SuSE 11.3 - man page for gluloadsamplingmatrices (suse section 3G)
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gluLoadSamplingMatrices - load NURBS sampling and culling matrices
void gluLoadSamplingMatrices( GLUnurbs* nurb,
const GLfloat *model,
const GLfloat *perspective,
const GLint *view )
nurb 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).
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_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.)
gluGetNurbsProperty(3G), gluNewNurbsRenderer(3G), gluNurbsProperty(3G)
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