基于模板阴影体算法的矢量数据在三维场景中的绘制  

Rendering vector data over 3D terrain based on stencil shadow volume algorithm

作　　者：刘昭华[1] 杨靖宇[2] 戴晨光[2] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000 [2]信息工程大学测绘学院,河南郑州450052

出　　处：《测绘工程》2009年第1期38-41,共4页Engineering of Surveying and Mapping

摘　　要：提出一种基于模板阴影体算法的矢量数据绘制方法,实现矢量数据在三维场景中的高质量实时叠加显示。由于该方法基于屏幕空间,所以具有像素级的精度,不会出现传统的基于纹理方法所产生的绘制走样现象;而且不受地形几何数据的约束,其执行效率与地形数据的复杂度无关,仅取决于矢量数据本身的复杂度。详细论述基于模板阴影体算法矢量数据绘制的关键技术,并通过试验验证该方法的有效性。A method of rendering vector data over 3D terrain based on the stencil shadow volume algorithm is presented. And high-quality real-time overlay of vector data is allowed on virtual landscapes. Since this method is a screen-space algorithm, it is per-pixel exact and does not suffer from aliasing artifacts like texture-based techniques, In addition, since the method is independent of the underlying terrain geometry, its performance does not depend on the complexity of the ta. The key technique of vector data render based on experiments. data set but only on the complexity of the vector dastencil shadow volume is discussed and is proved by experiments.

关 键 词：模板测试 阴影体 矢量数据多面体 矢量数据绘制 

分 类 号：P391[天文地球—地球物理学]