The Pointer Problem

The Problem

I was working on a world space UI system for a Unity game project and needed a simple custom UI pointer. The goal was straightforward: allow players to interact with UI elements by looking at them and clicking, without needing to unlock or move the mouse.

With Unity’s older uGUI system, this would normally be pretty simple. You could create a custom raycaster, send pointer events manually, and be done. I figured UIToolkit would have an equivalent workflow.

It turns out, not quite. (or so I thought)

I searched around for examples of custom UIToolkit input handling and world space pointers, but I couldn’t find much that matched what I was trying to do. The closest example I found was Unity’s OpenXR input implementation, but that was much larger and more feature-rich than what I needed. I didn’t want to dig through an entire input system just to extract a small piece of functionality.

So, I decided to figure it out myself.

Part of the reason there wasn’t much information available is that this workflow is relatively new. UIToolkit world space UI support and the related input systems have only recently matured in newer Unity versions, meaning there simply aren’t years of examples and tutorials like there are for uGUI.

The Solution

After a lot of experimenting, debugging, and reading through UIToolkit’s documentation, I eventually got a simple custom pointer working exactly how I wanted.

The funny part? The final solution was much simpler than I expected.

The hardest part wasn’t actually writing the pointer logic. It was figuring out what Unity expected from custom input and which pieces of the UI event system were actually necessary. Different sources (and even some AI tools) suggested completely different approaches, which led me down a few unnecessary rabbit holes.

Eventually, I stopped trying to recreate larger systems and focused on the basics:

• How does UIToolkit receive pointer events?
• What does the panel need in order to process them?
• What information does the pointer actually need to provide?

Once I understood those pieces, the implementation became much smaller. The biggest issue ended up being something surprisingly simple: I was missing an assignment to a target reference that went along with the pointer event.

After all the investigation, debugging, and complexity I had built up in my head, the final fix was a small configuration change. There was some other needed exploration for how to enable UIToolkit to work in my specific case, but the rest was found out in time with a little more patience.

Conclusion

This was a good reminder that unfamiliar systems often feel more complicated than they actually are.

Because I couldn’t find a clear example of someone doing exactly what I needed, I assumed the solution must involve a complicated solution beyond my current understanding. I started looking into larger and more complex solutions before fully understanding the tools already available.

In the end, the answer was much closer to the surface. Reading the documentation carefully, inspecting the API, and understanding the actual problem I needed to solve was more valuable than adding more complexity.

Sometimes the hardest part of solving a technical problem isn’t the code - it’s knowing when to stop making the problem harder than it needs to be.