Google has always believed in the power of immersive virtual reality, but to create the most realistic sense of presence, the content displayed in VR needs to be as close as possible to what it sees.
The light field is an advanced capture, stitching and rendering algorithm. By generating motion parallax and very realistic textures and illumination for statically captured images, the light field can provide you with a very high quality presence. In order to demonstrate the potential of this technology, Google recently officially released the free application "Welcome to Light Fields" on Steam, supporting HTC Vive, Oculus Rift and WMR heads.
Google's light field technology
Capture and process light fieldsFor the light field, nearby objects seem to be quite close to you. When you move your head, they will look very different. There are fewer changes in distant objects, and different objects emit different light, so you will get a strong hint that you are in 3D space. When browsing through VR heads that support location tracking, the light field can achieve a truly stunning VR experience based on clips captured in the real world.
The reason for this is that the light field can record all the different rays entering the space. To record them, Google adapted a GoPro Odyssey Jump camera platform that was bent into a vertical arc of 16 lenses and mounted on a rotating platform.
Left: Time-lapse video of a spherical light field taken on the deck of the Space Shuttle Discovery.
Right: Light field rendering allows us to sample and interpolate the light recorded by the lens and synthesize a new scene view anywhere in the spherical space.
It takes approximately 1 minute for the camera platform to rotate and record approximately 1000 outward viewing angles on a 70 cm sphere. This provides a two foot wide amount of light, which determines the size of the headspace, which is the space the user turns to explore the scene. To render the view to the head, Google samples the light from the camera position on the surface of the sphere, constructing a new view from inside the sphere and matching the way the user moves the head. They are aligned and compressed in a custom dataset file. According to Xiaobian, Google reads this dataset file through special rendering software as a Unity game engine plugin.
Record the world with light fieldGoogle has chosen several special venues to test their light field camera platform. Google said that they love the lacquered teak and mahogany interiors of the Gamble House, the glossy ceramics and sparkles of the Mosaic TIle House, and the sunshine of St. Stephen's Church in Granada. Stained stained glass windows. Most importantly, the Smithsonian Institution's Aerospace Museum and 3D Digital Office allowed Google to enter NASA's Discovery spacecraft, providing us with an astronaut's perspective on this unopened flight deck. Finally, Google recorded a series of light fields and experimented with how eye contact can be applied to a 6-degree-of-freedom experience.
VR video is a bright technology for exploring the world. Although it's just an experiment, the light field shows us the level of realism that the VR experience can achieve.
The difference between VR video and panoramic video
What is the difference between VR video and panoramic video?
We use a picture to illustrate the difference between 360-degree panoramic video and VR video:
The panoramic video is well understood, which is different from the traditional viewing angle of traditional video, allowing people to watch 360 degrees freely. On the basis of this, VR video also allows people to freely move and watch in the video (providing a 360-degree free view of any position in the scene).
The panoramic video can be 3D or not, and can be viewed through the screen or with glasses. The VR video must be viewed with the head and must be 3D.
The panoramic video is played linearly, that is, played back according to the timeline. And VR video allows users to watch at different locations at the same time (somewhat like a sci-fi movie paused in time, then the viewer moves freely in the time and space of the freeze, watching the surrounding characters and scenery).
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