Node: Transform Global Variables and Constants, Next: Transform Constructors, Previous: Transform Data Members, Up: Transform Reference
Transform user_transform  Variable 
Currently has no function. It is intended to be used for transforming
the coordinates of Points between the world coordinate system
(WCS) and a user coordinate system (UCS), when routines for managing
user coordinate systems are implemented.

const Transform INVALID_TRANSFORM

Constant 
Every member of matrix in INVALID_TRANSFORM is
equal to INVALID_REAL .

const Transform IDENTITY_TRANSFORM

Constant 
Homogeneous coordinates and Transforms are unchanged by
multiplication with IDENTITY_TRANSFORM .
matrix is an identity matrix:
1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1See Transforms. 