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Man Pages


Manual Reference Pages  -  GLEVALPOINT2 (3)

NAME

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

CONTENTS

C Specification
Parameters
Description
Associated Gets
See Also

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 . 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

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
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GLEVALPOINT (-->)

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