If the source code of the game is available, then the game can be easily modified to trigger effects. In the current pro-totype, the game sends networking messages to the Il-lumiRoom system in order to toggle illusions on and off.
The position and orientation of the player (or often, equiva-lently, graphics camera) in the virtual world may be sent to
drive the Peripheral Flowillusions. With access to source-code the game can support Focus+Contextillusions by
conducting a second rendering pass using a wider field of view. In our prototype this information is sent to the Il-lumiRoomsystem through a texture residing in shared memory