NAME
	  glEvalPoint1,	glEvalPoint2 - generate	and evaluate a single
	  point	in a mesh


     C SPECIFICATION
	  void glEvalPoint1( GLint i )
	  void glEvalPoint2( GLint i,
			     GLint j )


     PARAMETERS
	  i  Specifies the integer value for grid domain variable i.

	  j  Specifies the integer value for grid domain variable j
	     (glEvalPoint2 only).

     DESCRIPTION
	  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(i . DELTA u + u );
				      1
	  where

	  DELTA	u = (u - u  ) /	n
		      2	  1

	  and n, u , and u
		  1	  2

	  are the arguments to the most	recent glMapGrid1 command.
	  The one absolute numeric requirement is that if i = n, then
	  the value computed from
	  i . DELTA u +	u  is exactly u	.
			 1	       2


	  In the two-dimensional case, glEvalPoint2, let
	  DELTA	u = (u	- u )/n
		      2	   1

	  DELTA	v = (v	- v )/m
		      2	   1

	  where	n, u , u , m, v	, and v
		    1	2      1       2

	  are the arguments to the most	recent glMapGrid2 command.
	  Then the glEvalPoint2	command	is equivalent to calling

	  glEvalCoord2(i .  DELTA u + u	, j . DELTA v +	v );
				       1		 1

	  The only absolute numeric requirements are that if i = n,
	  then the value computed from

	  i . DELTA u +	u  is exactly u	,
			 1	       2
	  and if j = m,	then the value computed	from

	  j cdot DELTA v + v  is exactly v .
			    1		  2

     ASSOCIATED	GETS
	  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

     SEE ALSO
	  glEvalCoord, glEvalMesh, glMap1, glMap2, glMapGrid