This is the second of my three-part look into symmetry reduction algorithms for speeding up grid-based pathfinding. In part one I introduced the notion of path symmetry: a property of uniform-cost grid maps which can significantly slow down optimal search. In this article I discuss Rectangular Symmetry Reduction (RSR for short): a new pre-processing algorithm […]| Shortest Path
In this article, the first in a three-part series, I attempt to explain path symmetry: a property of uniform-cost grid maps and other regular search domains which can significantly slow down pathfinding. I describe how symmetry manifests itself and briefly discuss some approaches that other people have tried to improve things. Finally, I introduce two […]| Shortest Path
This is the final article in my three-part look at symmetry reduction algorithms for speeding up pathfinding on uniform-cost grid maps. Recapping the story so far: Part one introduces the notion of…| Shortest Path