How to level out the camera after breaking a tether

[elbarto1980]

Hi,
I have a question about how to restore the correct behavior of the EarthManipulator after having tethered it to a node, using the TETHER_CENTER_AND_ROTATION mode.
When I break the tether using the clearViewpoint() method, the camera is left in a weird state and it is not controllable. To restore its correct behavior, I have to change the tether mode to TETHER_CENTER, wait for the camera to be "realigned" and only then I can break the tether.

I saw in the the EarthManipulator.cpp file that it does that here, but I can't figure out how to do that in my code, outside the EarthManipulator class.

You can reproduce the issue using the osgeart_manip demo application if you break the tether when the TETHER_CENTER_AND_ROTATION mode is active.

What is the best way to restore the manipulator when this happens?

Thank you for your help!

P.S.: These are my caps...

[osgEarth]  [Registry] Note: GDAL_DATA environment variable is not set
[osgEarth]  [Capabilities] Capabilities: 
[osgEarth]  [Capabilities]   osgEarth Version:  3.2.0 build 113
[osgEarth]  [Capabilities]   OSG Version:       3.6.5
[osgEarth]  [Capabilities]   GDAL Version:      3.0.4
[osgEarth]  [Capabilities]   GEOS Version:      3.8.0
[osgEarth]  [Capabilities]   GPU Vendor:        NVIDIA Corporation
[osgEarth]  [Capabilities]   GPU Renderer:      NVIDIA GeForce RTX 3070 Laptop GPU/PCIe/SSE2
[osgEarth]  [Capabilities]   GL/Driver Version: 4.6.0 NVIDIA 535.129.03
[osgEarth]  [Capabilities]   GL Core Profile:   no

[gwaldron]

We probably need to add that same re-alignment code whenever a tether breaks. I will convert this to an Issue. Thanks.

[elbarto1980]

Thank you!
Actually, there is a resetLookAt() in the clearViewpoint() method, but it is commented out.
In the meantime, I have been able to mitigate the issue by setting a viewpoint that has a focalpoint in earthManipulator->centerMap() and a range equal to viewer->getCamera()->getViewport()->height(), after the clearViewpoint().