| 基于模板阴影体原理的3维矢量数据绘制算法 |
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| 作者单位： | 信息工程大学测绘学院 河南郑州450052 |
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| 摘 要： | 提出了一种基于模板阴影体原理的3维矢量数据绘制算法,实现了矢量数据在虚拟地形场景中的实时高质量叠加绘制。算法由矢量多面体创建、模板缓存掩模图像生成和矢量数据绘制3部分组成。理论和实践表明,该方案是一种具有像素级精度的基于屏幕空间的算法。它不仅能够有效克服基于纹理的矢量绘制方法所产生的走样现象,而且与地形数据的复杂度无关,因而具有较高的执行效率。
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| 关 键 词： | 模板缓存 阴影体 矢量数据 实时绘制 |
Algorithm for Rendering 3D Vector Data Using Stencil Shadow Volume |
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| Authors: | YAN Xiao-dong DAI Chen-guang YANG Jing-yu |
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| Abstract: | A rendering method that was based on the stencil shadow volume theory was presented,which allowed high-quality real-time overlay of vector data on virtual landscapes.The method included three steps which were the generation of the vector data polyhedra,creation of the mask in stencil buffer and the application of the mask to the scene to render the vector data.The research and experiment showed that our approach was a screen-space algorithm and was of pixel-level precision.Since it did not suffer from aliasing artifacts like texture-based techniques and independent of the complexity of the terrain data set,it achieved good performance for the rendering of 3D vector data. |
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| Keywords: | stencil buffer shadow volume vector data real-time rendering |
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