People obtain the shape, spatial position and speed of external objects through vision, which are obtained through human static, dynamic and physiological stereo depth cues. Static depth cues are mainly the position, occlusion relationship, size and sharpness of objects in space, which have been taken into account in the projection relationship of our three-dimensional shape. The motion and position changes caused by the motion of the object require the computer to calculate and process the image in real time. Only when the visual persistence time exceeds 30 seconds per second, the smooth and stable image can be obtained without Blinking appears. This is what our current general 3D animation requires and should achieve. But such three-dimensional graphics and animations are displayed in two dimensions on the screen, just as we look at objects with one eye, lacking the depth and three-dimensionality of the objects. Practice has shown that human binocular parallax plays a decisive role in the depth perception of objects. To achieve the stereoscopic effect of a natural object, you must look at the object with "two eyes."
In an image in a computer virtual environment, the images of the two eyes of the person must be separately calculated and processed, correspondingly requiring separate image displays. Currently used helmet-mounted displays, but higher-resolution helmet-mounted displays cost more than $50,000. In the desktop virtual environment, a double image is displayed on an ordinary display or a binocular image is alternately displayed, and the image seen by both eyes is separated by the light valve glasses. Therefore, when the binocular image is alternately displayed, the frame rate of the display must be more than twice that of the normal display mode. Considering the delay of the light valve glasses, the frame rate is not less than 80 Hz.
Binocular split images require the computer to calculate and process images at 80 frames per second or more in real time. This real-time requirement is very high, so the workstation is used as the host. In game software on a microcomputer, the previous method used very low resolution and two-dimensional images. As the speed of the microcomputer increases, three-dimensional images can be used at present, but the resolution is still low. The high-end graphics accelerator card can greatly speed up the calculation, and can achieve 32bit color, 1600*1200 resolution, 4M Triangles/s and 100M pixel/s texture, which has made the virtual reality technology on the microcomputer platform enter the practical stage.
In terms of manufacturing technology, the requirements for sound are generally low. In virtual reality systems such as military real-time confrontation training, spatial stereo effects are necessary.
In the desktop virtual environment, the manipulators of human-computer interaction are mainly ordinary mouse, 6-degree-of-freedom mouse, data glove, and joystick. Data services, large projection domes, etc. are used in more sophisticated virtual reality systems.
The software and hardware prices of virtual reality systems are higher. For this reason, different systems can be configured according to different uses and needs, and the virtual environment with appropriate immersion depth will not make the system too complicated and the burden of cost and maintenance is too heavy. For example, a system for the design of an automobile shape focuses on displaying a high-quality stereoscopic image, and the requirements for hearing and touch are low, and it can be manipulated with an ordinary mouse, and the real-time performance is also not required. For example, in the part assembly simulation, in addition to the image, the maneuverability is high, and it can be equipped with a 6-degree-of-freedom mouse and data gloves. In virtual reality systems such as vehicles and aircraft simulation training, a wide field of view, real-time control system, and realistic sound effects are required. Not only must we respond quickly to people's steering signals, but we also need to simulate the tactile feedback of forces, displacements, etc.
2. Application of virtual reality system
The virtual reality system is first successfully applied in high-tech fields such as military and aerospace, as well as entertainment and roaming. For example: cockpit system for astronauts, pilot training, battlefield real-time drill system (virtual battlefield). Virtual reality systems also have important applications in product design and manufacturing processes, which can greatly improve the technical level of the products, such as the design of Boeing 777 aircraft, Ford's shape design and collision experiments, factory and building roaming. The current application effect is best in the following aspects:
Previous page next page
The Jigsaw is the wood working power tools, Perfect for cutting curve, hole digging,can cut 3cm circle.
Quick Clamp Chuck Portable Jig Saws With Laser is used for Cutting Wood, Plastic Tube, Aluminum Bar, with 6 speed 0-3000rpm, 4 Pendulum Settings, Bevel Cutting 45°, 20mm Stroke Distance, With Aluminum Base, and Laser Function.
No burrs with good blade.
Portable Jigsaw With variable speed, 0-3000rpm, for different material cutting.
The Jigsaw can cutting Capacity: Wood:80mm, steel:10mm
The Jig Saw with 4 Pendulum, 0 setting for metal, 1 setting for wood, 2-3 setting for soft wood.
Normal clamp chuck or quick clamping chuck is optional.
Iron base or Aluminum base is optional
Hand Jig Saw with a counterbalanced low-vibration plunge mechanism
Power Saw With a dust blower for max cut-line visibility.
Wood Cutting Power Tools with protection button for your safety, soft rubber handle for comfortable use.
The external laser function for better cutting line ability.
The Jig Saw is equipped with Guide ruler, to control the cutting width.
CE/GS/EMC/UKCA certificate.
Jig Saw,Cordless Jig Saw,Power Jig Saw,Power Jigsaw,Portable Jig Saw
Ningbo Brace Power Tools Co., Ltd , https://www.cnbrace.com