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NonAffine, Affine (default), contains NoShear, contains NoScaling that allows significant speed improvements. If you like it, this concept could be applied to Transform::extractRotation (or to a more advanced decomposition function) and to Hyperplane::transformed() and maybe to some other places... e.g., I think a Transform::normalMatrix() function would not harm and warn user that the transformation of normals is not that trivial (I saw this mistake much too often)