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gluLoadSamplingMatrices

Chapter 10

266

gluLoadSamplingMatrices

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.)

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