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gluLoadSamplingMatrices - load NURBS sampling and culling matrices
void gluLoadSamplingMatrices( GLUnurbs* nurb,
const GLfloat *model,
const GLfloat *perspective,
const GLint *view )
eqn not supported
- 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).
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.)
gluGetNurbsProperty(3G)
,
gluNewNurbsRenderer(3G)
, gluNurbsProperty(3G)
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