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GLULOADSAMPLINGMATRICES() GLULOADSAMPLINGMATRICES() NAME gluLoadSamplingMatrices - load NURBS sampling and culling matrices C SPECIFICATION void gluLoadSamplingMatrices( GLUnurbs* nurb, const GLfloat *model, const GLfloat *perspective, const GLint *view ) delim $$ PARAMETERS nurb Specifies the NURBS object (created with gluNewNurbsRen- derer). model Specifies a modelview matrix (as from a glGetFloatv call). perspective Specifies a projection matrix (as from a glGetFloatv call). view Specifies a viewport (as from a glGetIntegerv call). DESCRIPTION gluLoadSamplingMatrices uses model, perspective, and view to recompute the sampling and culling matrices stored in nurb. The sampling matrix determines how finely a NURBS curve or surface must be tessellated to satisfy the sampling tolerance (as determined by the GLU_SAMPLING_TOL- ERANCE property). The culling matrix is used in deciding if a NURBS curve or surface should be culled before rendering (when the GLU_CULLING property is turned on). gluLoadSamplingMatrices is necessary only if the GLU_AUTO_LOAD_MATRIX property is turned off (see gluNurbsProperty). Although it can be con- venient to leave the GLU_AUTO_LOAD_MATRIX property turned on, there can be a performance penalty for doing so. (A round trip to the GL server is needed to fetch the current values of the modelview matrix, projec- tion matrix, and viewport.) SEE ALSO gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty GLULOADSAMPLINGMATRICES()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | SEE ALSO
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