> > But in order for that to happen they'd have to be attached to something, > Only if you care about getting momentum right. If you push against a wall, feel

> > But in order for that to happen they'd have to be attached to something, > Only if you care about getting momentum right. If you push against a wall, feel pressure on your hand, and your viewpoint moves away from the wall, then (apart from the motion sickness) that's a pretty good wall simulator. In theory, you could get a bit more resistance than just the tactile feeling of pressure by bracing against the user's body in some fashion, but mechanically that might be hard to accomplish without what amounts to a wearable robot arm automagically interposing surfaces wherever you are supposed to feel them (and of course it would fail fairly dramatically as soon as you tried to lean against a wall or a tree).