OpenGL man pages
gluLoadSamplingMatrices - load NURBS sampling and culling matrices
void gluLoadSamplingMatrices( GLUnurbsObj *nobj,
const GLfloat modelMatrix,
const GLfloat projMatrix,
const GLint viewport); )
nobj Specifies the NURBS object (created with gluNewNurbsRenderer).
modelMatrix Specifies a modelview matrix (as from a glGetFloatv call).
projMatrix Specifies a projection matrix (as from a glGetFloatv call).
viewport; Specifies a viewport (as from a glGetIntegerv call).
gluLoadSamplingMatrices uses modelMatrix, projMatrix, and viewport; to
recompute the sampling and culling matrices stored in nobj. 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 OpenGL server
is needed to fetch the current values of the modelview matrix, projection
matrix, and viewport.)
gluGetNurbsProperty, gluNewNurbsRenderer, gluNurbsProperty
Fri Dec 6 11:18:03 EST 1996
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