gluLoadSamplingMatrices(3) gluLoadSamplingMatrices(3)
NAME
gluLoadSamplingMatrices - load NURBS sampling and culling matrices
C SPECIFICATION
void gluLoadSamplingMatrices( GLUnurbs* nurb,
const GLfloat *model,
const GLfloat *perspective,
const GLint *view )
PARAMETERS
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).
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_TOLERANCE property). The culling matrix is used in decid-
ing 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(3), gluNewNurbsRenderer(3), gluNurbsProperty(3)
gluLoadSamplingMatrices(3)
Mac OS X 10.6 - Generated Thu Sep 17 20:20:33 CDT 2009