OpenVR GetFocalPoint show big data

VR/AR
1

I have some problem,log as this.

function ResetCamera() ResetCameraClippingRange() before

vtkOpenVRRenderer GetActiveCamera()->GetFocalPoint() have value: 0.708148 , -0.260015 , -0.989036

function ResetCamera() ResetCameraClippingRange() after

vtkOpenVRRenderer GetActiveCamera()->GetFocalPoint() have value: 182.964 , 137.676 , 161.75

go to DoOneEvent event lop

DoOneEvent before
vtkOpenVRRenderer GetActiveCamera()->GetFocalPoint() have value: 182.964 , 137.676 , 161.75

DoOneEvent after: vtkOpenVRRenderer GetActiveCamera()->GetFocalPoint() have value: DoOneEvent 53526.3 , 10920.6 , -47488

why I get so big value?somebody know problem.

2

VTK9.0 run DoOneEvent show right value

vtkOpenVRRenderer GetActiveCamera()->GetFocalPoint() have value:

278.528 , -739.577 , 871.414
282.941 , -736.459 , 874.874
285.143 , -736.073 , 875.343
287.015 , -736.217 , 875.245