without knowing what you intend to create, or even how many projectors you are using, it's hard to offer much insight.

a mac pro (or similar pc) with 4 nvidia gtx gpus gives you a total of 8 outputs. you can create 4 separate apps to run on each GPU, and possibly utilize more of the mulitcore CPU resources.

matrox dual/triple head2gos are also great for multiple projections.

for an LED wall of video.....

if you wanna do it cheap...look into making yourself an RGB value renderer from media input from disk or camera. use jitter to split up planes of video and then use pixels for DMX values to RGB fixtures. philips made stuff is reliable, tons of cheap chinese and korean manufacturers of LED stuff. you can get cheap led strips and install well and do a low res video render in jitter. if you buy units that snap together ethernet and do all the rendering for you as you send it video feeds it will be much more expensive because you push up into the entertainment industry stuff by barco, martin, dactronics, petes big tvs etc...

if you have the budget for it.... i really dig the komaden translucent mesh video

B

Thank you both - useful information. While I'm personally interested in the make-your-own idea, the client has aspirations to fancy, so I've been researching the modular 46" LCD panels (mentioned by piwolf above) - expensive (about $40K US per 6 ft x 10 ft wall) but could look interesting. But a lot less expensive than pre-made LED panels. Now I have to search for all those "multiple video cards with Jitter" posts I never read in the past!

Know any websites or artists doing interesting work with modular panel LCDs, I'd appreciate a pointer.

Thanks again,

John

I'm wondering if you could set up a video wall via mac mini—> triple head 2 go—> 3 lcd panels, times as many networked modules as you need.

These people are doing something similar: http://www.squarebox.co.uk/threshold.html