# Augumented Reality

> *"A digital layer placed over the physical world in a way that allows you to still be present." - Meta*

Types of AR

* on Browser - WebAR
* on Mobile App
* on Social Media

1968 - Sword of Damocles by Ivan Sutherland

SLAM - Simultaneous Localization and Mapping

process by which technologies like smartphones, robots analyze, understand and orient themselves around the world.

requires data collecting hardware like cameras, gyroscope, depth sensors

## Types of Tracking in AR

<table data-full-width="false"><thead><tr><th>Outside-in tracking</th><th>Inside-out tracking</th></tr></thead><tbody><tr><td>uses external cameras or sensors to detect motion and track positioning.</td><td>uses cameras or sensors located within the device itself to track its position in the real world space.</td></tr><tr><td>Less Portable</td><td>More Portable</td></tr><tr><td>HTC Vive (VR headset)</td><td>Microsoft HoloLens (AR headset)<br>Google Pixel (AR mobile)</td></tr></tbody></table>

## The similarities and differences between AR and VR

* The most obvious difference is in the hardware itself.&#x20;
  * A VR experience must be viewed in some kind of headset, whether it’s powered by a smartphone or connected to a high-end PC.&#x20;
    * VR headsets require powerful, low-latency displays capable of projecting complete digital worlds without dropping a frame.&#x20;
  * AR technology does not share this requirement. You can hold up your phone and have a headset-free AR experience any time.

Augmented reality is direct or indirect live view of a physical, real-world environment whose elements are "augmented" by computer-generated perceptual information.&#x20;

Virtual reality is the use of computer technology to create a simulated environment, placing the user inside an experience.

Both technologies enable us to experience computing more like we experience the real world; they make computing work more like we do in regular life-- in a 3D space.&#x20;

In terms of how the two technologies are used, think of it like this.&#x20;

* VR transports you to a new experience. You don’t just get to see a place, you feel what it’s like to be there.&#x20;
* AR brings computing into your world, letting you interact with digital objects and information in your environment.