Need help on Quaternion.lookAt (NaN output)

FishBoneEK

https://doc.qt.io/qt-6/qml-qtquick3d-quaternion.html#lookAt-method

For the following arguments:

Quaternion.lookAt(
  Qt.vector3d(0.47212299704551697, -0.05714830011129379, -0.03842129930853844), 
  Qt.vector3d(0.0174984410405159, -0.1452823281288147, -0.038421452045440674), 
  Qt.vector3d(-0.9816991090774536, -0.19043900072574615, 0), 
  Qt.vector3d(0, 1, 0)
)

The output is a NaN quaternion? What's the issue here?

My understanding is lookAt calculates the rotation of the forwardDirection vector of an obj at sourcePosition to the other obj at targetPosition, so that forward after rotation aligns to target - source, and tries to keep upDirection close to the positive Y axis. Is this correct?

Jonas Karlsson

After a quick glance at the Qt source code it seems like this is a bug so please feel free to report it.

FishBoneEK

@Jonas-Karlsson Thanks for the reply!
However I cannot file a bug report on the Bug Tracker (the "Create" button won't respond).
It would be nice if you would report it instead of me.

P.S. The bug in the bug tracker, pretty ironic?

Thanks!