---
name: "SoIndexedNurbsSurface"
section: "3iv"
platform: "linux"
package: "inventor-doc"
version: "2.1.6+ds-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SoIndexedNurbsSurface/3iv"
---

# SoIndexedNurbsSurface(3iv)

indexed NURBS surface shape node

## NAME

SoIndexedNurbsSurface — indexed NURBS surface shape node

## INHERITS FROM

SoBase \> SoFieldContainer \> SoNode \> SoShape \> SoIndexedNurbsSurface

## SYNOPSIS

**#include \<Inventor/nodes/SoIndexedNurbsSurface.h\>**

Fields from class SoIndexedNurbsSurface:

**SoSFInt32**	**numUControlPoints**\
 **SoSFInt32**	**numVControlPoints**\
 **SoMFInt32**	**coordIndex**\
 **SoMFFloat**	**uKnotVector**\
 **SoMFFloat**	**vKnotVector**\
 **SoSFInt32**	**numSControlPoints**\
 **SoSFInt32**	**numTControlPoints**\
 **SoMFInt32**	**textureCoordIndex**\
 **SoMFFloat**	**sKnotVector**\
 **SoMFFloat**	**tKnotVector**

Methods from class SoIndexedNurbsSurface:

	**SoIndexedNurbsSurface()**\
 **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 shape node represents a NURBS surface based on the knot vectors and the control points that you specify. The uKnotVector** and **vKnotVector** fields specify floating-point arrays of values; the values are the coordinates of the knot points in the surface, and you must enter them in non-decreasing order. The **numUControlPoints** and **numVControlPoints** fields specify the number of control points the surface will have in the U and V parametric directions, and will use the current coordinates that are indexed from the **coordIndex** field.

You can get a surface of minimum order (2) in the U or V directions by specifying two more knots than control points in that direction and having at least two control points in that direction. This surface would appear creased in one direction.

You can get a surface of maximum order (8) in the U or V directions by specifying eight more knots than control points in that direction and having at least eight control points in that direction.

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 profiles 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.

## FIELDS

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

**SoMFInt32**	**coordIndex**\
 Coordinate indices.

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

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

**SoMFInt32**	**textureCoordIndex**\
 Texture coordinate indices.

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

## METHODS

	**SoIndexedNurbsSurface()**\
 Creates an indexed NURBS surface node with default settings.

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

## ACTION BEHAVIOR

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

**SoRayPickAction**\
 Picks the surface based on the current coordinates and transformation.

**SoGetBoundingBoxAction**\
 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.

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

## FILE FORMAT/DEFAULTS

```
IndexedNurbsSurface {
numUControlPoints	0
numVControlPoints	0
numSControlPoints	0
numTControlPoints	0
coordIndex	0
uKnotVector	0
vKnotVector	0
sKnotVector	0
tKnotVector	0
textureCoordIndex	-1
}
```

## SEE ALSO

**SoIndexedNurbsCurve, SoNurbsSurface, SoProfile**