SoNurbsCurve(3IV)

NAME
SoNurbsCurve — NURBS curve shape node

INHERITS FROM
SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsCurve

SYNOPSIS
#include <Inventor/nodes/SoNurbsCurve.h>

Fields from class SoNurbsCurve:

SoSFInt32
numControlPoints
SoMFFloat
knotVector

Methods from class SoNurbsCurve:

SoNurbsCurve()
static SoType
getClassTypeId()

Methods from class SoNode:

void
setOverride(SbBool state)
SbBool
isOverride() const
SoNode *
copy(SbBool copyConnections = FALSE) const
virtual SbBool
affectsState() const
static SoNode *
getByName(const SbName &name)
static int
getByName(const SbName &name, SoNodeList &list)

Methods from class SoFieldContainer:

void
setToDefaults()
SbBool
hasDefaultValues() const
SbBool
fieldsAreEqual(const SoFieldContainer *fc) const
void
copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)
SbBool
set(const char *fieldDataString)
void
get(SbString &fieldDataString)
virtual int
getFields(SoFieldList &resultList) const
virtual SoField *
getField(const SbName &fieldName) const
SbBool
getFieldName(const SoField *field, SbName &fieldName) const
SbBool
isNotifyEnabled() const
SbBool
enableNotify(SbBool flag)

Methods from class SoBase:

void
ref()
void
unref() const
void
unrefNoDelete() const
void
touch()
virtual SoType
getTypeId() const
SbBool
isOfType(SoType type) const
virtual void
setName(const SbName &name)
virtual SbName
getName() const

DESCRIPTION
This class represents a NURBS curve, based on the knot vector and the control points that you specify. The knotVector field specifies a floating-point array of values; the values are the coordinates of the knot points in the curve, and you must enter them in non-decreasing order. The curve will use the first numControlPoints values in the current coordinates as control points.

If you specify n knots, you can specify up to n-8 control points. The number of knots minus the number of control points is known as the order of the curve. A NURBS curve can have an order of up to 8.

The control points of the curve are transformed by the current transformation matrix. The curve is drawn with the current lighting model and drawing style (drawing style FILLED is treated as LINES). The coordinates, normals, and texture coordinates of a NURBS curve are generated, so you cannot bind explicit normals or texture coordinates to a NURBS curve.

The approximation of the curve by line segments is affected by the current complexity value.

FIELDS
SoSFInt32
numControlPoints
Number of control points.

SoMFFloat
knotVector
The knot vector.

METHODS

SoNurbsCurve()
Creates a NURBS curve node with default settings.

static SoType
getClassTypeId()
Returns type identifier for this class.

ACTION BEHAVIOR
SoGLRenderAction
Draws the curve based on the current coordinates, material, and so on.

SoRayPickAction
Picks the curve based on the current coordinates and transformation.

SoGetBoundingBoxAction
Computes the bounding box that encloses all control points of the curve with the current transformation applied to them. Sets the center to the average of the control points.

SoCallbackAction
If any line segment callbacks are registered with the action, they will be invoked for each successive segment approximating the curve.

FILE FORMAT/DEFAULTS
NurbsCurve {
numControlPoints	0
knotVector	0
}

SEE ALSO
SoIndexedNurbsCurve, SoNurbsSurface