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When multiple projectors are used to project a seamless image on an irregular surface, the projected image for each projector has to be manipulated in order to produce one seamless projected image.

Geometrical correction (Warping): is a process of manipulating the pixel positions of the original projected image to make the projected image look right and geometrically correct when the image is projected on an irregular (curved) projection screen. The horizontal and vertical projected features and lines will follow the contours of the projection screen.

Soft-edge blending: is a process of digitally manipulating the overlapping parts of the projected images so that the total combined projection looks like one continuous image. This process involves overlapping the images edges of the neighbor projects, and fading in and out the projected images edges. In this way, when projected on the curved surfaces the overlapping projected images will perfectly blend and produce one continuous image.

The most graphical cards support more than one graphical output. External MatrocDualhead2Go or TrippleHead2Go allow to extent one output to 2 or 3 outputs.
Just connect the multiple outputs to multiple projectors; use a curved cylindrical or spherical screen and use Fly Elise-ng Immersive Display software to calibrate the projectors and run Windows 7 / Windows 8 desktop or any other DirectX or OpenGL game on your immersive projection setup.

Immersive Display software is the best, most versatile and most affordable warping and soft-edge blending software for professional and consumer markets made by Fly Elise-ng.