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gluLoadSamplingMatrices function

Applies to: desktop apps only

The gluLoadSamplingMatrices function loads Non-Uniform Rational B-Spline (NURBS) sampling and culling matrices.

Syntax

void WINAPI gluLoadSamplingMatrices(
  GLUnurbs *nobj,
  const GLfloat modelMatrix[16],
  const GLfloat projMatrix[16],
  const GLint viewport[4]
);

Parameters

nobj

The NURBS object (created with gluNewNurbsRenderer).

modelMatrix

A modelview matrix (as from a glGetFloatv call).

projMatrix

A projection matrix (as from a glGetFloatv call).

viewport

A viewport (as from a glGetIntegerv call).

Return value

This function does not return a value.

Remarks

The gluLoadSamplingMatrices function uses modelMatrix, projMatrix, and viewport to recompute the sampling and culling matrices stored in nobj. 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).

The gluLoadSamplingMatrices function 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, doing so necessitates a round trip to the OpenGL server to get the current values of the modelview matrix, projection matrix, and viewport.)

Requirements

Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Header

Glu.h

Library

Glu32.lib

DLL

Glu32.dll

See also

glGetFloatv
glGetIntegerv
gluGetNurbsProperty
gluNewNurbsRenderer

 

 

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Build date: 3/6/2012

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