1GLULOADSAMPLINGMATRI(3G)         OpenGL Manual        GLULOADSAMPLINGMATRI(3G)
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NAME

6       gluLoadSamplingMatrices - load NURBS sampling and culling matrices
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C SPECIFICATION

9       void gluLoadSamplingMatrices(GLUnurbs* nurb, const GLfloat * model,
10                                    const GLfloat * perspective,
11                                    const GLint * view);
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PARAMETERS

14       nurb
15           Specifies the NURBS object (created with gluNewNurbsRenderer()).
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17       model
18           Specifies a modelview matrix (as from a glGetFloatv() call).
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20       perspective
21           Specifies a projection matrix (as from a glGetFloatv() call).
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23       view
24           Specifies a viewport (as from a glGetIntegerv() call).
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DESCRIPTION

27       gluLoadSamplingMatrices uses model, perspective, and view to recompute
28       the sampling and culling matrices stored in nurb. The sampling matrix
29       determines how finely a NURBS curve or surface must be tessellated to
30       satisfy the sampling tolerance (as determined by the
31       GLU_SAMPLING_TOLERANCE property). The culling matrix is used in
32       deciding if a NURBS curve or surface should be culled before rendering
33       (when the GLU_CULLING property is turned on).
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35       gluLoadSamplingMatrices is necessary only if the GLU_AUTO_LOAD_MATRIX
36       property is turned off (see gluNurbsProperty()). Although it can be
37       convenient to leave the GLU_AUTO_LOAD_MATRIX property turned on, there
38       can be a performance penalty for doing so. (A round trip to the GL
39       server is needed to fetch the current values of the modelview matrix,
40       projection matrix, and viewport.)
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SEE ALSO

43       gluGetNurbsProperty(), gluNewNurbsRenderer(), gluNurbsProperty()
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46       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
47       under the SGI Free Software B License. For details, see
48       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

51       opengl.org
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55opengl.org                        06/10/2014          GLULOADSAMPLINGMATRI(3G)
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