Shulou(Shulou.com)06/03 Report--

This article introduces you to the example analysis of the implementation principle in VR, the content is very detailed, interested friends can refer to it, I hope it can help you.

VR:Virtual Reality

The official introduction is as follows:

VR is the abbreviation of Virtual Reality. In Chinese, VR means virtual reality (real illusion, spiritual realm, illusion), also known as spiritual realm technology or artificial environment. The concept was developed in the early 1980s and specifically refers to a new means of "human-computer interaction" created with the help of computers and the latest "sensor" technology. Virtual reality is the use of computer simulation to generate a three-dimensional virtual world, providing users with visual, auditory, tactile and other sensory simulation, so that users as immersive as in general, can timely, unrestricted observation of things in the three-dimensional space.

From the definition point of view is relatively advanced, yesterday checked the implementation principle, did not find any very high technical content, so a brief introduction:

There are three basic elements to achieving a basic visual VR environment through a mobile phone.

1, Glasses 2, Gyro (with sensor) 3, 3D rendering engine

The following are introduced:

1, first, the user wears a pair of glasses, two lenses are convex lenses, mainly focusing (to prevent too close to see, because the phone will be closer to the glasses);

2. The picture in the mobile phone is virtual by the 3D graphics engine. The principle of this picture is as follows:

The 3d engine simulates a world in virtual 3d space, and assumes that the observer is located at a certain point in the world, while giving a direction (usually directly in front), and then renders the virtual scene in front of him through perspective projection onto a plane.

3. When the user moves his head, the gyroscope will detect the movement component and pass it to the rendering engine. The rendering engine adjusts the perspective of the virtual observer and re-renders the new scene.

4, that is to say, if the above process is fast enough, because the 3D virtual world is simulated in advance, the observer moves his head left and right, and the virtual scene he sees corresponds to the scene he sees when he shakes left and right in that virtual world. In this way, he feels that he is in a virtual world.(In fact, the picture in front of him switches rapidly according to its actions, just like we use the mouse to pull the horizontal scroll wheel.)

5. In addition to this, there is also a difference in the pictures seen by the left eye and the right eye in the real world because of the positional deviation. vr takes this into account and plays different pictures for the two eyes.

At the rendering engine level, it is easy to implement, as long as two virtual observation points are assumed, and the odd frames are viewed by the left eye and the even frames are viewed by the right eye at the same time, and the odd and even frames are played differently.

At this point, a basic visual VR technology has been realized. As for sound, there is obviously no difference between the implementation mechanism and ordinary PC sound. It can be seen that VR technology is relatively simple at least from the principle level.

About the VR implementation principle of the example analysis shared here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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