Implementation of a size field based isotropic hex core mesh algorithm

This paper introduces an isotropic hex core meshing scheme based on a scalar function size field defined by user-defined shape primitives, boundary meshes and/or solution adaptation cloud point data. Meshing starts with a small number of root voxel elements, which are then refined via an octree framework to the size field specification. Voxel elements are classified as either cutting, inside or outside of the prescribed surface mesh, resulting in sets of elements wholly outside the surface grid boundaries (external mode) and inside any defined outer boundaries (internal mode). Voxels are then converted to hex core (tet, pyramid and hex) form, processed and finally connected to isoptropic tet cells lying between hex core and surface grid regions. Examples of hex core meshes are provided.