skew - concatenate skew

m.skew(fAngle, vFrom, vTo);

fAngle - skewing angle in radians

-

Concatenates skew transformation into the matrix. Skew transformation is defined in space defined by two vectors 'vFrom' and 'vTo'. Note: the skewing angle must satisfy the following constraints:

-PI/2 < angle < PI/2

.

// skewing space is x - y plane