XR Camera Rigs Explained

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TRANSCRIPT

The XR camera Rig. XR meaning extended reality that is the continuum between augmented reality and virtual reality is a very important concept that will help you develop these types of applications. Let's start with the very basics. A camera in Unity and other three-D engines is simply a device that captures and displays what's happening in the game world to your user. In normal three-D applications users can control the camera by using the mouse, the keyboard or sometimes the application itself controls the camera. For example, in an ending sequence. That is an important difference with how things work in virtual reality and also in augmented reality. The user is in control of where the camera is looking at and in fact if there's also position tracking they are also in control of the position of the camera or at least the relative position of the camera from a certain origin, so you can not impose those things on your user in these types of applications. Also, in virtual reality you actually have two cameras in the game one for each eye. Luckily for us when working in Unity you normally just work with one camera and the other two cameras are created during runtime, so an important type of extended reality applications are stationary experiences. This is where the position of the camera is being fixed and you have control of over the rotation and also we have room scale experiences which is where the whole space is being tracked and the position of the floor is known and you can move around. Now this definition there's no standard because I've seen different ways of talking about the same concepts. I have seen definition of stationary experiences where there is a little bit of movement as well, although the position of the floor is not known. A common setup in Unity is that you would develop you would create an empty object called the XR camera Rig and then you would place your camera and if you have hand truck controllers you would place those as well. If you are on a stationary experience you have to give those a certain height from the floor. If you are on a room scale experience the height is given by the tracking. What if you go into a vehicle? I said before that you cannot force the movement or the rotation of the user. Well, you can if you think of in reality now nobody can force you to look at a certain direction and nobody can force you to move, but if you go into a vehicle the vehicle can move, so what you do is you put the whole camera rig inside of the vehicle or inside of the elevator or the aircraft and then that vehicle can indeed move and it can indeed rotate it, but the user is still ... https://www.youtube.com/watch?v=GomAiW1E2_4