# More Modeling Transforms

#### It is possible to expand our repertoire of modeling transformations. We can
add Similitudes, Affines, and Projective groups of operators. However, most
of these are either not that useful in everyday practice, or they are commonly
reduced to one or two special cases, which generalize via a series of more typical
operations.

Among those transforms remaining, scales and shears are the most common:

### We can generate any 3-D affine transformation using a combination of a rotation,
a scale, a shear, and a translation.

##### shear [n.]

(§ Homonym: sheer)

1. A machine that cuts sheet metal by passing a blade through it.

2. (Physics) A deformation of an object in which parallel planes remain parallel
but are shifted in a direction parallel to themselves; "the shear changed
the quadrilateral into a parallelogram."

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