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Backseat virtual reality entertains passengers
Movie Camera

An in-car gaming system that creates an interactive game  
corresponding to a vehicle's real-world route could keep passengers  
entertained on long journeys, say Swedish computer scientists. It  
turns passing sights like forests, buildings and rivers into  
locations for in-game characters and events.

The Backseat Playground consists of a GPS receiver, a handheld  
computer and headphones, all connected to a laptop in the trunk of  
the car.

The laptop uses the GPS data to maintain a three-dimensional model  
that keeps the car correctly positioned within the virtual world. A  
database of geographical information is used to match events in the  
game to suitable locations. Players interact using the handheld  
computer.

The game begins with a radio newsflash, relayed by the handheld  
computer, which places a passenger at the start of a murder mystery  
or a werewolf thriller. As the car travels along its route, the  
player receives further phone calls and walkie-talkie messages from  
characters in the game.
Like a novel

Although the game is largely audio-based it can easily draw players  
in, says John Bichard, who created Backseat Playground with  
colleagues Liselott Brunnberg and Oskar Juhlin at The Interactive  
Institute in Stockholm, Sweden.

"It's like a novel," Bichard explains. "We are trying to suggest  
spaces and places and events and have the user fill in the gaps to  
build a narrative."

A video explains the system and shows two children testing out a  
prototype (13MB, MP4 format). For now, the game only works over an  
area of 35 square kilometres in Stockholm.

"We are doing an evaluation of the prototype at the moment to test  
how people respond to the game," Bichard says. Initial feedback has  
been positive, and the team would like to add voice recognition to  
the set-up. "Being able to talk directly to the characters would be  
great," he says.

"This is a very interesting way to deliver content," says Rob Aspin,  
a researcher from the Centre for Virtual Environments at the  
University of Salford, UK. "It can create a high sense of presence  
and interaction while hiding most of the technology from the user."

Aspin adds that attempts to implement analogous visual systems using  
augmented reality (see 'Augmented reality' glasses tackle tunnel  
vision) have been hampered by the fact the resolution of GPS tracking  
is limited to around a metre. "Objects appear to drift, which is very  
disorientating to the user," Aspin says, though he believes this  
could be solved in the future.


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