Ubuntu Manpage: SoIndexedNurbsSurface — indexed NURBS surface shape node

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NAME

       SoIndexedNurbsSurface — indexed NURBS surface shape node

INHERITS FROM

       SoBase > SoFieldContainer > SoNode > SoShape > SoIndexedNurbsSurface

SYNOPSIS

       #include <Inventor/nodes/SoIndexedNurbsSurface.h>

          Fields from class SoIndexedNurbsSurface:

     SoSFInt32           numUControlPoints
     SoSFInt32           numVControlPoints
     SoMFInt32           coordIndex
     SoMFFloat           uKnotVector
     SoMFFloat           vKnotVector
     SoSFInt32           numSControlPoints
     SoSFInt32           numTControlPoints
     SoMFInt32           textureCoordIndex
     SoMFFloat           sKnotVector
     SoMFFloat           tKnotVector

          Methods from class SoIndexedNurbsSurface:

                         SoIndexedNurbsSurface()
     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 knot vectors and the control
points that you specify. The uKnotVector and vKnotVector fields specify floating-point
arrays of values; the values are the coordinates of the knot points in the surface, and
you must enter them in non-decreasing order. The numUControlPoints and numVControlPoints
fields specify the number of control points the surface will have in the U and V
parametric directions, and will use the current coordinates that are indexed from the
coordIndex field.

You can get a surface of minimum order (2) in the U or V directions by specifying two more
knots than control points in that direction and having at least two control points in that
direction. This surface would appear creased in one direction.

You can get a surface of maximum order (8) in the U or V directions by specifying eight
more knots than control points in that direction and having at least eight control points
in that direction.

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 profiles 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.

FIELDS

     SoSFInt32           numUControlPoints
     SoSFInt32           numVControlPoints
          Number of control points in the U and V directions.

     SoMFInt32           coordIndex
          Coordinate indices.

     SoMFFloat           uKnotVector
     SoMFFloat           vKnotVector
          The knot vectors in the U and V directions.

     SoSFInt32           numSControlPoints
     SoSFInt32           numTControlPoints
          Number of control points in the S and T directions.

     SoMFInt32           textureCoordIndex
          Texture coordinate indices.

     SoMFFloat           sKnotVector
     SoMFFloat           tKnotVector
          The knot vectors in the S and T directions.

METHODS

                         SoIndexedNurbsSurface()
          Creates an indexed 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

       IndexedNurbsSurface {
          numUControlPoints  0
          numVControlPoints  0
          numSControlPoints  0
          numTControlPoints  0
          coordIndex         0
          uKnotVector        0
          vKnotVector        0
          sKnotVector        0
          tKnotVector        0
          textureCoordIndex  -1
     }