GLEVALPOINT - Online Linux Manual PageSection : 3G

NAME"glEvalPoint1, glEvalPoint2 − generate and evaluate a single point in a mesh

C SPECIFICATIONvoid glEvalPoint1( GLint i ) void glEvalPoint2( GLint i, GLint j )

PARAMETERSi  Specifies the integer value for grid domain variable i. j  Specifies the integer value for grid domain variable j (­glEvalPoint2 only).

DESCRIPTION­glMapGrid 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 \f7 glEvalCoord1( icdotDELTAu~+~u1 );
where
DELTAu~=~(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 icdotDELTAu~+~u1 is exactly u2. In the two-dimensional case, ­glEvalPoint2, let DELTAu~=~mark(u2-u1)/n DELTAv~=~mark(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 \f7 glEvalCoord2( icdotDELTAu~+~u1, jcdotDELTAv~+~v1 );
The only absolute numeric requirements are that if i~=~n, then the value computed from icdotDELTAu~+~u1 is exactly u2, and if j~=~m, then the value computed from icdotDELTAv~+~v1 is exactly v2.

ASSOCIATED GETS­glGet 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 ALSO­glEvalCoord(3G), ­glEvalMesh(3G), ­glMap1(3G), ­glMap2(3G), ­glMapGrid(3G)
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ERROR : Need New Coding :         (rof_escape_sequence|91|g___lEvalPoint.3G|46|\f7|\f7 )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|47|cdot|glEvalCoord1( i$^cdot^DELTA u ~+~ u sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|47|DELTA|glEvalCoord1( i$^cdot^DELTA u ~+~ u sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|54|DELTA|$DELTA u ~=~ ( u sub 2 - u sub 1 ) ^/^ n$ )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|62|cdot|$i ^cdot^ DELTA u ~+~ u sub 1$ is exactly $u sub 2$. )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|62|DELTA|$i ^cdot^ DELTA u ~+~ u sub 1$ is exactly $u sub 2$. )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|67|DELTA|$DELTA u ~=~ mark ( u sub 2 - u sub 1 ) ^/^ n$ )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|69|DELTA|$DELTA v ~=~ mark ( v sub 2 - v sub 1 ) ^/^ m,$ )         (rof_escape_sequence|91|g___lEvalPoint.3G|78|\f7|\f7 )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|79|cdot|glEvalCoord2( i$^cdot^DELTA u ~+~ u sub 1$, j$^cdot^DELTA v ~+~ v sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|79|DELTA|glEvalCoord2( i$^cdot^DELTA u ~+~ u sub 1$, j$^cdot^DELTA v ~+~ v sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|79|cdot|glEvalCoord2( i$^cdot^DELTA u ~+~ u sub 1$, j$^cdot^DELTA v ~+~ v sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|79|DELTA|glEvalCoord2( i$^cdot^DELTA u ~+~ u sub 1$, j$^cdot^DELTA v ~+~ v sub 1$ ); )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|85|cdot|$i ^cdot^DELTA u ~+~ u sub 1$ is exactly $u sub 2$, )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|85|DELTA|$i ^cdot^DELTA u ~+~ u sub 1$ is exactly $u sub 2$, )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|87|cdot|$i ^cdot^DELTA v ~+~ v sub 1$ is exactly $v sub 2$. )         (rof_EQ_stradd_html|19|g___lEvalPoint.3G|87|DELTA|$i ^cdot^DELTA v ~+~ v sub 1$ is exactly $v sub 2$. )