Furthermore, most VR controllers nowadays
are able to provide haptic feedback through vibration.
So, what does this haptic feedback through vibration mean?
In real life, when I put this mug on the table
I will feel a small vibration the moment the mug touches the table.
This can be supported by the controller in VR.
Because we have the position tracking of the wand, the system knows where the mug
is moving in a 3D space, and it knows the 3D position of the table.
So when these two overlap with each other in the 3D space, at the moment the mug
touches the table, the system can detect it and make the controller
generate a small vibration to resonate with what I expect to feel in real life.
This gives a very strong sense of immersion.
This illusion is so
strong, I have seen various cases of people who after spending some time in VR,
putting virtual objects on a table that doesn't really exist, were so convinced
subconsciously that there was a table, they would lean against it and fall.
For myself, there were a few times I almost left the VR controllers on
the virtual table because I forgot that it didn't really exist.
Fortunately, I have never dropped and broken one so far.
Another point I would like to mention is that when our uses try to move around
using the joystick and touchpad, which is something we call virtual navigation,
it's more likely someone would feel nausea in the HMDs than in the cave.
So you are encouraged to find other ways to navigate the 3D space rather than just
importing a first person controller normally designed for a 2D user interface.
Again, we will talk more about this later in this course.
Finally, when it comes to mobile VR systems,
only some of them come with a controller.
But the position of the controller is not normally tracked for
the same reason we discussed with hat tracking.
Also, they don't usually have built-in mechanisms to provide vibration feedback.
Google Daydream comes with a controller,
with a touchpad which provides rotation tracking.
Samsung Gear VR hs a touchpad on the right hand side of the HMD.
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