In terms of Immersiveness, things like Headtracking and Positional Tracking are big contributors to the degree of Immersiveness that can be delivered.
There is however another element in VR which is of ciritical importance to the experience: Controllers & Haptical Devices. After all, you sometimes just need a controller to find your way in the Virtual World.
It’s good to make a clear distinction here between Controllers and the so called “Haptical devices”
Controllers that are now (or soon will be) available can be roughly divided in 2 groups:
- Conventional gamepads and controllers (like the Xbox One controller that is bundled with the Rift)
- Intuitive Tracking controllers like the Oculus Touch and the Steam VR controller.
We can give a long and detailed (boring) explanation on this but when thinking about Tracking controllers: Think Nintendo Wii and you get the picture.
Where a controller is limited to controlling an Avatar or a weapon, A Haptic Device takes it one step further.
Haptical basically means that “physical” feedback is given to a person, this feedback can be in the form of vibrations, movement or other means of noticeable action.
One example of Haptical Devices are the so called “Haptic Gloves” where the person wearing them is able to see its own hands in Virtual Space, little vibrating elements are creating the suggestion of actually touching objects.
If you want to take it even further: several companies are developing “Harnasses” and full body suits with haptical feedback in them, one of the examples here is the “Rapture Vest” from VR Themepark The Void.