## Overview

NurbsPatchSurface defines a contiguous 3D Non-Uniform Rational B-Spline (NURBS) surface.

The NurbsPatchSurface node belongs to the **NURBS** component and its default container field is *geometry.* It is available since X3D version 3.0 or later.

## Hierarchy

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+ X3DNode
+ X3DGeometryNode
+ X3DParametricGeometryNode
+ X3DNurbsSurfaceGeometryNode
+ NurbsPatchSurface

## Fields

### SFNode [in, out] **metadata** NULL [X3DMetadataObject]

Metadata are not part of the X3D world and not interpreted by the X3D browser, but they can be accessed via the ECMAScript interface.

### SFInt32 [in, out] **uTessellation** (-∞,∞)

Hint for surface tesselation.

### SFInt32 [in, out] **vTessellation** (-∞,∞)

Hint for surface tesselation.

### SFBool [ ] **uClosed** FALSE

Whether opposite surface sides are closed (seamless) across u dimension.

### SFBool [ ] **vClosed** FALSE

Whether opposite surface sides are closed (seamless) across u dimension.

### SFBool [ ] **solid** TRUE

Setting solid true means draw only one side of polygons (backface culling on), setting solid false means draw both sides of polygons (backface culling off).

#### Hint

- If in doubt, use solid=’false’ for maximum visibility.

#### Warning

- Default value true can completely hide geometry if viewed from wrong side!

### SFInt32 [ ] **uOrder** 3 [2,∞)

Define order of surface by polynomials of degree = order-1.

### SFInt32 [ ] **vOrder** 3 [2,∞)

Define order of surface by polynomials of degree = order-1.

### SFInt32 [ ] **uDimension** [0,∞)

Number of control points in u dimension.

### SFInt32 [ ] **vDimension** [0,∞)

Number of control points in v dimension.

### MFDouble [ ] **uKnot** [ ] (-∞,∞)

Knot vector, where size = number of control points + order of curve.

### MFDouble [ ] **vKnot** [ ] (-∞,∞)

Knot vector, where size = number of control points + order of curve.

### MFDouble [in, out] **weight** [ ] (0,∞)

Vector assigning relative weight value to each control point.

### SFNode [in, out] **texCoord** NULL [X3DTextureCoordinateNode|NurbsTextureCoordinate]

Input/Output field texCoord.

### SFNode [in, out] **controlPoint** NULL [X3DCoordinateNode]

Input/Output field controlPoint.