SoNurbsSurface(3IV)

NAME
SoNurbsSurface — NURBS surface shape node

INHERITS FROM
SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsSurface

SYNOPSIS
#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:

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

DESCRIPTION
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.

FIELDS
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.

METHODS

SoNurbsSurface()
Creates a 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
NurbsSurface {
numUControlPoints	0
numVControlPoints	0
numSControlPoints	0
numTControlPoints	0
uKnotVector	0
vKnotVector	0
sKnotVector	0
tKnotVector	0
}

SEE ALSO
SoIndexedNurbsSurface, SoNurbsCurve, SoProfile