Self-adaptive grid subdivision method, device and equipment and storage medium

Abstract

The invention provides an adaptive grid subdivision method, device and equipment and a storage medium, and the method comprises the steps: reading a rough STL model, so as to obtain the vertex coordinate information and normal vector information of a triangular grid, and constructing the first index information of the vertex and surface of the triangular grid; traversing each triangular mesh according to the first index information to obtain an interpolation point of each edge in the triangular mesh; deleting redundant interpolation points and constructing a topological relation, and meanwhile, generating vertex coordinates of the subdivided grids and second index information of the surface; and obtaining the tangent layer contour of the subdivided grid and the entity contour of the original CAD model corresponding to the tangent layer contour, calculating the chord height difference between the tangent layer contour and the entity contour, taking the chord height difference as the judgment basis of the grid subdivision precision, and outputting second index information when the chord height difference is judged to be smaller than the threshold. The surface precision of the rough STL model can be rapidly improved, the subdivision frequency is controlled by judging the subdivision grid precision, and the method is simple, good in universality, high in practicability and good in application prospect.

Description

technical field [0001] The invention relates to the field of computer-aided geometric modeling, in particular to an adaptive grid subdivision method, device, equipment and storage medium. Background technique [0002] The STL file is a file format used in computer-aided design software for stereolithography, and has been widely used in fields such as additive manufacturing. The STL file uses multi-triangular patches to approximate the surface of the model to approximate the expression of the solid part. It is generally generated directly from the CAD model through software, and the output parameters (chord height, step length and angle tolerance) directly affect the quality of the model. Therefore, in this process There is a loss of model accuracy in . When the accuracy of the STL file is not high, it will have a negative impact on the quality of subsequent processing. In this case, the original STL model can be subdivided until the processing accuracy requirements are met....

AI Technical Summary

Problems solved by technology

This method is mainly to judge the area and the longest side of the triangular mesh, and decide whether the triangular mesh should be subdivided, but the area and side length of the triangular mesh cannot explain the accuracy of the subdivided mesh, so it cannot be effective Improving Surface Accuracy of Triangular Mesh

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