generate and evaluate a single point in a mesh
Specifies the integer value for grid domain variable .
Specifies the integer value for grid domain variable ( glEvalPoint2 only).
glMapGrid and glEvalMesh are used in tandem to efficiently generate and evaluate a series of evenly spaced map domain values. glEvalPoint can be used to evaluate a single grid point in the same gridspace that is traversed by glEvalMesh . Calling glEvalPoint1 is equivalent to calling
glEvalCoord1( ); );where
and , , and are the arguments to the most recent glMapGrid1 command. The one absolute numeric requirement is that if , then the value computed from is exactly .
In the two-dimensional case, glEvalPoint2 , let
glGet with argument GL_MAP1_GRID_DOMAIN
glGet with argument GL_MAP2_GRID_DOMAIN
glGet with argument GL_MAP1_GRID_SEGMENTS
glGet with argument GL_MAP2_GRID_SEGMENTS
Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/ .