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The Lounge What is on Your Mind? Major achievement ... applause! Post 303031375 by Scrutinizer on Wednesday 27th of February 2019 10:20:52 AM
Old 02-27-2019
Outstanding Corona688, keep leading the way as our dot on the horizon Smilie
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GLEVALPOINT(3G) 														   GLEVALPOINT(3G)

NAME
glEvalPoint1, glEvalPoint2 - generate and evaluate a single point in a mesh 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 dot DELTA(u) + u1 ); where DELTA(u) = ( 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 i dot DELTA(u) + u1 is exactly u2. In the two-dimensional case, glEvalPoint2, let DELTA(u) = ( u2 - u1 ) / n DELTA(v) = ( 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 glEvalCoord2( i dot DELTA(u) + u1, j dot DELTA(v) + v1 ); The only absolute numeric requirements are that if i=n, then the value computed from i dot DELTA(u) + u1 is exactly u2, and if j=m, then the value computed from i dot DELTA(v) + v1 is exactly v2. 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(3G)
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