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gluNurbsPrperty

Chapter 12

307

gluNurbsPrperty

gluNurbsProperty: set a NURBS property.

C Speciﬁcation

void gluNurbsProperty(

GLUnurbs* nurb,

GLenum property,

GLfloat value)

Parameters

nurb Speciﬁes the NURBS object (created with gluNewNurbsRenderer).

property Speciﬁes the property to be set. Valid values are

GLU_SAMPLING_TOLERANCE, GLU_DISPLAY_MODE,

GLU_CULLING, GLU_AUTO_LOAD_MATRIX,

GLU_PARAMETRIC_TOLERANCE, GLU_SAMPLING_METHOD,

GLU_U_STEP, or GLU_V_STEP.

value Speciﬁes the value of the indicated property. It may be a numeric

value, or one of GLU_PATH_LENGTH, GLU_PARAMETRIC_ERROR,

or GLU_DOMAIN_DISTANCE.

Description

gluNurbsProperty is used to control properties stored in a NURBS object. These

properties affect the way that a NURBS curve is rendered. The accepted values for

property are as follows:

GLU_SAMPLING_METHOD

Speciﬁes how a NURBS surface should be tessellated. value may be one of

GLU_PATH_LENGTH, GLU_PARAMETRIC_ERROR, or GLU_DOMAIN_DISTANCE.

When set to GLU_PATH_LENGTH, the surface is rendered so that the maximum

length, in pixels, of the edges of the tessellation polygons is no greater than what is

speciﬁed by GLU_SAMPLING_TOLERANCE. The initial value of

GLU_SAMPLING_METHOD is GLU_PATH_LENGTH.

GLU_PARAMETRIC_ERROR

Speciﬁes that the surface is rendered in such a way that the value speciﬁed by

GLU_PARAMETRIC_TOLERANCE describes the maximum distance, in pixels,between

the tessellation polygons and the surfaces they approximate.

GLU_DOMAIN_DISTANCE

Allows users to specify, in parametric coordinates, how many sample points per unit

length are taken in u, v direction.

GLU_SAMPLING_TOLERANCE

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