A method for eliminating visual errors of two-dimensional vector solid lines in a three-dimensional scene

Abstract

The invention discloses a method for eliminating visual errors of two-dimensional vector solid lines in a three-dimensional scene, and mainly solves the problems that, in the process where a two-dimensional line symbol is fit and rendered to the surface of a three-dimensional terrain, intermittent disappear phenomenon, vector solid line boundary sawtooth deformation phenomenon, and the phenomenon that vector solid line width does not change with zooming of the scene and the like are caused for the reason that the vector solid lines are over-thin. The method comprises the following main steps: carrying out surface shape processing according to vector solid line width; calculating coverage area of screen pixels in the two-dimensional space by utilizing a projection back-calculation method; classifying the pixels according to the spatial position relation of two-dimensional space coverage area of the pixels and a vector solid line surface area, and carrying out multiple-sampling processing on the pixels which are in intersection relation with the surface area boundary of the vector solid lines; judging whether sampling points are in the surface area of the vector solid lines; and determining sampling points according to the judgment result and colouring the sampling points, and using the colour mixation values of the sampling points to replace the screen color cache values of the corresponding pixels.

Description

technical field [0001] The present invention relates to the technical fields of computer application, computer graphics and geographic information, in particular to an algorithm for reducing or eliminating visual errors and distortions of two-dimensional vector solid lines in three-dimensional scenes 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, it can improve the visual perception of the users of the three-dimensional geographic information system, enhance the selective abstraction and expression ability of the map symbols on the geographical phenomena in the three-dimensional scene, and make it want to convey The content of key information 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-Re...

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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