OOF2: The Manual
Bunge (Bunge) — Bunge angles for defining a rotation which operates on the lab axes, bringing them into coincidence with the crystal axes, in the order z, x, z.
- First rotation, about z axis, in degrees. Type: A real number in the range [-180, 180].
- Second rotation, about x axis, in degrees. Type: A real number in the range [0, 180].
- Third rotation, about z axis, in degrees. Type: A real number in the range [-180, 180].
Bunge object represents the orientation
of a three dimensional object, assumed to be a crystal, in three
dimensional space in terms of three angles,
corresponding to rotations which
bring the lab (or screen) axes
coincidence with the crystalline
respectively. This is the conventional usage of the texture
community, and is the opposite of the usual
sense for rotations in OOF2.
With this important difference, it resembles the X convention, in that the axis selection and ordering are the same. The rotation is about the initial laboratory axis , the second rotation is about the rotated laboratory axis, and the third rotation is about the rotated axis.
The OOF2 implementation of this method actually constructs the
usual OOF2 rotation matrix (which takes the crystalline axes
into the laboratory axes), but does so from the conventionally
specified Bunge parameters. Users familiar with the
Bunge convention can thus use previously
obtained or instrument provided angles directly.