An unmanned aerial vehicle(UAV)is a small,fast aircraft with many useful features.It is widely used in military reconnaissance,aerial photography,searches,and other fields;it also has very good practical-application a...An unmanned aerial vehicle(UAV)is a small,fast aircraft with many useful features.It is widely used in military reconnaissance,aerial photography,searches,and other fields;it also has very good practical-application and development prospects.Since the UAV’s flight orientation is easily changeable,its orientation and flight path are difficult to control,leading to its high damage rate.Therefore,UAV flight-control technology has become the focus of attention.This study focuses on simulating a UAV’s flight and orientation control,and detecting collisions between a UAV and objects in a complex virtual environment.The proportional-integral-derivative control algorithm is used to control the orientation and position of the UAV in a virtual environment.A version of the bounding-box method that combines a grid with a k-dimensional tree is adopted in this paper,to improve the system performance and accelerate the collision-detection process.This provides a practical method for future studies on UAV flight position and orientation control,collision detection,etc.展开更多
Rendering of large-scale forest scenes is a challenging task,whose highly geometric complexity will put heavy burden on current graphics hardware.When navigating the scene,the overall visual result is generally consid...Rendering of large-scale forest scenes is a challenging task,whose highly geometric complexity will put heavy burden on current graphics hardware.When navigating the scene,the overall visual result is generally considered as the core concern.A new method is proposed in this paper for large-scale forest rendering using clustering and merging strategies.Our method improves the rendering effect by clustering polygons according to the point information with relation to neighbours.A fast forest rendering system is developed accordingly.The relative techniques in the system can improve the visual quality on demand of different applications.展开更多
In recent years, image-based anti-aliasing techniques have been widely investigated in real-time computer graphics. Compared to traditional routine of anti-aliasing, image-based methods, which combined with deferred s...In recent years, image-based anti-aliasing techniques have been widely investigated in real-time computer graphics. Compared to traditional routine of anti-aliasing, image-based methods, which combined with deferred shading, can efficiently decouple anti-aliasing step from standard graphics pipeline. However, most of the existing image-based methods consume video memory, bandwidth and computation resources heavily. In this paper, we propose an optimized anti-aliasing method, which can efficiently reduce the multi-sampling rate by a multi-sampling mask. We carefully designed the rendering system to avoid serial execution on branch divergence, by utilizing both modern GPU's features and latest shader model. Experimental results demonstrate that our method can achieve high-quality synthesized image with real-time performance.展开更多
基金This work was supported by the National Key Technology Research and Development Program of China(Nos.2015BAK01B06,2017YFB1002705,2017YFB1002601,and 2017YFB0203002)the National Marine Public Service Project(No.201505014-3)+1 种基金the National Natural Science Foundation of China(NSFC)(Nos.61472010 and 61661146002)the Equipment Development Project(No.315050501).
文摘An unmanned aerial vehicle(UAV)is a small,fast aircraft with many useful features.It is widely used in military reconnaissance,aerial photography,searches,and other fields;it also has very good practical-application and development prospects.Since the UAV’s flight orientation is easily changeable,its orientation and flight path are difficult to control,leading to its high damage rate.Therefore,UAV flight-control technology has become the focus of attention.This study focuses on simulating a UAV’s flight and orientation control,and detecting collisions between a UAV and objects in a complex virtual environment.The proportional-integral-derivative control algorithm is used to control the orientation and position of the UAV in a virtual environment.A version of the bounding-box method that combines a grid with a k-dimensional tree is adopted in this paper,to improve the system performance and accelerate the collision-detection process.This provides a practical method for future studies on UAV flight position and orientation control,collision detection,etc.
基金Supported by National Natural Science Foundation of China(61421062,61472010)National Key Technology R&D Program of China(2015BAK01B06)
文摘Rendering of large-scale forest scenes is a challenging task,whose highly geometric complexity will put heavy burden on current graphics hardware.When navigating the scene,the overall visual result is generally considered as the core concern.A new method is proposed in this paper for large-scale forest rendering using clustering and merging strategies.Our method improves the rendering effect by clustering polygons according to the point information with relation to neighbours.A fast forest rendering system is developed accordingly.The relative techniques in the system can improve the visual quality on demand of different applications.
基金Supported by National Natural Science Foundation of China(NSFC)(61232014,61421062,61472010)National Key Technology R&D Program of China(2015BAK01B06)+1 种基金National Marine Public Service Project(201505014)Equipment Development Project(315050501)
文摘In recent years, image-based anti-aliasing techniques have been widely investigated in real-time computer graphics. Compared to traditional routine of anti-aliasing, image-based methods, which combined with deferred shading, can efficiently decouple anti-aliasing step from standard graphics pipeline. However, most of the existing image-based methods consume video memory, bandwidth and computation resources heavily. In this paper, we propose an optimized anti-aliasing method, which can efficiently reduce the multi-sampling rate by a multi-sampling mask. We carefully designed the rendering system to avoid serial execution on branch divergence, by utilizing both modern GPU's features and latest shader model. Experimental results demonstrate that our method can achieve high-quality synthesized image with real-time performance.