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Global Variables and Constants

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 1
See Transforms.