基于GPU投影网格的曲面渲染技术  

Surface Rendering Technology Based on GPU Projected Grid

作　　者：王志铭[1] 王旭[1] 杨新[1] 张璐 

机构地区：[1]上海交通大学图像处理与模式识别研究所,上海200240 [2]上海飞机制造有限公司,上海200436

出　　处：《计算机仿真》2010年第11期246-250,323,共6页Computer Simulation

基　　金：国家自然科学基金(60572154)

摘　　要：研究曲面渲染技术对船舶、汽车、飞机造型虚拟的设计飞行器飞行实时仿真系统设计尢为重要。为了克服传统的曲面渲染方法的不足和提高实时性,充分利用图形处理器(GPU)不断提高的渲染能力,包括GPU的可编程性和高度并行计算特性,在GPU上实现了投影网格(Projected Grid)的视点相关的曲面渲染技术。从视点发出的投射光线穿过投影网格后,将根据可视化细节的重要程度,自动生成具有不同细节层次(Levels of Detail)的曲面网格,并且实时地更新网格的细节层次需求。在整个渲染过程中保持稳定的帧率,生成与视点相关的曲面光滑流畅。试验证明满足了实时交互性的要求,在工程虚拟仿真领域有广泛的应用前景。Surface rendering technology plays an important role in virtual simulation of ship,vehicle and aircraft,especially for aircraft flight real-time simulation system.Surface rendering needs large amounts of mesh point data for calculation,which would impact the fluency of surface visualization.Therefore,reducing the amounts of mesh data and cutting down the computational burden to produce more faithful and fluent surface is a hot spot in computer graphics research.In order to overcome the deficiency of the traditional surface rendering methods,such as poor user interaction,large run-time computation cost,light aliasing,etc.,this paper proposes a view-dependent surface rendering technology based on Projected Grid implemented on Graphic Processing Unit（GPU）.This technique takes advantage of rapid increasing GPU rendering ability,including programmability and highly parallel computing ability of GPU,with all the computations of surface rendering executed on GPU.After drilling through Projected Grid,the projected rays from viewpoint produce surface mesh of different Levels of Detail（LOD） in an automatic way depending on the important degree of visualization detail and real-time update LOD of the mesh.The whole rendering process has steady frame rate,and generates view-dependent surface with smooth and natural image.Therefore,this rendering technology has good real-time user interaction,and is expected a broad application in engineering virtual simulation.

关 键 词：图形处理器 投影网格 曲面渲染 细节层次 视点相关 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]