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