Boid Flocking and Pathfinding in Unity, Part 2

July 5th, 2012 by Anthony Capobianchi

In my last post, we worked through the steps to create a Boid system that will keep objects together in a coherent way, and a radar class that will allow the Boids to detect each other. Our next step is to figure out how to get these objects from point “A” to point “B”, by setting a destination point.

Pathfinding -

For this example, I used Aron Granberg’s A* Pathfinding Project to handle my pathfinding. It works great and uses Unity’s CharacterController to handle movement, which helps with this example. A link to download this library can be found at and a guide to help you set it up in your scene can be found here:

In Boid.cs I have my path finding scripts as such:

Applying the Forces -

Once we have the calculated force of the Boid behaviors and the path finder, we have to put those together and apply that to the character controller. We use Unity’s Update function on Boid.cs to constantly apply the forces.

In my next post, we will look at using a ray caster to set a destination point in the scene for the Boids, as well as how to organize a number of different destination points for the Boids to keep them from piling on top of each other.

Read part one here.

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