We present a hybrid mesh generation algorithm, which has been developed for semiconductor process and device simulation. The method uses Cartesian elements (bricks or hexahedra in 3D and rectangles in 2D) whenever possible and non-Cartesian elements (prisms and tetrahedra in 3D and triangles in 2D) are only introduced when necessary to resolve material boundaries or other features of interest. ...

The paper introduces a finite difference solver for the unsteady incompressible Navier-Stokes equations based on adaptive cartesian octree grids. The method extends a stable staggered grid finite difference scheme to the graded octree meshes. It is found that a straightforward extension is prone to produce spurious oscillatory velocity modes on the fine-to-coarse grids interfaces. A local linea...

In this paper we propose a new paradigm for encoding the geometry of dense point cloud sequences, where convolutional neural network (CNN), which estimates distributions, is optimized on several frames sequence to be compressed. We adopt lightweight CNN structures, perform training as part process and parameters are transmitted bitstream. The newly proposed scheme operates octree representation...

Abstract. 3D indoor mapping is becoming increasingly critical for a variety of applications such as path planning and navigation robots. In recent years, there growing interest in how low-cost sensors, monocular or depth cameras, can be used mapping. our paper, we present an octree-based approach real-time using handheld RGB camera. One benefit the generated octree map that it requires less sto...

An algorithm for the automatic construction of a 3 0 model of archaeological vessels is presented. In archeology the determination of the exact volume of arbitrary vessels is of importance since this provides information about the manufacturer and the usage of the vessel. To acquire the shape of objects with handles in 3d is complicated, since occlusions of the object’s su$ace are introduced by...

Space-Partition Octree (SP-Octree) is a hierarchical representation scheme for solid modelling. It allows a multiresolution representation of polyhedral objects, and has been successfully used in progressive transmission. Moreover, this scheme allows visualising the model in an adaptive way. However, at intermediate levels of the SPOctree, the obtained visualisation is a rough approximation of ...

Large scale ground motion simulation in realistic basins can benefit greatly from the use of parallel supercomputing systems in order to obtain reliable and useful results within reasonable elapsed time due to its large problem size. We present a parallel octree-based multiresolution finite element methodology for the elastodynamic wave propagation problem and develop a framework for large scal...

The finite element (FE) mesh sizing has great influence on computational time, memory usage, and accuracy of FE analysis. Based on a systematic in-depth study of the geometric complexity of a set of connected surfaces, a computational procedure for the generation of FE mesh sizing function is proposed. The computational procedure has three main steps: (1) Generation of source points that determ...

This lecture reviews the state of the art in quadrilateral and hexahedral mesh generation. Three lines of development – block decomposition, superposition and the dual method – are described. The refinement problem is discussed, and methods for octree-based meshing are presented.

A method combining an adaptive quad/octree spatial discretisation, geometrical Volume-OfFluid interface representation, balanced-force continuum-surface-force surface tension formulation and height-function curvature estimation is presented. The extension of these methods to the quad/octree discretisation allows adaptive variable resolution along the interface and is described in detail. The me...