SoNurbsSurface(3IV)NAMESoNurbsSurface (SoNurbs) - NURBS surface shape node
INHERITS FROM
SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsSurfaceSYNOPSIS
#include <Inventor_c/nodes/SoNurbsSurface.h>
typedef SoNurbsSurface SoNurbs
Fields from class SoNurbsSurface:
SoSFInt32 numUControlPoints
SoSFInt32 numVControlPoints
SoSFInt32 numSControlPoints
SoSFInt32 numTControlPoints
SoMFFloat uKnotVector
SoMFFloat vKnotVector
SoMFFloat sKnotVector
SoMFFloat tKnotVector
Functions from class SoNurbsSurface:
SoNurbsSurface * SoNurbsCreate()
SoType SoNurbsGetClassTypeId()
Functions from class SoNode:
void SoNurbsSetOverride(SoNurbs *this, SbBool state)
SbBool SoNurbsIsOverride(const SoNurbs *this)
SoNode * SoNurbsCopy(const SoNurbs *this, SbBool
copyConnections = FALSE)
SbBool SoNurbsAffectsState(const SoNurbs *this)
SoNode * SoNurbsGetByName(const char *name)
int SoNurbsGetByNameList(const char *name, SoNodeList
*list)
Functions from class SoFieldContainer:
void SoNurbsSetToDflts(SoNurbs *this)
SbBool SoNurbsHasDfltVals(const SoNurbs *this)
SbBool SoNurbsFldsAreEq(const SoNurbs *this, const
SoFieldContainer *fc)
void SoNurbsCopyFieldVals(SoNurbs *this, const
SoFieldContainer *fc, SbBool copyConnections =
FALSE)
SbBool SoNurbsSet(SoNurbs *this, const char
*fieldDataString)
void SoNurbsGet(SoNurbs *this, SbString *fieldDataString)
int SoNurbsGetFields(const SoNurbs *this, SoFieldList
*resultList)
Page 1SoNurbsSurface(3IV)
SoField * SoNurbsGetField(const SoNurbs *this, const char
*fieldName)
SbBool SoNurbsGetFieldName(const SoNurbs *this, const
SoField *field, SbName *fieldName)
SbBool SoNurbsIsNotifyEnabled(const SoNurbs *this)
SbBool SoNurbsEnableNotify(SoNurbs *this, SbBool flag)
Functions from class SoBase:
void SoNurbsRef(SoNurbs *this)
void SoNurbsUnref(const SoNurbs *this)
void SoNurbsUnrefNoDelete(const SoNurbs *this)
void SoNurbsTouch(SoNurbs *this)
SoType SoNurbsGetTypeId(const SoNurbs *this)
SbBool SoNurbsIsOfType(const SoNurbs *this, SoType type)
void SoNurbsSetName(SoNurbs *this, const char *name)
SbName SoNurbsGetName(const SoNurbs *this)
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.
Page 2SoNurbsSurface(3IV)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.
FUNCTIONSSoNurbsSurface * SoNurbsCreate()
Creates a NURBS surface node with default settings.
SoType SoNurbsGetClassTypeId()
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
Page 3SoNurbsSurface(3IV)
vKnotVector 0
sKnotVector 0
tKnotVector 0
}
SEE ALSO
SoIndexedNurbsSurface, SoNurbsCurve, SoProfile
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