Simulation of particle systems is time consuming. However many particle system applications require fast interactive animations. For example, simulation of physically realistic complex snow phenomena is very useful in training, education, and entertainment. In this paper, based on particles system and aerodynamics, we use computational, and behavioral simulation techniques to simulate snow behavior in a flight simulator in real time. At first, we have introduced the principle of particle. The second, this paper has discussed basic attributes of snow particle in detail, we further simplify the numerical calculations according to practically requires and give some new attribute to snow that use a circle shape and specific initializing position of snow. The third, we have given the basic steps to generate a particle system. The fourth, in order to strengthen the depth of field, we make the particle from several kinds areas that faced to our point of view. At last, we construct a new wind models to generate particles and control the behavior accordingly. The approach has been implemented and applied in a flight simulator.
Because of clear image, large angle of view and strong depth of field etc. advantages, the film negative press off-axis type virtual image display system has been used to flight simulator widely. At first, this paper has introduced the frame and principle of film negative press off-axis type virtual image display system in detail, the secondly, we have combine our practice works, deduced calculated formula about the face type of back project screen of film negative press off-axis type virtual image display system by using method of changing light axis. The third, this paper has discussed the key designing and making steps of sphere reflector, at the same time we have given the automatic control method of negative press of reflection mirror. At last, we have given the performance parameters of whole system. It was proved that the film negative press off-axis type virtual image display system have meet all requests of the visual scene of flight simulator by testing, and this system has such virtues that the visual point of the observer may move out of the light axis. Now it has been applied on the visual scene display system of the high performance simulator, the effect is well.
Computer Generation Image (CGI) system is main part of the flight simulator. Usually, the Image Generation Workstation to be used in CGI system is very expensive. This paper presents a low cost CGI system based on PC and we use it to develop a flight simulator, which has a 3 channels display system with wide field-of-view (horizontal 240°× vertical 60°). First, the paper discusses the architectural principles of CGI system and provides a CGI system based on PC. Second, a type of 3 channels display system is described. The display system is designed in folded flat screen using rear project curtain. Adjacent screen shapes a 100° corner and each channel provides 80°×60° field-of-view. Furthermore, some key technologies, such as image connection, channels synchronization and channels communication, are discussed in detail. At the end of paper, a flight simulator with 3 channels visual scene is described and it is successfully implemented in training pilot. PC-Based CGI system also can be applied to a lot of fields including multimedia commerce, medical media databases visualization, CAD/CAM, scientific computing visualization, and entertainment.