I dont know what other games like, GTR, GPL, GTL, rfactor, etc have what LFS not have to work with TIR4 in 6DOF...
webcam + software can do basically the same, right, but it´s to slow and inaccurately...
Do you know how expensive some glasses with tracking are? Also I don´t think, that LFS supports this, when it doesn´t do it with tir4. 6 DOF are more than left/right, up/down...