UI click events in Studio

🧑‍💻 Technical Support
1

I’m working with 2D (overlay) UI in Studio, using them as buttons to control my character. But I haven’t found a good way to detect whether they’re being touched.

Is there any way to handle events like touch start, touch move, or touch end for 2D UI?

I noticed that things like ecs.input.SCREEN_TOUCH_START don’t work on 2D UI elements, even though they do work on 3D UI.

But I need my buttons to stay in fixed positions on the screen, so using 2D UI is kind of essential for me.

here is my test project :

2

I can see how this can be confusing! The SCREEN_TOUCH_START event fires a Raycast under the hood which only applies to 3D elements. 2D UI doesn’t exist in the 3D scene so the Raycaster will never be able to hit it. You’ll have to use the ‘click’ event from vanilla Javascript to register touch or click events on 2D UI. You can see this used in our sample projects as well, however I’ll let the engineering team know this can be confusing.