[Insight-users] RigidTransform vs AffineTransform?

[motes motes]

In the itkSoftwareGuide an examples is walked through using a
RigidTransform. But is a RigidTransform not just a centered AffineTransform?
I am a bit confused that a RigidTransform exists, as I understand rigid and
non-rigid are concepts that includes transforms. Something like:

Rigid:
 - Translation
 - Affine

Non-Rigid
 - BsplineDeformableTransform


Or are there something unique about a RigidTransform that is not
accomplished using eg. translation or Affine transforms?
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