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Manual Reference Pages  - GLULOADSAMPLINGMATRICES (3G)

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gluLoadSamplingMatrices - load NURBS sampling and culling matrices

CONTENTS

C Specification
Parameters
Description
See Also

void gluLoadSamplingMatrices( GLUnurbs* nurb,

                            const GLfloat *model,
                            const GLfloat *perspective,
                            const GLint *view )

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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