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一种大曲率线状实体的三维可视化方法

DOI: 10.6046/gtzyyg.2014.03.07, PP. 43-47

Keywords: 3D-GIS,线状模型,三维可视化,大曲率线状实体

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Abstract:

线状模型是虚拟三维场景中的重要模型,其精细程度直接影响着虚拟场景的视觉效果。制作线状模型的常用方法分为整体模型法和分段拼接法,对于弯曲程度较大的线状模型,使用整体模型法制作时难以控制顶点坐标和纹理贴图,而采用分段拼接法又会在转弯处产生模型空隙和纹理重叠,导致模型失真。该文提出了一种针对大曲率线状实体的三维可视化方法,在几何模型制作阶段,根据路径和截面数据直接计算模型顶点坐标、法向量和索引数据,实现放样建模;在纹理贴图阶段,通过建立模型顶点与纹理图片像素的映射关系,实现模型贴图。结果表明,该算法可应用于铁路路基等大曲率线状模型的制作,具有精度可靠、人工交互少及可视化效果好的特点。

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