InfiniteTrack example: generated meshes orientations not aligned

[geekrelief]

I've narrowed down the issue a bit.  Here's what the issue looks like  https://streamable.com/06fwn  Notice the unaligned meshes between generators.  The problem gets worse the longer it runs.  

Here I modified CurvySpline_private.cs:1109 

Code:

//Vector3 nextControlPointInitialUp = currentOrientationAnchor.getOrthoUp0INTERNAL();

Vector3 nextControlPointInitialUp = currentOrientationAnchor.ApproximationUp[currentOrientationAnchor.ApproximationUp.Length -1];

https://streamable.com/p2b0r  notice the meshes are now aligned but the ship and camera no longer rotate properly.

Update: Scratch my fix. That changes makes the CurvySplineSegment.ApproximationUp array all zero vectors.