Visual Error Elimination Method of 2D Vector Solid Line in 3D Scene

Abstract

The invention discloses a visual error elimination method of a two-dimensional vector solid line in a three-dimensional scene, which mainly solves the intermittent disappearance phenomenon caused by the thin vector solid line existing in the process of fitting and rendering the two-dimensional linear symbol to the three-dimensional terrain surface, vector The aliasing and aliasing phenomenon of the solid line boundary, the phenomenon that the width of the vector solid line does not change with the zoom of the scene, etc. It includes the following main steps: according to the width of the vector solid line, it is planarized; using the projection inversion method to calculate the coverage of screen pixels in two-dimensional space; according to the spatial position relationship between the pixel's two-dimensional space coverage and the vector solid line area Classify the pixels, and perform multi-sampling processing on the part of the pixels that intersect with the area boundary of the vector solid line; judge whether the sampling point is inside the area of ​​the vector solid line, determine the coloring of the sampling point according to the judgment result, and use the sampling point The color blend value replaces the screen color buffer value for the corresponding pixel.

Description

Technical field [0001] The present invention relates to the technical fields of computer applications, computer graphics and geographic information, in particular to an algorithm that reduces or eliminates the visual error and distortion of a two-dimensional vector solid line in a three-dimensional scene during the rendering process. On the basis of the accuracy and rigor of the expression of the mutual topological relationship between the three-dimensional surface, the visual perception of the users of the three-dimensional geographic information system is improved, and the selective abstraction of the geographic phenomenon of the map symbols in the three-dimensional scene is enhanced. The key information content is more accurate and prominent. Background technique [0002] Proposed by Mikael Vaaraniemi et al. in 2011 in "High-Quality Cartographic Roads on High-Resolution DEMs" (high-quality road symbol rendering based on high-resolution DEM), the fitting rendering algorithm of ...

AI Technical Summary

Problems solved by technology

However, the width of the vector line used by this method does not change in real time with the zoom of the scene. It is suitable for the map vector line with a fixed line width, but it is not suitable for expressing the vector line whose line width changes according to the zoom of the scene, and there is aliasing at the edge of the vector element phenomenon is not resolved

In addition, there is still room for performance improvement in the parallel heterogeneous computing mode based on CPU-GPU cooperation

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