As a result of the emerging nature of our field and to respect personal opinions, you will see some of the latest terms (such as XR, eXtended Reality, and X) being used almost interchangeably throughout the book based on author preference and the topic at hand in each chapter. Debate over terminology continues as standards are developed. Each author uses terminology that accords to their own perspectives and beliefs. You can find definitions in each chapter.
Why We Wrote This Book
This book was conceptualized during a time shortly after Clay Bavor, VP of Virtual Reality (VR) at Google, noted in his keynote at Google I/O in 2017 that the future creators and consumers of technology will imagine in new world humans experience technology where the eye can enable anyone to go anywhere or bring anything to the end user with an instant gesture or voice command. We are at the forefront of spatial computing. Spatial computing here is used interchangeablly to describe various modes of the virtuality continuum to include terms in this book that switch between virtual reality (VR), augmented reality (AR), mixed reality, and eXtended reality (XR), as referenced by Paul Milgram and Fumio Kishino’s 1994 book A Taxonomy of Mixed Reality Visual Displays.
Figure P-1. Paul Milgram and Fumio Kishino conceived of the reality continuum concept in the mid-1990s to describe ...
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