Now mobile VR is no longer as dazed and disgusting as it used to be. Of course, we still cannot achieve the same quality as the Oculus Rift and the PSVR. But technology is rapidly developing, which allows us to cut off annoying cables. But the boom in mobile VR has brought us new thinking about the 6-degrees of freedom in the virtual world.
Being able to walk freely in space (with certain restrictions) makes the HTC Vive the most attractive system on the market today, but the location tracking used may not be suitable for everyone. Oculus offers similar functionality, but they are working on an inside-out tracking that requires no cables to provide more mobility. In fact, we have already experienced the Santa Cruz prototype at last year's OC3 conference.
You may have heard about inside-out and outside-in. You may even know what they mean. But what are the specific advantages and disadvantages of the two? What kind of tracking method will we use in the next 10 years?
1. Outside-In
If you have tried the "Big Three" system (Oculus Rift, HTC Vive and PSVR), you have already experienced outside-in tracking. Headlights and accessories are tracked by external devices. The Vive is tracked through the Steam locator, while the Oculus Rift is tracked with a microphone-like sensor, similar to the Oculus system.
In the three settings, the sensors need to be placed in different locations in the room and then the heads are identified relative to the environment. Although this is very common in high-end systems, some mobile VRs also track solutions outside the experiment.
advantage
Outer-inside solutions remain fixed and are currently the most accurate systems. You can also add more trackers in your room to increase accuracy.
· The current outbound delay is lower, which will reduce your chance of motion sickness. Unless other solutions can achieve similar tracking quality, outbound tracking will continue to be the most powerful tracking solution. Therefore, this tracking scheme also has certain advantages for mobile VR.
Shortcomings
A major limitation is occlusion. If you suddenly go to the back of a sofa or a tall plant and stay away from the sight of the sensor, it will be difficult for the system to track your specific location. The sensor needs to effectively track you 360 degrees, otherwise the system will lose track of you.
· Another major problem is the limitations of sensors. Unlike internal tracking, you need to stay within the sensor's field of view. Once you are out of range, immersion will be broken. This problem will become even more pronounced if the VR setup space is limited.
2. Inside-Out
In this scenario, the device itself integrates a tracker that can detect changes in the device's position relative to the external environment. When the head moves, the sensor re-adjusts the coordinates of the location in the room, giving the impression that you are moving in real time in the virtual environment. Tracking inside or out can use markers or no markers. Although heads like Neo CV can let you use it freely, you can also review the pictures in the Valve demo room. In order to assist in the internal and external tracking, they covered many blank marks on the walls.
There are already companies offering attractive internal tracking solutions, including Qualcomm’s 835 reference heads. Eonite also demonstrated their inward and outward solutions. They attached a sensor to the HTC Vive headphone. Although the headphone still needed a cable to connect to the computer, we were free to walk in the virtual world without any external sensors. The best known is Microsoft. HoloLens and upcoming Windows Hybrid Reality Headsets will integrate inbound and outbound tracking, including Acer's "mixed reality" heads-up display.
advantage
· Freedom! With internal tracking, you will not be limited to a play space. Mobility will increase, and virtual reality will feel more real.
· For augmented reality and mixed reality, inbound and outbound tracking will become crucial because we need the system to provide more mobility.
Shortcomings
· Accuracy and delay. Tracking in and out requires good computer vision, but this technology is currently lagging behind inbound tracking but is now approaching the target.
· The head display must complete all calculation tasks, so the performance requirements of the equipment are very high.
3. The future
Completely accurate inward and outward tracking is the holy grail of all "reality." After all, when you explore a vast universe in virtual reality, who wants to suddenly hit a computer desk?
Anshel Sag, VR analyst at Moore Insights & Strategy, said: “I think we only see the presence of outbound tracking in high-end desktop PCs, and it is very likely that we The last solution."
"I believe we will see new tracking solutions that can speed up internal and external tracking, but it has not yet emerged. Ultimately, technologies such as VR and AR will be integrated, and there are many reasons for the advantages of the built-in tracking solutions. Especially for AR, most of the reasons are related to mobility and power consumption, both of which are currently the pain points for most VR solutions that lack inbound and outbound tracking."
Perhaps future solutions do not require a leap in technology, but instead exploit human weaknesses. An interesting movement technique is called "redirect walking," which is based on the principle that humans cannot walk in a straight line. That's right, if you don't believe it, you can let your little partner cover your eyes and go forward. Then you will understand.
This means that it is possible to manipulate someone's trajectory and convince them that they are still in a straight line. Although it is a weakness in the real world, it can be an advantage of location tracking in the virtual world.
The following is an example of previously reported redirect walking. A circular arc with a radius of at least 22 meters is used to fool people. The user thinks he is always on the straight line. But the problem is that we need a large enough play space to make it work, but for position tracking, the “infinite corridor†is a technology worth exploring.
Although inward tracking has begun to emerge, such technologies as Daydream VR and Samsung Gear VR have not been used. But I believe that in the future, the future mobile head will be integrated to track outwards. This is the logical development direction of space tracking, especially considering the potential and requirements of AR. John Carmack released a tweet in 2014 saying that he is tracking in and out of the development, but because "everyone is skeptical about whether this is effective, don't expect too much." Now, the inner-outward tracking feels more like an inevitable result. the trend of.
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