| 基于模板阴影体算法的矢量数据在三维场景中的绘制 |
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| 引用本文： | 刘昭华,杨靖宇,戴晨光.基于模板阴影体算法的矢量数据在三维场景中的绘制[J].测绘工程,2009,18(1):38-41. |
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| 作者姓名： | 刘昭华 杨靖宇 戴晨光 |
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| 作者单位： | 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 |
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| 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。南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。
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| 关 键 词： | 模板测试 阴影体 矢量数据多面体 矢量数据绘制 |
Rendering vector data over 3D terrain based on stencil shadow volume algorithm |
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| LIU Zhao-hua,YANG Jing-yu,DAI Chen-guang.Rendering vector data over 3D terrain based on stencil shadow volume algorithm[J].Engineering of Surveying and Mapping,2009,18(1):38-41. |
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| Authors: | LIU Zhao-hua YANG Jing-yu DAI Chen-guang |
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| Institution: | LIU Zhao-hua , YANG Jing-yu, DAI Chen-guang(1. Faculty of Architecture and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000,China; 2. Institute of Surveying and Mapping, Information Engineering University, Zhengzhou,450052,China) |
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| Abstract: | 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. |
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| Keywords: | stencil test shadow： vector data polyhedron vector data render |
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