We present a new meshing algorithm for the plane, Overlay Stitch Meshing (OSM), accepting as input an arbitrary Planar Straight Line Graph and producing a triangulation with all angles smaller than $170^\circ$. The output triangulation has competitive size with any optimal size mesh having equally bounded largest angle. The competitive ratio is $O(\log(L/s))$ where $L$ and $s$ are respectively the largest and smallest features in the input. OSM runs in $O(n \log (L/s) + m)$ time/work where $n$ is the input size and $m$ is the output size. The algorithm first uses Sparse Voronoi Refinement to compute a quality overlay mesh of the input points alone. This triangulation is then combined with the input edges to give the final mesh.

@inproceedings{miller07size,
  Author = {Gary L. Miller and Todd Phillips and Donald R. Sheehy},
  Booktitle = {34th International Colloquium on Automata, Languages and Programming},
  Title = {Size Competitive Meshing without Large Angles},
  Pages = {655--666},
  Year = {2007}}