NAME

       SoVRMLNormalInterpolator -

       The SoVRMLNormalInterpolator class is used to interpolate normals.

       The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
       14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
       Consortium:

SYNOPSIS

       #include <Inventor/VRMLnodes/SoVRMLNormalInterpolator.h>

       Inherits SoVRMLInterpolator.

   Public Member Functions
       virtual SoType getTypeId (void) const
           Returns the type identification of an object derived from a class inheriting SoBase.
           This is used for run-time type checking and 'downward' casting.
       virtual const SoEngineOutputData * getOutputData (void) const
       SoVRMLNormalInterpolator (void)

   Static Public Member Functions
       static SoType getClassTypeId (void)
       static void * createInstance (void)
       static void initClass (void)

   Public Attributes
       SoMFVec3f keyValue
       SoEngineOutput value_changed

   Protected Member Functions
       virtual const SoFieldData * getFieldData (void) const
       virtual ~SoVRMLNormalInterpolator ()

   Static Protected Member Functions
       static const SoFieldData ** getFieldDataPtr (void)
       static const SoEngineOutputData ** getOutputDataPtr (void)

   Additional Inherited Members

Detailed Description

       The SoVRMLNormalInterpolator class is used to interpolate normals.

       The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
       14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
       Consortium:

       NormalInterpolator {
         eventIn      SFFloat set_fraction       # (-inf, inf)
         exposedField MFFloat key           []   # (-inf, inf)
         exposedField MFVec3f keyValue      []   # (-inf, inf)
         eventOut     MFVec3f value_changed
       }

       The NormalInterpolator node interpolates among a list of normal vector sets specified by
       the keyValue field. The output vector, value_changed, shall be a set of normalized
       vectors. Values in the keyValue field shall be of unit length. The number of normals in
       the keyValue field shall be an integer multiple of the number of keyframes in the key
       field. That integer multiple defines how many normals will be contained in the
       value_changed events. Normal interpolation shall be performed on the surface of the unit
       sphere. That is, the output values for a linear interpolation from a point P on the unit
       sphere to a point Q also on the unit sphere shall lie along the shortest arc (on the unit
       sphere) connecting points P and Q. Also, equally spaced input fractions shall result in
       arcs of equal length. The results are undefined if P and Q are diagonally opposite. A more
       detailed discussion of interpolators is provided in 4.6.8, Interpolator nodes
       (http://www.web3d.org/x3d/specifications/vrml/ISO-
       IEC-14772-VRML97/part1/concepts.html#4.6.8).

Constructor & Destructor Documentation

   SoVRMLNormalInterpolator::SoVRMLNormalInterpolator (void)
       Constructor.

   SoVRMLNormalInterpolator::~SoVRMLNormalInterpolator () [protected],  [virtual]
       Destructor.

Member Function Documentation

   SoType SoVRMLNormalInterpolator::getTypeId (void) const [virtual]
       Returns the type identification of an object derived from a class inheriting SoBase. This
       is used for run-time type checking and 'downward' casting. Usage example:

       void foo(SoNode * node)
       {
         if (node->getTypeId() == SoFile::getClassTypeId()) {
           SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
         }
       }

       For application programmers wanting to extend the library with new nodes, engines,
       nodekits, draggers or others: this method needs to be overridden in all subclasses. This
       is typically done as part of setting up the full type system for extension classes, which
       is usually accomplished by using the pre-defined macros available through for instance
       Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes),
       Inventor/engines/SoSubEngine.h (for engine classes) and so on.

       For more information on writing Coin extensions, see the class documentation of the
       toplevel superclasses for the various class groups.

       Reimplemented from SoVRMLInterpolator.

   const SoFieldData * SoVRMLNormalInterpolator::getFieldData (void) const [protected],
       [virtual]
       Returns a pointer to the class-wide field data storage object for this instance. If no
       fields are present, returns NULL.

       Reimplemented from SoVRMLInterpolator.

   const SoEngineOutputData * SoVRMLNormalInterpolator::getOutputData (void) const [virtual]
       This API member is considered internal to the library, as it is not likely to be of
       interest to the application programmer.

       Reimplemented from SoVRMLInterpolator.

Member Data Documentation

   SoMFVec3f SoVRMLNormalInterpolator::keyValue
       The keyValue vector.

   SoEngineOutput SoVRMLNormalInterpolator::value_changed
       The eventOut which is sent every time the interpolator has calculated a new value.

Author

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