virtual reality

wht dont we have vitural reality i went to see the movie 2012 this weekend and was amazed at the special effects if we can create special effects on computers that realistic why cant we make a virtual relaity like we have the wii but i want a helmet that i can put on and play a video game in a virtual relity like we have motion capture and unbeliavable computer animation like this movie avatar i saw a preview for that and the computer animation in it was sooooo realistic i might have believed it wasnt animation if i didnt already know soooo whyno virtual reality get on it nintendo