Reason
When XRUIInputModule processes XRInput in DoProcess, it needs to obtain the camera screen position, and this camera is not the one on the Canvas, but Camera.main, which can be viewed in its parent class UIInputModule’s property uiCamera.
The method ProcessTrackedDevice of UIInputModule will call TryGetCamera, and if uiCamera cannot be found at that time, it will not execute and will not report an error.
Code snippet:
internal void ProcessTrackedDevice(ref TrackedDeviceModel deviceState, bool force = false)
{
...
if (TryGetCamera(eventData, out var screenPointCamera)) {...}
//no else
deviceState.OnFrameFinished();
}
If Camera.main is not null, but the transform of Camera.main is different from the canvas.worldCamera on the Canvas, it will cause a shift in the click position.
So the worldCamera of Canvas needs to be Camera.main.
If you encounter click offset or are unable to exit the UI controls normally, you can check the settings mentioned above
Suggestions
It’s all very normal, but when I wanted to rewrite the DoProcess() method of XRUIInputModule, I found that the access modifier of the readonly List<RegisteredInteractor> m_RegisteredInteractors it depends on is private, and its corresponding generic type is also private, which prevents me from accessing all the UIInteractors
I hope it can be changed to protected or internal later
Otherwise, I cannot choose the uiCamera based on the information from the interactor
Currently, I am solving it through partial
Others
I am not good at English, please understand