Why is my 2D Unity AI agent's Z position fluctuating when using a pathfinding package?

Other Questions AI Agent
1

I’m developing a 2D game in Unity and I’ve integrated a popular pathfinding package. The AI agents are moving and avoiding obstacles as expected, but there’s a weird issue with their Z position.

My setup is as follows:

  • The AI agent prefab has a transform position of (0,0,0)
  • The spawn point and destination both have a Z value of 0
  • The path waypoints all seem to have a Z position of 0

However, as the AI agent moves along the path, its Z position keeps changing between -9 and -1. I haven’t tweaked any of the package’s code and followed the 2D setup instructions carefully.

I’ve double-checked the Pathfinder and Grid Graph settings, as well as the AI Agent, spawn point, and destination object configurations. Everything looks correct, but the Z position issue persists.

Has anyone encountered this problem before? Any suggestions on how to keep the AI agent’s Z position consistent at 0 throughout its movement? I’m stumped and would really appreciate some help!

2

I’ve encountered a similar issue in my 2D Unity projects. The fluctuating Z position is often caused by the pathfinding algorithm trying to optimize the path in 3D space, even when you’re using a 2D setup.

Here’s what worked for me:

First, check your AI agent’s Rigidbody2D component (if you’re using one) and ensure that the ‘Freeze Position Z’ option is enabled. This helps to restrict any unintended Z-axis movements.

If that doesn’t work, consider modifying the pathfinding update to enforce a constant Z value by setting transform.position = new Vector3(newPos.x, newPos.y, 0f) each frame. This ensures only X and Y values change.

Lastly, verify your camera configuration, since an improper setup might create an illusion of Z-axis fluctuation. Hope this helps!

3

I’ve faced this issue before, and it can be quite frustrating. One solution that worked for me was to implement a custom script that overrides the AI agent’s position update. In the script, you can intercept the new position calculated by the pathfinding package and force the Z value to always be 0.

Here’s a quick example of what the script might look like:

void LateUpdate()
{
    Vector3 currentPos = transform.position;
    transform.position = new Vector3(currentPos.x, currentPos.y, 0f);
}

This ensures that regardless of what the pathfinding algorithm does, your agent stays firmly on the 2D plane. Just attach this script to your AI agent prefab, and it should solve the Z-axis fluctuation problem without interfering with the pathfinding logic.