Im not sure is this is way off topic. Does anyone have any resources on the blending of an opengl display using 2 projector. ie: I have an opengl program, I have 2 video cards, I have 2 projectors, and I would like to display one image with edge blending. The 2 monitor option in windows works but the image is panneled and not continuous. Any help??? |>

What do you mean by edge blending?

so is you have one large screen
with 2 projectors projecting one image
the image is tiled.
ie
|1/2| |1/2|
This does not look good.
What I am looking for is info on
how to make the 2 1/2 images overlap
by a few pixels so that it is one continuous
picture on the screen.
Hope that makes sense.

I''ve never tried to do this, so take this with a grain of salt.

There are two things that you are talking about:
1) getting the two projections to line up without some blank wall in between
2) spanning an image across the two projections so that you aren''t just looking at the same display twice

For 1:
Don''t try to blend the overlap. Rather, just try to line up the projections so that there isn''t a gap or bright line where they meet on the projection surface (wall, etc).

If you do try to use a couple pixels of overlap, you''ll still have to line up the projections as above. Then you''ll have to make sure that the overlapped sections of the projections combine to the right amount of light (otherwise it will be extra bright there). Basically, you will have to send those pixels at 50% of their normal intensity. Not recommended.

For 2:
If you have two video cards, you should be able to send a unique display to each projector. This is the interesting part, and I don''t really know how to do it. Windows lets you span the desktop across two displays. I would try to get that working first and then see if OpenGL adapts automagically. Otherwise, you may be looking at having two distinct display contexts.

cheers