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.. _naming-conventions:
====================
Naming conventions
====================
In the code, we try to abbreviate common concepts in a standard way.
* *aff* - 4 x 4 :term:`affine matrix` for operating on homogenous coordinates
of shape (4,) or (4, N);
* *mat* - 3 x 3 transformation matrix for operating on non-homogenous
coordinate vectors of shape (3,) or (3, N). A :term:`rotation matrix` is an
example of a transformation matrix;
* *euler* - :term:`euler angles` - sequence of three scalars giving rotations
about defined axes;
* *axangle* - :term:`axis angle` - axis (vector) and angle (scalar) giving
axis around which to rotate and angle of rotation;
* *quat* - :term:`quaternion` - shape (4,);
* *rfnorm* : reflection in plane defined by normal (vector) and optional point
(vector);
* *zfdir* : zooms encoded by factor (scalar) and direction (vector);
* *striu* : shears encoded by vector giving triangular portion above diagonal
of N x N array (for ND transformation);
* *sadn* : shears encoded by angle scalar, direction vector, normal vector
(with optional point vector).
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