Which Nthusim version did you used? That version have edge blending right? I saw there are big overlap of the projections while setup but no edge at game :)
NTHUSIM now has edge blending capability in the new 3.0 version released in April 2011.
What type of material is used for the projector screen (please give details) that was setup at the house of blues event? Where can something like this be purchased?
The particular material used for the screen at the HoB AMD event was white Rose Brand Tendo cloth. It is sold for $22 a linear yard and is 122" wide on a roll so you can make some really big screens with it. It is a spandex stretch cloth material. You have to watch out to barely tension it or it'll bow towards the projectors when used in a circular screen design. The potential bowing is the down-side with this material, but the up-side is that there are no ripples or sagging that occurs when under tension. Tendo comes in a few colors -- including gray and white. I have only used the white. I might use gray next time for improved projection color properties. This is something I'd need to experiment with though. Rose Brand sells sample strips of all their materials. I'd suggest picking up a sample before commiting to this particular cloth. The sample will better help you understand the properties of the material and give you a better idea of if it's right for your particular build. Although this is used as a screen material, it is used primarily for it's ability to conform to nonuniform surfaces and not for it's projection properties. It's mostly used for ambient light applications and not high fidelity projection. It tends to diffuse the light projected on it a bit. This has both posative and negative properties. Sharpness is effected, but also this helps lesson projector screen-door effect and projector overlap visibility.