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Coin / src / vrml97 / NormalInterpolator.cpp

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/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif // HAVE_CONFIG_H

#ifdef HAVE_VRML97

/*!
  \class SoVRMLNormalInterpolator SoVRMLNormalInterpolator.h Inventor/VRMLnodes/SoVRMLNormalInterpolator.h
  \brief The SoVRMLNormalInterpolator class is used to interpolate normals.
  \ingroup VRMLnodes
  
  \WEB3DCOPYRIGHT

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

  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>).
  
*/

/*!
  \var SoMFVec3f SoVRMLNormalInterpolator::keyValue
  The keyValue vector.
*/

/*!
  \var SoEngineOutput SoVRMLNormalInterpolator::value_changed
  The eventOut which is sent every time the interpolator has calculated a new value.
*/

#include <Inventor/VRMLnodes/SoVRMLNormalInterpolator.h>

#include <Inventor/VRMLnodes/SoVRMLMacros.h>

#include "engines/SoSubNodeEngineP.h"

#ifndef DOXYGEN_SKIP_THIS

class SoVRMLNormalInterpolatorP {
public:
  SbList <SbVec3f> tmplist;
};

#endif // DOXYGEN_SKIP_THIS

SO_NODEENGINE_SOURCE(SoVRMLNormalInterpolator);

// Doc in parent
void
SoVRMLNormalInterpolator::initClass(void)
{
  SO_NODEENGINE_INTERNAL_INIT_CLASS(SoVRMLNormalInterpolator);
}

#define PRIVATE(obj) ((obj)->pimpl)

/*!
  Constructor.
*/
SoVRMLNormalInterpolator::SoVRMLNormalInterpolator(void)
{
  PRIVATE(this) = new SoVRMLNormalInterpolatorP;

  SO_NODEENGINE_INTERNAL_CONSTRUCTOR(SoVRMLNormalInterpolator);

  SO_VRMLNODE_ADD_EMPTY_EXPOSED_MFIELD(keyValue);
  SO_NODEENGINE_ADD_OUTPUT(value_changed, SoMFVec3f);
}

/*!
  Destructor.
*/
SoVRMLNormalInterpolator::~SoVRMLNormalInterpolator()
{
  delete PRIVATE(this);
}

// Doc in parent
void
SoVRMLNormalInterpolator::evaluate(void)
{
  if (!this->value_changed.isEnabled()) return;

  float interp;
  int i, idx = this->getKeyValueIndex(interp, this->keyValue.getNum());
  if (idx < 0) return;

  PRIVATE(this)->tmplist.truncate(0);
  const int numkeys = this->key.getNum();
  const int numcoords = this->keyValue.getNum() / numkeys;

  const SbVec3f * c0 = this->keyValue.getValues(idx*numcoords);
  const SbVec3f * c1 = c0;
  if (interp > 0.0f) c1 = this->keyValue.getValues((idx+1)*numcoords);

  for (i = 0; i < numcoords; i++) {
    PRIVATE(this)->tmplist.append(c0[i] + (c1[i]-c0[i]) * interp);
  }

  const SbVec3f * coords = PRIVATE(this)->tmplist.getArrayPtr();

  SO_ENGINE_OUTPUT(value_changed, SoMFVec3f, setNum(numcoords));
  SO_ENGINE_OUTPUT(value_changed, SoMFVec3f, setValues(0, numcoords, coords));
}

#undef PRIVATE

#endif // HAVE_VRML97