GLEVALPOINT() GLEVALPOINT() NAME glEvalPoint1, glEvalPoint2 - generate and evaluate a single point in a mesh C SPECIFICATION void glEvalPoint1( GLint i ) void glEvalPoint2( GLint i, GLint j ) delim $$ 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 tra- versed 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 glEval- Point2 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 GLEVALPOINT()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | ASSOCIATED GETS | SEE ALSO
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