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GLMAPGRID(3G)							 GLMAPGRID(3G)

NAME
       glMapGrid1d,  glMapGrid1f,  glMapGrid2d, glMapGrid2f - define a one- or
       two-dimensional mesh

C SPECIFICATION
       void glMapGrid1d( GLint un,
			 GLdouble u1,
			 GLdouble u2 )
       void glMapGrid1f( GLint un,
			 GLfloat u1,
			 GLfloat u2 )
       void glMapGrid2d( GLint un,
			 GLdouble u1,
			 GLdouble u2,
			 GLint vn,
			 GLdouble v1,
			 GLdouble v2 )
       void glMapGrid2f( GLint un,
			 GLfloat u1,
			 GLfloat u2,
			 GLint vn,
			 GLfloat v1,
			 GLfloat v2 )

PARAMETERS
       un  Specifies the number of partitions in the grid range interval  [u1,
	   u2].	 Must be positive.

       u1, u2
	   Specify the mappings for integer grid domain values i=0 and i=un.

       vn  Specifies  the number of partitions in the grid range interval [v1,
	   v2]
	   (glMapGrid2 only).

       v1, v2
	   Specify the mappings for integer grid domain values j=0 and j=vn
	   (glMapGrid2 only).

DESCRIPTION
       glMapGrid and glEvalMesh are used together to efficiently generate  and
       evaluate a series of evenly-spaced map domain values.  glEvalMesh steps
       through the integer domain of a one-  or	 two-dimensional  grid,	 whose
       range  is  the  domain  of  the evaluation maps specified by glMap1 and
       glMap2.

       glMapGrid1 and glMapGrid2 specify the linear grid mappings between  the
       i  (or  i and j) integer grid coordinates, to the u (or u and v) float‐
       ing-point evaluation  map  coordinates.	 See  glMap1  and  glMap2  for
       details of how u and v coordinates are evaluated.

       glMapGrid1  specifies  a	 single	 linear mapping such that integer grid
       coordinate 0 maps exactly to u1, and integer grid  coordinate  un  maps
       exactly to u2.  All other integer grid coordinates i are mapped so that

				  u=i(u2−u1)/un+u1

       glMapGrid2  specifies  two such linear mappings.	 One maps integer grid
       coordinate i=0 exactly to u1, and integer grid coordinate i=un  exactly
       to  u2.	 The other maps integer grid coordinate j=0 exactly to v1, and
       integer grid coordinate j=vn exactly to v2.  Other integer grid coordi‐
       nates i and j are mapped such that

				  u=i(u2−u1)/un+u1

				  v=j(v2−v1)/vn+v1

       The  mappings specified by glMapGrid are used identically by glEvalMesh
       and glEvalPoint.

ERRORS
       GL_INVALID_VALUE is generated if either un or vn is not positive.

       GL_INVALID_OPERATION is generated if glMapGrid is executed between  the
       execution of glBegin and the corresponding execution of glEnd.

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(3G),	    glEvalMesh(3G),    glEvalPoint(3G),	   glMap1(3G),
       glMap2(3G)

								 GLMAPGRID(3G)
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