Mixed Reality (MR)
Introduction
Mixed reality (MR), also sometimes called hybrid reality, is the combination of virtual reality and augmented reality. This combination allows us to create new spaces in which both real and virtual objects and/or people interact. That is, it can be considered a mix between reality, augmented reality, augmented virtuality and virtual reality. In a more explanatory way, we would say that it tries to transfer the real world to the virtual world, creating a 3D model of reality and overlaying virtual information on it, linking the two realities to be able to combine extra content of value for the mixed reality user.[2].
Definition
In 1994, Paul Milgram and Fumio Kishino defined the concept of mixed reality as a subset of technologies related to virtual reality that involves the fusion of the real and virtual worlds somewhere along the continuum of virtuality. This continuum of virtuality extends from the completely real world to the completely virtual environment, with augmented reality and virtual reality falling in between. That is, mixed reality not only allows the user to interact with the virtual environment but also allows physical objects in the user's immediate environment to serve as elements of interaction with the virtual environment.[4].
Another name that is also used to refer to mixed reality is "fused reality").[5].
Characteristics
Virtual reality is possible thanks to the application of stereoscopic techniques. During childhood, human beings develop stereoscopic vision, which allows them to see three-dimensional images by integrating the 2 images obtained from each of the eyes through the brain. That is, each eye captures the image separately and the brain interprets it as a single image, producing the effect of three-dimensionality.[4].
It recognizes the volumetry of our environment in order to place virtual objects on the already existing environment, knowing how to apply the occlusion of opaque bodies with a realism never seen until today.[6] Use some artificial reinforcements to create a virtual or augmented reality environment. For example, if the user turns their head, the system responds with an appropriate change in the scene.[7] Mixed reality allows the incorporation of computer-generated graphic objects into a three-dimensional real-world scene or the incorporation of real objects into a virtual world.