Jump to content
  • Advertisement
Sign in to follow this  
Polydone

Excluding vertices from polygonal roadmap - for pathfinding

This topic is 1162 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I've been playing with pathfinding using A* using a polygonal map. (One bounding polygon with polygonal obstacles)

For this I created a roadmap, connecting all reflex vertices with each other if they had visibility using an r*n*log(n) angular scan algorithm (n*log(n) per reflex vertex)

Then I discovered that not all of these reflex-reflex lines are actually needed. Consider the edge r1-r2 line, if r1 has visibility of both sides of r2 (not necessarily the previous or next vertex) or vice versa, then the line would never be part of a shortest path (except of course the shortest path from r1 to r2 or from r2 to r1).

Quite a few reflex edges can be omitted this way, reducing the size of the roadmap.

 

I wonder if anyone else is doing this?

 

Example, all reflex edges are in red, but only the necessary interconnections have been added to the roadmap:

Edited by Polydone

Share this post


Link to post
Share on other sites
Advertisement
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!