With the maturity of VR technology, VR experience shops can be found in commercial plazas and pedestrian streets in major cities, and they are willing to go in to experience the thrill of VR and feel the technology of the times. During the experience, you will see a gyroscope on the VR glasses, so what is this gyroscope? What's the use? The following will answer this question for you.
In fact, this gyroscope may be owned by each of us, right on your mobile phone. A gyroscope is a kind of sensor that senses the dynamic changes in the position of the glasses. If the gyroscope is poor, that is to say, the response will be slower, then the delay will be more serious, the picture will freeze, and people will be dizzy. At present, there are at most nine-axis sensors, which are actually a combination of three sensors: a 3-axis acceleration sensor, a 3-axis gyroscope, and a 3-axis electronic compass (also called a geomagnetic sensor).
The acceleration sensor is used to measure acceleration in various directions in space. It uses the inertia of a "gravity block". When the sensor is in motion, the "gravity block" will generate pressure in the X, Y, and Z directions (forward, backward, left, and right). , And then use a piezoelectric crystal to convert this pressure into an electric signal. As the movement changes, the pressure in each direction is different, and the electric signal is also changing, so as to judge the acceleration direction and speed of the mobile phone. For example, if you suddenly push the phone forward, the sensor will know that you are accelerating forward.
A gyroscope is a device used to measure angles and maintain direction. In flying games, sports games, and first-view shooting games, it can completely monitor the player's hand displacement to achieve various game operation effects.
The electronic compass can basically describe the complete motion state of the device by operating the acceleration sensor and gyroscope. However, with long-term exercise, cumulative deviation will also occur, which cannot accurately describe the motion posture, such as the tilt of the control screen. The electronic compass (geomagnetic sensor) uses the measurement of the earth's magnetic field and corrects and compensates through the absolute pointing function, which can effectively solve the cumulative deviation, thereby correcting the human body's movement direction, posture angle, movement strength and speed.
Now the gyroscopes in mobile phones are very ordinary gyroscopes, and the effect is not up to the vr level requirements. Polar screen VR glasses have a very good nine-axis gyroscope built into the VR glasses, so the delay will be relatively low, the picture will not be stuck, and there will be almost no dizziness. The effect of VR glasses with built-in nine-axis gyroscope such as Polar Screen VR glasses will be much better than VR glasses without built-in gyroscope. This kind of VR glasses is more recommended.
In the VR scene, because it is necessary to simulate the position of some virtual objects in the scene after the head movement, it is necessary to obtain the position of the head relative to the world in real time. The head position in the figure has six parameters, three for rotation and three for a total of six degrees of freedom. The helmet posture that the nine-axis sensor can perceive, so as to output information to the virtual reality scene to build a head posture that is the same as the real world.
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