Node:Point Global Constants and Variables, Next:Point Constructors and Setting Functions, Previous:Point Typedefs and Utility Structures, Up:Point Reference
Point INVALID_POINT  Constant 
The x, y, and zvalues in world_coordinates are all INVALID_REAL .

Point origin  Constant 
The x, y, and zvalues in world_coordinates are all 0.

bool_point INVALID_BOOL_POINT  Constant 
b is false and pt is INVALID_POINT .

bool_point_pair INVALID_BOOL_POINT_PAIR  Constant 
first and second are both INVALID_BOOL_POINT .

bool_real_point INVALID_BOOL_REAL_POINT  Constant 
b is false , r is INVALID_REAL , and pt
is INVALID_POINT .

bool_point_quadruple INVALID_BOOL_POINT_QUADRUPLE  Constant 
first , second , third , and fourth are all
INVALID_BOOL_POINT .
