基于GPU和能量函数的快速精确的等值面重建算法  

RAPID AND ACCURATE ISOSURFACE RECONSTRUCTION BASED ON GPU AND ENERGY FUNCTION

作　　者：贾天奇[1] 刘会超[2] 郭希娟[2] 

机构地区：[1]燕山大学体育学院,河北秦皇岛066004 [2]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《计算机应用与软件》2012年第11期248-251,共4页Computer Applications and Software

摘　　要：Minkowski和算法能够精确地检测出若干子凸多面体之间是否发生碰撞,而凹多面体Minkowski和的边界只能用等值面来近似表示,等值面的生成通常需要计算数以百万计的体素,计算量比较大,耗时比较长,利用GPU的高速并行运算能力和浮点运算能力,加速等值面的形成,以达到实时生成等值面的效果。提出一种能量函数,在不改变原有结构的同时优化等值面,使其更接近实际形状,从而实现凹多面体实时的和高精度的碰撞检测。实验表明,提出的方法提高了等值面的绘制速度和绘制精度,从而提高了碰撞检测的精确性,尤其是在数据量比较大的情况下,效果更明显。Minkowski sum algorithm can accurately detect whether a collision happens among several sub-convex polyhedrons,but the boundary of Minkowski sum of non-convex polyhedron can only be expressed by isosurface approximately,the isosurface generation usually consist of millions of voxels,the computation quantity is quite big,and the computation time is quite long as well.In the paper,we use high-speed parallel computing ability and floating point computing ability of GPU to speed up the generation of isosurface in order to achieve real-time effect of isosurface generation.And a kind of energy function is raised,it can optimise the isosurface while the original structure is not changed,this makes it approximate more close to the actual shape,therefore realises the real-time and accurate collision detection of the non-convex polyhedron.Experiments show that the proposed algorithm enhances the rendering speed and the accuracy of isosurface,in particular,when the quantity of data is big,the effect seems more obvious.

关 键 词：Minkowski和 移动立方体 等值面 能量函数 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]