glEvalPoint man page on DigitalUNIX

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glEvalPoint(3G)						       glEvalPoint(3G)

NAME
       glEvalPoint,  glEvalPoint1, glEvalPoint2 - generate and evaluate a sin‐
       gle point in a mesh

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

PARAMETERS
       Specifies the integer value for grid domain variable i.	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.   glEval‐
       Point()	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[2] - u[1] ) / n

       and n, u[1], and u[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[1] is exactly u[2].

       In the two-dimensional case, glEvalPoint2, let

       DELTA u =  u[2] - u[1] ) / n

       DELTA v = ( v[2] - v[1] ) / m,

       where  n,  u[1],	 u[2], m, v[1], and v[2] are the arguments to the most
       recent glMapGrid2() command. Then the glEvalPoint2() command is equiva‐
       lent to calling

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

       The  only absolute numeric requirements are that if i=n, then the value
       computed from i . DELTA u + u[1] is exactly u[2], and if j=m, then  the
       value computed from i . DELTA v + v[1] is exactly v[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(3), glEvalMesh(3), glMap1(3), glMap2(3), glMapGrid(3)

							       glEvalPoint(3G)
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