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 )
delim$$

# 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)