Optoma Geo Module BE-BWM01 - Manual (Page 6)

14. Enter the quantity of horizontal and vertical projectors used to build the final image -
In this example we are using two projectors horizontally and 1 projector vertically.
After this, enter the number of blocks in the overlap area from step 8.
15. Select the resolution of your content – this will determine how each projector scales
the original source. NB: If you would like your content to fill the whole of the final
image, even if it is stretched, be sure to select "Scale to fill screen" in the "crop"
option. Alternatively the image will be cropped if the aspect ratio does not match
the final blended image.