Subgoal Graphs for Eight-Neighbor Gridworlds

نویسندگان

  • Tansel Uras
  • Sven Koenig
  • Carlos Hernández
چکیده

We propose a method for preprocessing an eightneighbor gridworld to generate a subgoal graph and a method for using this subgoal graph to find shortest paths faster than A*, by first finding high-level paths through subgoals and then shortest low-level paths between consecutive subgoals on the high-level path.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Subgoal Graphs for Optimal Pathfinding in Eight-Neighbor Grids

Grids are often used to represent maps in video games. In this paper, we propose a method for preprocessing eightneighbor grids to generate subgoal graphs and show how subgoal graphs can be used to find shortest paths fast. We place subgoals at the corners of obstacles (similar to visibility graphs) and add those edges between subgoals that are necessary for finding shortest paths, while ensuri...

متن کامل

Speeding-Up Any-Angle Path-Planning on Grids

Simple Subgoal Graphs are constructed from grids by placing subgoals at the corners of obstacles and connecting them. They are analogous to visibility graphs for continuous terrain but have fewer edges and can be used to quickly find shortest paths on grids. The vertices of a Simple Subgoal Graph can be partitioned into different levels to create N-Level Subgoal Graphs, which can be used to fin...

متن کامل

Feasibility Study: Subgoal Graphs on State Lattices

Search using subgoal graphs is a recent preprocessing-based path-planning algorithm that can find shortest paths on 8neighbor grids several orders of magnitude faster than A*, while requiring little preprocessing time and memory overhead. In this paper, we first generalize the ideas behind subgoal graphs to a framework that can be specialized to different types of environments (represented as w...

متن کامل

Additive Heuristic for Four-Connected Gridworlds

Memory-based heuristic techniques have been used to effectively reduce search times in implicit graphs. Recently, these techniques have been applied to improving search times in explicit graphs. This paper presents a new memory-based, additive heuristic that can be used on a type of explicit graph: the four-connected gridworld. The heuristic reduces the number of expanded nodes by up to five ti...

متن کامل

Gridworlds as Testbeds for Planning with Incomplete Information

Gridworlds are popular testbeds for planning with incomplete information but not much is known about their properties. We study a fundamental planning problem, localization, to investigate whether gridworlds make good testbeds for planning with incomplete information. We find empirically that greedy planning methods that interleave planning and plan execution can localize robots very quickly on...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2012