SoVRMLNormalInterpolator.3coin4 - Man Page

The SoVRMLNormalInterpolator class is used to interpolate normals.


#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 (

Constructor & Destructor Documentation

SoVRMLNormalInterpolator::SoVRMLNormalInterpolator (void)


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


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.


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Wed Jul 20 2022 Version 4.0.0 Coin