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Member Since 05 May 2013
Offline Last Active Aug 18 2014 04:32 PM

#5059819 A* pathfinding around axis-aligned rectangle obstacles

Posted by warisson on 06 May 2013 - 02:25 PM

Hmm, it certainly sounds like I can reduce the running time by calculating connections while pathfinding rather than before, as you guys said.

Perhaps I should have mentioned some more details: the player character walks around a 2D area with rectangle obstacles that don't move (or rather, very few obstacles are able to move around, and they're always player-sized or smaller, so if we collide with something, we can just run the pathfinding again). The reason why I said that the rectangles move around a lot is that the player can only see a certain area of the map (which is huge), and because the player is constantly moving whenever it paths around, rectangles move around, get placed in the area of sight, fall out of the area of sight, etc, all the time. However, while pathfinding, they're definitely mostly stationary. The player is the only agent that needs to pathfind. Also, when I pathfind, I'm only looking to go from the starting point to wherever I want to go to, no more. The environment to path in is typically medium-sized (I know that's a poor description but I'm not sure how else to explain it). Also, the rectangle obstacles are allowed to overlap each other, which I hope will not affect the algorithm (at least, it doesn't seem to me like it should affect a great deal).

There's also something else I should have added. Sometimes, it's not possible to find a path from A to B (ie, when B is inside an obstacle or enclosed by rectangle obstacles). Would I have to search through all points, then?