Hi. I'm calling SliceNavigationController::ReorientSlices with the
following 2 vectors:

[0.112397, 0.435929, -0.892935]

and

[-0.865338 -0.398769 -0.30360146]

Their dot product is 0.0, so they are orthogonal, but the following message
is printed inside the ReorientSlices call:

WARNING: Invalid rotation matrix! R*R^T != ID. Max value: 1.08593e-08
(should be 0)

I have been looking for the mitk::eps constant, and I have found that it is
around 1e-14 (vnl eps is around 1e-16). In my case the error is
1e-08...maybe 1e-14 is too much to validate rotation matrices? What do you
think?

Thanks

Federico
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