Boundary linear smoothing method and device for three-dimensional geological lithologic grid model body drawing

Abstract

The invention provides a boundary linear smoothing method and device for three-dimensional geological lithologic grid model volume rendering. The method comprises the following steps: merging grids representing the same rock stratum attribute in the Z-axis direction in a three-dimensional geological lithologic grid model by using run length coding to obtain a plurality of rock stratum sections; taking each rock stratum section in the Z-axis direction as a vertical column, and connecting the starting points of the rock stratum sections with the spatial connection relationship in the vertical columns by using a straight line; a hexahedron is defined by rock stratum sections with a spatial connection relation in four adjacent vertical columns, and in the X-axis or Y-axis direction, according to the attribute relation of the rock stratum sections in the vertical columns to which two rock stratum sections in the side faces of the hexahedron belong, the segmentation mode of the side faces is determined. Combining the diagonal lines of the top surface and the bottom surface of the hexahedron to obtain a subdivision mode for dividing the hexahedron into tetrahedrons; a calculation template of rock stratum attributes of sampling points in the hexahedron is manufactured according to the subdivision mode; the rock stratum attributes of the sampling points are obtained through the calculation template, and the rock stratum attributes of all the positions of the hexahedron are determined.

Description

technical field [0001] The invention relates to the technical field of engineering geological structure modeling, in particular to a boundary linear smoothing method and device for volume rendering of a three-dimensional geological lithology grid model. Background technique [0002] Now, building a 3D geological structure model is an important content in urban 3D geological surveys. The 3D geological structure model can provide a basis for solving geological problems related to engineering activities by describing the fine lithology of the urban underground shallow geological structure and the geological environment of the engineering site. Sexual 3D data support. At present, the modeling methods of 3D geological structure models mainly use explicit modeling or implicit modeling methods to solve modeling problems with clear stratum structure characteristics, and use irregular triangulation to express the boundaries of geological objects. However, in engineering geology and ...

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Problems solved by technology

However, the lithology value is not only discontinuous, but also needs to ensure the rationality and consistency of superimposition according to the spatial position of the rock formation in the vertical direction. The position of the boundary point of the rock formation is generally not allowed to change, which makes trilinear interpolation and TriCubic interpolation unusable, while global space interpolation The method is not suitable for the real-time requirements of volume rendering

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