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101 Feb 07, 2011 at 04:23

I have a situation where there are numerous objects that need to wander about on a 2D plane. The objects should avoid certain areas in the plane and should also eventually make their way toward a desired goal destination.

Where can I find resources that would help with implementing this type of behavior?

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167 Feb 07, 2011 at 04:37

First of all, google for “pathfinding” and in particular “A* search”, which is very handy anytime you need things to move around and avoid obstacles.

If you want things to wander randomly, you could try an approach like: pick a random point within a certain radius (excluding points in obstacles) and path to it. When you get there, pick another random point and repeat.

To make them gradually head toward a goal, every few iterations you could substitute the randomly chosen destination with the goal itself, but then only let them travel a short distance before re-randomizing the goal point. Depending on the obstacle geometry there’s no guarantee they wouldn’t get stuck in a steady state far from the goal, though.

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101 Feb 07, 2011 at 04:45

I have the basic wandering around in a random way figured out.

I have tried using Google to find something that would be useful, and have not run across anything. That is why I’m now posting to this forum.

I don’t think I need to resort to something as complicated as A* to solve this problem. I’m not interested in finding an optimal path from a source to destination.

I’m hoping to find something dealing with areas that can attract or repel as object move close to those areas.

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103 Feb 07, 2011 at 05:30

a* isnt complicated.

if you still dont want it, why not just weight their random movements towards the goal, and theyll get there eventually? is that what you want?

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101 Feb 07, 2011 at 13:20

What kind of wandering?

Independent, directed human-like “wandering” (say, people in a city each with their own objective), crowded path (like filing into a stadium), or like a flock of birds (chaotic “follow the leader”)?

This may help:

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101 Feb 08, 2011 at 03:50

They are supposed to be zombies wandering around in a court yard and slowly making their way into building.

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141 Feb 08, 2011 at 05:18

You could pick random directions that have to more or less point toward the door and shift them in random amounts of time. You would need an avoidance system, though.

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101 Feb 08, 2011 at 12:25