Gluloadsamplingmatrices - HP b2600 Reference Manual

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gluLoadSamplingMatrices

gluLoadSamplingMatrices
gluLoadSamplingMatrices: load NURBS sampling and culling matrices.
C Specification
void gluLoadSamplingMatrices(
Parameters
nurb
model
perspective
view
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,
gluNewNurbsRenderer,
gluNurbsProperty
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GLUnurbs* nurb,
const GLfloat *model,
const GLfloat *perspective,
const GLint *view)
Specifies the NURBS object (created with gluNewNurbsRenderer).
Specifies a modelview matrix (as from a glGetFloatv call).
Specifies a projection matrix (as from a glGetFloatv call).
Specifies a viewport (as from a glGetIntegerv call).
Chapter 10