Ubuntu Manpage: SoNurbsSurface — NURBS surface shape node

Provided by: inventor-doc_2.1.5-10+dfsg-2_all

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
     }