In addition to the visual perception of the general computer, there are auditory perception, tactile perception, motion perception, even taste, smell, perception, etc. The ideal virtual reality should have the perceptual function that everyone has.
Refers to the extent to which the user feels as the protagonist exists in the simulation environment. The ideal vr simulation environment should be to the extent that users can't tell the truth.
It refers to the degree of operation of the object in the simulation environment and the natural degree of feedback from the vr environment.
The degree to which objects in a virtual environment act according to the laws of the physical world.