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

glEvalPoint
	glEvalPoint(i[, j]) | glEvalPoint((i[, j])) -> None
glEvalPoint1
	glEvalPoint1(i) -> None
glEvalPoint2
	glEvalPoint2(i, j) -> None

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

i  Specifies the integer value for grid domain variable i.

j  Specifies the integer value for grid domain variable j
   (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(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

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

glEvalCoord, glEvalMesh, glMap1, glMap2, glMapGrid