what you want.
>> Any thoughts would be appreciated!
> btw, the multiple_window feature could likely be what you need for a 
> cave-like situation.
> in theory you could have one instance of Gem on one master-computer, 
> and several slave-renderers (via remote windows)
> this would (right now) only work under linux and i am pretty sure that 
> you could not deal with large textures. (i once did it with live-video 
> forwarded to 1 single slave, which worked, but never tried several 
> slave-machines (multiple_window did not exist back then)
> mfg.a.dsr
> IOhannes
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