glEvalPoint man page on Darwin

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GLEVALPOINT(3G)						       GLEVALPOINT(3G)

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 dot DELTA(u) + u1 );
where

	      DELTA(u) = ( u2 - u1 ) / n

and n, u1, and u2 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 dot DELTA(u) + u1 is exactly u2.

In the two-dimensional case, glEvalPoint2, let

       DELTA(u) = ( u2 - u1 ) / n

       DELTA(v) = ( v2 - v1 ) / m,

where n, u1, u2, m, v1, and v2 are the arguments to the most recent glMapGrid2
command.  Then the glEvalPoint2 command is equivalent to calling

       glEvalCoord2( i dot DELTA(u) + u1, j dot DELTA(v) + v1 );
The  only  absolute  numeric requirements are that if i=n, then the value com‐
puted from i dot DELTA(u) + u1 is exactly u2, and if j=m, then the value  com‐
puted from i dot DELTA(v) + v1 is exactly v2.

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

							       GLEVALPOINT(3G)
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