Next: , Previous: Transform Data Members, Up: Transform Reference


19.2 Global Variables and Constants

— Variable: Transform user_transform

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.

— Constant: const Transform INVALID_TRANSFORM

Every member of matrix in INVALID_TRANSFORM is equal to INVALID_REAL.

— Constant: const Transform IDENTITY_TRANSFORM

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.