SoNurbsSurface(3IV)

NAME
     SoNurbsSurface (SoNurbs) - NURBS surface shape node

INHERITS FROM
     SoBase > SoFieldContainer > SoNode > SoShape > SoNurbsSurface

SYNOPSIS
     #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)
     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.

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.


FUNCTIONS
     SoNurbsSurface *    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
          vKnotVector        0
          sKnotVector        0
          tKnotVector        0
     }

SEE ALSO
     SoIndexedNurbsSurface, SoNurbsCurve, SoProfile