Parallel fitting rendering method of vector solid line and 3D terrain

Abstract

The invention discloses a parallel lamination rendering method of a two-dimensional vector solid line and a three-dimensional terrain surface, and the method is characterized in that the display space of the two-dimensional vector solid line is expanded from a two-dimensional plane to a three-dimensional irregular face, such that a three-dimensional geographic information system has the expressing ability of concrete reality and abstract space rule. In comparison with the existing technology, based on a projection back calculation method from screen space to two-dimensional space, the method can effectively eliminate the phenomenon of suspension, puncture and interruption of the vector line on the three-dimensional terrain surface without depending on the used terrain model, the method has high rendering precision and the rendering performance is promoted by a parallel calculating method. The method comprises the following steps of: eliminating pixels without shading adjustment; creating space indexes for the vector solid line; calculating the space coverage range of the screen pixel by the space projection back calculation method and judging whether the pixels are intersected with the two-dimensional vector, if so, modifying the pixel shading; generating the line width effect to the vector; generating the color gradient effect of the vector along sight distance change.

Description

technical field [0001] The present invention relates to the technical fields of computer application, computer graphics and geographic information, and in particular to a parallel rendering method for a two-dimensional vector solid line on a three-dimensional terrain surface. The two-dimensional vector solid line can be rendered on a three-dimensional terrain surface, and the two The display space of the three-dimensional vector solid line expands from the two-dimensional plane to the three-dimensional irregular surface, so that the three-dimensional geographic information system has both the realistic expression of the terrain and the abstract expression ability of the linear space law, and enhances its readability in the interactive process sex. Background technique [0002] In "High-Quality Cartographic Roads on High-Resolution DEMs" (High-Quality Cartographic Roads on High-Resolution DEMs) proposed by Mikael Vaaraniemi et al. Divided into three categories: texture-mappi...

AI Technical Summary

Problems solved by technology

This method has limitations on the rendering of solid line elements with a width of 1 pixel, and the algorithm needs to draw the polyhedron formed by vector expansion twice, which will greatly affect the real-time display of data

If the depth value in the 3D scene varies greatly, the width of the vector line in the distance will be significantly different from the position close to the viewpoint.

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