【作者】 王维翊；

【导师】 曹柳林；

【作者基本信息】 北京化工大学 ， 控制科学与工程， 2011， 硕士

【摘要】 虚拟植物生长(植物生长建模)研究是伴随着计算机科学、仿真科学及农林业科学等多个领域的发展而产生的一门交叉性学科。其主要研究目的和工作为：探索植物生长机理并在计算机中对该机理进行重建与仿真,从而进一步指导农林业及相关技术(地理信息系统、水土保持、沙漠化、数字城市等)的发展。在虚拟植物仿真中,光照的模拟是最重要的环节之一,除视觉效果模拟外,更重要的意义在于研究光照对植物生长过程的影响。本论文第一部分将计算机图形学全局光照理论、并行计算技术与虚拟植物生长相结合,探讨适合于虚拟植物的光照仿真模型及相应算法。该部分主要工作如下：1、研究辐射度算法及其在GPU上的并行实现；2、研究光子映射算法及其在GPU上的并行实现,并探讨其在三维虚拟植物上的应用；3、编写三维植物可视化及光照模拟软件wxVisualPlant。近年来多点触摸操控系统由于其高操作维度及更直观的操作模式,已成为人机交互的一个重要研究方向。在大尺寸交互平台(区别于手持设备)中,由于成本及可靠性等多方面原因,不适宜采用传统的电容式和电阻式多点触摸屏。本论文第二部分研发了基于红外光线、计算机视觉、图像处理等技术的多点触摸操控平台,并基于TUIO协议实现了该操控平台与虚拟现实软件的结合。该部分主要工作如下：1、研究并设计基于红外光的多点操控平台硬件及相关触摸识别系统；2、研发基于上述硬件平台及TUIO协议的控制驱动；3、该系统与虚拟现实应用的结合研究。更多还原

【Abstract】 The research of Virtual plants growth (plant growth modeling) is derived from computer science, simulation technology, agriculture and forestry science as an inter-discipline. The main research purpose is: exploring the inherent mechanism of plant growth, which is rebuilt and simulated on computers, then guide the further research of agriculture and forestry related technology (e.g., GIS, water and soil conservation, desertification and digital cities etc.). In the research of virtual plants, simulation of illumination is one of the most important elements, which has values not only in visual effects but also in exploring how it affects the growth of plants. The first part of this thesis synthesized the technology of global illumination theory, parallel computing and virtual plants growth and discussed proper lighting model and relevant algorithms.Main work of this part is as follows:1. Researched the Radiosity algorithm and realized it parallel on GPU;2. Researched the Photon Mapping algorithm and realized it parallel on GPU, then discussed its application on 3D virtual plants;3. Completed 3D virtual plants software-wxVisualPlant.Multi-touch systems are becoming an important research direction within recent years due to their higher manipulating dimension and more intuitional manipulating pattern. On large-scale platforms, traditional capacitor panels and resistance panels are not eligible owing to the costs and reliability. The second part of this thesis developed a novel multi-touch system based on IR lights, computer vision and image processing and then synthesis this platform with virtual reality applications, which is based on the TUIO protocol.Main work of this part is as follows:1. Researched and designed the IR-based multi-touch hardware and related touch recognition system;2. Developed control driver based on the system above and TUIO protocol;3. Researched the combination of multi-touch system & virtual reality applications.更多还原