Capture Frame Rate Drops Significantly When Stylus is Out of NDI Tracker's Field of View

[wyshmily]

I’ve encountered an issue while using fcal for recording.

When the stylus is within the tracker's field of view, the recording works as expected, with a frame rate close to the requested value of 30 FPS.

However, when the stylus is outside the tracker's field of view, the recorded frame rate drops significantly to around 3 FPS.

Is this the intended behavior, or could there be an issue on my end? Thank you for looking into this!

I believe the issue is likely related to the vtkPlusNDITracker class. When a Tool type DataSource is configured in the configuration file, and this Tool is actually outside the NDI tracker's field of view, the frame rate for acquiring localization data in vtkPlusNDITracker drops significantly.

Is there any API or configration to fix this behavior ？