gluLoadSamplingMatrices

load NURBS sampling and culling matrices

Signature

gluLoadSamplingMatrices( GLUnurbs* ( nurb ) , const GLfloat * ( model ) , const GLfloat * ( perspective ) , const GLint * ( view ) )-> void
gluLoadSamplingMatrices( nurb , model , perspective , view )
gluLoadSamplingMatrices( POINTER(GLUnurbs)(nurb), arrays.GLfloatArray(model), arrays.GLfloatArray(perspective), arrays.GLintArray(view) ) -> None

Parameters

VariablesDescription
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