Three-dimensional intersection detection algorithm based on space scanning strategy

Abstract

The invention discloses a three-dimensional intersection detection algorithm based on a space scanning strategy. In the algorithm, the states of space objects in a scene are divided into a dead state, an activated state and a dormant state in the moving process of a virtual scanning plane on the basis of subdivision characteristics of space scanning, and intersection calculation is only performed to the space objects in the activated state; thus, the relation between the space objects in front and back subdivisions of a virtual scanning trace in the detection process can be fully used to optimize the detection process, reduce a large amount of unnecessary intersection detection of the space objects in the scene, greatly improve the algorithm efficiency while solving the problem of the instantaneity of the intersection detection in a complex scene containing a large amount of data.

Description

technical field [0001] The present invention relates to the fields of computer graphics, computational geometry, CAD / CAM, GIS, VLSI layout, linear programming, and pattern recognition, and specifically relates to the grouping of spatial objects based on the idea of ​​red and blue, the creation of event points, the construction of event point lists, and spatial scanning Surface creation and movement, intersection test of active space objects, etc. Background technique [0002] In recent years, scholars at home and abroad have done a lot of research on how to improve the efficiency of intersection detection, and proposed effective detection methods such as space division method and hierarchical bounding box method. In practical applications, Ganter and Isarankura proposed a space decomposition method, which divides the space containing geometric objects into a series of subspaces, and only performs intersection detection in the overlapping subspaces of two geometric objects, w...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the inefficiency of the existing intersection detection algorithm when dealing with massive 3D GIS spatial data, a spatial scanning strategy is proposed by referring to the 2D planar scanning technology, and then a 3D intersection detection algorithm based on the spatial scanning strategy is proposed -SweepPlane, this algorithm not only greatly improves the efficiency of the algorithm, but also solves the real-time problem of intersection detection in complex scenes with large amounts of data

This algorithm makes full use of the connection between spatial objects in the partitions before and after the virtual scanning trajectory in the detection process, optimizes the detection process, reduces a large number of unnecessary intersection detections between various spatial objects in the scene, and greatly improves the algorithm efficiency. At the same time, it also solves the real-time problem of intersection detection in complex scenes with large amounts of data

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