SoIndexedNurbsSurface.3iv man page

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

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