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Learn ARCore - Fundamentals of Google ARCore

You're reading from   Learn ARCore - Fundamentals of Google ARCore Learn to build augmented reality apps for Android, Unity, and the web with Google ARCore 1.0

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788830409
Length 274 pages
Edition 1st Edition
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Author (1):
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Micheal Lanham Micheal Lanham
Author Profile Icon Micheal Lanham
Micheal Lanham
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Table of Contents (13) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. ARCore on Android 3. ARCore on Unity 4. ARCore on the Web 5. Real-World Motion Tracking 6. Understanding the Environment 7. Light Estimation 8. Recognizing the Environment 9. Blending Light for Architectural Design 10. Mixing in Mixed Reality 11. Performance Tips and Troubleshooting 12. Other Books You May Enjoy

Mapping, GIS, and GPS


Unity, as we already learned, tracks its objects in 3D space using a point with a Cartesian coordinate reference system of x, y, and z. When we plot a point on a map of the world, it is no different; we need to reference the point, except that now we need to use a spherical or geographic reference system to represent a position on the earth, because as we all know, the earth is spherical. However, converting between a geographic system and Cartesian system is expensive. Many mapping applications, therefore, use an intermediary reference known as earth-centeredearth-fixed (ECEF), which represents mapping data on an earth-fixed Cartesian coordinate reference system. The following is a diagram shows the differences between Cartesian, geographic, and ECEF coordinate reference systems:

Comparison of coordinate reference systems

Now, you may have already noticed that WRLD supports ECEF out of the box. As we mentioned, since ECEF is already in a Cartesian frame of reference...

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