[IGSTK-Developers] Tool orientation calibration

[David Gobbi]

Hi James,

I've taken a good look at igstkPrincipalAxisCalibration,
and it is exactly what we need for tracked pointers.

Defining both the "Initial" and "Desired" orientation is
a very good idea.

The class will have to be properly tested with an actual
tracker to make sure it is giving the correct results.

Are you still planning to add a "ReferenceCalibration" class,
for doing precise orientation calibration procedures for
tools like needles where the "point" isn't fixed?

 - David