SoNurbsCurve.3iv man page

SoNurbsCurve — NURBS curve shape node

Inherits from

SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsCurve


#include <Inventor/nodes/SoNurbsCurve.h>

Fields from class SoNurbsCurve:

SoSFInt32 numControlPoints

SoMFFloat knotVector

Methods from class 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


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.


SoSFInt32 numControlPoints
Number of control points.

SoMFFloat knotVector
The knot vector.


Creates a NURBS curve node with default settings.

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

Action Behavior

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

Picks the curve based on the current coordinates and transformation.

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.

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