Parallel Computing for 3D Delaunay Triangulation of Non-Uniform Cloud Points

Year 2024, Volume: 7 Issue: 2, 71 - 85

Zahida Tchantchane , Mohamed Bey Khadidja Bouhadja

Abstract

3D acquisition technologies have favored the development of geometric modelling of 3D objects based on data from their digitization. The aim is to use the Delaunay triangulation (DT) approach to generate a digital model of the external surfaces of a physical object from point clouds. The generation of a DT from a non-uniform point clouds is an arduous and time-consuming task. Moreover, point clouds are very large and computationally intensive, which increases processing time and costs, especially if only one processor is used. The fastest DT algorithm is based on the divide-and-conquer, which is generally designed to be used for parallelism. This algorithm is carried out in two steps. The first step recursively partitions the points set into sub-regions; each is assigned to a processor. Independently, these regions are further triangulated simultaneously. The second step merges the sub-regions into the final mesh, which is applied in the reverse order of points set partitioning. This work deals with the generation of a 3D triangulation from any point cloud, which is partitioned to several sub-points using cells. Independently, the sub points are further triangulated simultaneously by parallelizing the calculations on several processors. After that, an allocated area of each cell is determined, as well as the strategy for the fusion. Finally, this solution is tested and validated through many unstructured point clouds.

Keywords

Cloud of Points, Cells, 3D Delaunay Triangulation, Merging, Parallel Computing

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