Fig. 3
From: Review of heterogeneous material objects modeling in additive manufacturing
a Triangulation produced by the Delaunay refinement algorithm with minimum angle ≈20° [35]. b Based on a minimum angle ≈ 33°, the left mesh is formed by always splitting the worst existing triangle, and the right mesh is formed by using a first-come first-split queue of bad triangles [36]. c Based on a domain with many holes, refined meshes can be progressively generated around points of interest [37]. d 3D unstructured grids generated by the advancing-front method [38]. e The finite element mesh of a circle generated via quadtree representation, [39]. f Automatic 3D mesh generation by the modified-octree technique [40]