📄 evalpoint.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>glEvalPoint1,</STRONG> <STRONG>glEvalPoint2</STRONG> - generate and evaluate a single point in a mesh <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG> void <STRONG>glEvalPoint1</STRONG>( GLint <EM>i</EM> ) void <STRONG>glEvalPoint2</STRONG>( GLint <EM>i</EM>, GLint <EM>j</EM> ) <STRONG>PARAMETERS</STRONG> <EM>i</EM> Specifies the integer value for grid domain variable i. <EM>j</EM> Specifies the integer value for grid domain variable j (<STRONG>glEvalPoint2</STRONG> only). <STRONG>DESCRIPTION</STRONG> <STRONG>glMapGrid</STRONG> and <STRONG>glEvalMesh</STRONG> are used in tandem to efficiently generate and evaluate a series of evenly spaced map domain values. <STRONG>glEvalPoint</STRONG> can be used to evaluate a single grid point in the same gridspace that is traversed by <STRONG>glEvalMesh</STRONG>. Calling <STRONG>glEvalPoint1</STRONG> 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 <STRONG>glMapGrid1</STRONG> 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, <STRONG>glEvalPoint2</STRONG>, 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 <STRONG>glMapGrid2</STRONG> command. Then the <STRONG>glEvalPoint2</STRONG> 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 <STRONG>ASSOCIATED</STRONG> <STRONG>GETS</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP1_GRID_DOMAIN</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP2_GRID_DOMAIN</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP1_GRID_SEGMENTS</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP2_GRID_SEGMENTS</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>glEvalCoord</STRONG>, <STRONG>glEvalMesh</STRONG>, <STRONG>glMap1</STRONG>, <STRONG>glMap2</STRONG>, <STRONG>glMapGrid</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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