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Qiu H.,University of Electronic Science and Technology of China | Qiu H.,University of Nottingham | Qiu H.,Provincial Key Laboratory of Digital Meida | Chen L.-T.,University of Electronic Science and Technology of China | And 2 more authors.
WSEAS Transactions on Computers | Year: 2013

Grass animation plays an important role in various applications, such as virtual reality, computer games and special effects of movies. In recent years, varieties of approaches have been proposed to simulate the interaction between grass and the wind field. However, simulation of grass-object interaction is seldom involved due to the complexity of physical interaction and the high computational cost. In this paper, we present a novel method to animate realistic interaction between grass and dynamic objects. The representation of large-scale grassland relies on three different levels of detail that could reduce the rendering cost and still allow high-fidelity rendering of grasses close to the viewer. According to different levels of detail, two animation approaches are applied: physically-based method, which deals with the deformation of geometricalbased grass blades that close to the viewer; procedural method, which handles billboard-based grass. Besides, seamless dynamic transition between different levels is taken into account. Experiments demonstrate our method not only can realistically simulate the interaction between massive amounts of grass and the dynamic object, but also can overcome the deficiencies of existing approaches. Source


Qiu H.,University of Electronic Science and Technology of China | Qiu H.,University of Nottingham | Qiu H.,Provincial Key Laboratory of Digital Meida | Chen L.-T.,University of Electronic Science and Technology of China | And 5 more authors.
WSEAS Transactions on Signal Processing | Year: 2014

Radar plays an important role in many domains, such as target searching, target tracking and dynamic objects detection. However, the electromagnetic information of radar is invisible and full of changes in real time, which restricts users to plan and design the radar systems. In recent years, with the development of interactive visualization technology, 3D visualization of the abstract information of radar coverage under the influence of complicated environment becomes a hotspot. In this paper, we present a method to represent radar coverage considering the electromagnetic interference. Based on the radar equation, from the perspectives of pitch and azimuth angles to achieve 3D modeling of radar coverage through discrete subdivision, and the radar model possesses self-adaptability to different levels of detail. The 3D radar detection range under the influence of electromagnetic interference is analyzed and addressed based on radar jamming model. Experiments demonstrate that our method not only can efficiently complete the three-dimensional modeling of radar, but also visually show the true radar coverage under the influence of complex electromagnetic environment. Source

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