SoNurbsSurface.3iv man page

SoNurbsSurface — NURBS surface shape node

Inherits from

SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsSurface


#include <Inventor/nodes/SoNurbsSurface.h>

Fields from class SoNurbsSurface:

SoSFInt32 numUControlPoints

SoSFInt32 numVControlPoints

SoSFInt32 numSControlPoints

SoSFInt32 numTControlPoints

SoMFFloat uKnotVector

SoMFFloat vKnotVector

SoMFFloat sKnotVector

SoMFFloat tKnotVector

Methods from class SoNurbsSurface:


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 shape node represents a NURBS surface based on the node's knot vectors and on control points constructed from the current coordinates. The current coordinates are used in row-major order (the V direction corresponds to the rows). The number of coordinates used is determined by the numUControlPoints and numVControlPoints fields. The uKnotVector and vKnotVector fields contain floating point arrays of non-decreasing values.

The order of the surface in the U and V directions is defined as the number of knots minus the number of control points in the particular direction. The largest order allowed for a NURBS surface is 8.

The control points of the NURBS surface are transformed by the current cumulative transformation. The surface is drawn with the current light model and drawing style. The coordinates, normals, and texture coordinates of a surface are generated, so you cannot bind explicit normals or texture coordinates to a NURBS surface. The first material in the state is applied to the entire surface.

The surface is trimmed according to the currently defined profile's curves.

When default texture coordinates are applied to a NURBS surface, the edges of the texture square are stretched to fit the surface. The axes of the texture are called S and T; S is horizontal and T is vertical. The axes of the NURBS surface are called U and V; U is horizontal and V is vertical. You can also define texture coordinates explicitly with the S,T location point, the knot vectors, and the current texture coordinates.

The approximation of the surface by polygons is affected by the current complexity value.


SoSFInt32 numUControlPoints

SoSFInt32 numVControlPoints
Number of control points in the U and V directions.

SoSFInt32 numSControlPoints

SoSFInt32 numTControlPoints
Number of control points in the S and T directions.

SoMFFloat uKnotVector

SoMFFloat vKnotVector
The knot vectors in the U and V directions.

SoMFFloat sKnotVector

SoMFFloat tKnotVector
The knot vectors in the S and T directions.


Creates a NURBS surface node with default settings.

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

Action Behavior

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

Picks the surface based on the current coordinates and transformation.

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

If any triangle callbacks are registered with the action, they will be invoked for each successive triangle approximating the surface.

File Format/Defaults

NurbsSurface {
numUControlPoints	0
numVControlPoints	0
numSControlPoints	0
numTControlPoints	0
uKnotVector	0
vKnotVector	0
sKnotVector	0
tKnotVector	0

See Also

SoIndexedNurbsSurface, SoNurbsCurve, SoProfile