glevalpoint man page on Solaris

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GLEVALPOINT(3gl)					      GLEVALPOINT(3gl)

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⋅Δu+u1);
					where

				    Δu=(u2−u1)/n

       and n, u1, and u2 are the arguments to the most recent glMapGrid1  com‐
       mand.   The  one	 absolute numeric requirement is that if i=n, then the
       value computed from i⋅Δu+u1 is exactly u2.

       In the two-dimensional case, glEvalPoint2, let

				    Δu=(u2−u1)/n

				    Δv=(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⋅Δu+u1, j⋅Δv+v1);
       The only absolute numeric requirements are that if i=n, then the	 value
       computed	 from  i⋅Δu+u1	is exactly u2, and if j=m, then the value com‐
       puted from j⋅Δv+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

				   15 Mar 97		      GLEVALPOINT(3gl)
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