An efficient method for rendering linear symbols on 3D terrain using a shader language

An efficient method for rendering linear symbols on 3D terrain using a shader language
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使用着色器语言在 3D 地形上渲染线性符号的有效方法

DOI:
10.1080/13658816.2017.1394463
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发表时间:
2018-03
影响因子:
5.7
通讯作者:
Qiujun Wei
Qiujun Wei
中科院分区:
地球科学2区
文献类型:
--
作者:
Jiangfeng She;Chuang Li;Jiaqi Li;Qiujun Wei

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随着虚拟地理环境的广泛应用和三维可视化分析技术的迅速发展,复杂矢量线的绘制引起了人们的极大关注。虽然在三维地理信息系统(GIS)中有许多绘制算法,但它们都不够灵活,不能满足绘制由多种颜色和形状组成的线状符号的要求。然而,场景的交互式绘制和符号的准确性是大规模复杂矢量线的重要组成部分。本文提出了一种基于图形处理器(GPU)加速的三维地形线状符号绘制算法。符号渲染嵌入在地形渲染过程中,矢量线在3D纹理中编码,然后传输到GPU。在片段着色器的几何操作的帮助下,一组视觉属性被用来丰富符号的表达。实验结果表明,该方法可用于绘制各种像素精度的线状符号,并能达到实时绘制的效果。
With the extensive application of virtual geographic environments and the rapid development of 3D visualization analysis, the .rendering of complex vector lines has attracted significant attention. Although there are many rendering algorithms in 3D .geographic information system (GIS), they are not sufficiently flexible to meet the requirements for rendering linear symbols .composed of diverse colors and shapes. However, the interactive rendering of a scene and the accuracy of the symbols are .important components for large-scale, complex vector lines. In this paper, we propose a graphics processing unit (GPU)-accelerated .algorithm for rendering linear symbols on 3D terrain. Symbol rendering is embedded within the terrain-rendering process, and .vector lines are encoded in a 3D texture and then transferred to the GPU. A set of visual properties are used to enrich the expression.of symbols with the help of geometric operations in the fragment shader. A series of experiments demonstrate that the proposed .method can be utilized for drawing various pixel-exact linear symbols and can achieve real-time rendering efficiency.
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