GLUGETNURBSPROPERTY(3G)GLUGETNURBSPROPERTY(3G)NAME
gluGetNurbsProperty - get a NURBS property
C SPECIFICATION
void gluGetNurbsProperty( GLUnurbs* nurb,
GLenum property,
GLfloat* data )
PARAMETERS
nurb Specifies the NURBS object (created with gluNewNurbsRenderer).
property Specifies the property whose value is to be fetched. Valid values are GLU_CULLING, GLU_SAMPLING_TOLERANCE, GLU_DISPLAY_MODE,
GLU_AUTO_LOAD_MATRIX, GLU_PARAMETRIC_TOLERANCE, GLU_SAMPLING_METHOD, GLU_U_STEP, GLU_V_STEP and GLU_NURBS_MODE.
data Specifies a pointer to the location into which the value of the named property is written.
DESCRIPTION
gluGetNurbsProperty retrieves properties stored in a NURBS object. These properties affect the way that NURBS curves and surfaces are ren-
dered. See the gluNurbsProperty reference page for information about what the properties are and what they do.
SEE ALSO
gluNewNurbsRenderer, gluNurbsProperty
GLUGETNURBSPROPERTY(3G)
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GLULOADSAMPLINGMATRICES(3G)GLULOADSAMPLINGMATRICES(3G)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 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 ALSO gluGetNurbsProperty(3G), gluNewNurbsRenderer(3G), gluNurbsProperty(3G)GLULOADSAMPLINGMATRICES(3G)
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