GLULOADSAMPLINGMATRICES - Online Linux Manual PageSection : 3G

NAME"gluLoadSamplingMatrices − load NURBS sampling and culling matrices

C SPECIFICATIONvoid gluLoadSamplingMatrices( GLUnurbs* nurb, const GLfloat *model, const GLfloat *perspective, const GLint *view )

PARAMETERSnurb  Specifies the NURBS object (created with ­gluNewNurbsRenderer). 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).

DESCRIPTION­gluLoadSamplingMatrices 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_TOLERANCE 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 convenient 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, projection matrix, and viewport.)

SEE ALSO­gluGetNurbsProperty(3G), ­gluNewNurbsRenderer(3G), ­gluNurbsProperty(3G)
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