text: //=============================================================================================================
  /**
   * @file     shownormalsmaterial.h
   * @author   Lars Debor <Lars.Debor@tu-ilmenau.de>;
   *           Lorenz Esch <lesch@mgh.harvard.edu>
   * @version  dev
   * @date     January, 2017
   *
   * @section  LICENSE
   *
   * Copyright (C) 2017, Lars Debor, Lorenz Esch. 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 MNE-CPP authors 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 OWNER 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.
   *
   *
   * @brief    ShowNormalsMaterial class declaration
   */
  
  #ifndef DISP3DLIB_SHOWNORMALSMATERIAL_H
  #define DISP3DLIB_SHOWNORMALSMATERIAL_H
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // INCLUDES
  //=============================================================================================================
  
  #include "../../../disp3D_global.h"
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // QT INCLUDES
  //=============================================================================================================
  
  #include <Qt3DRender/qmaterial.h>
  #include <QPointer>
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // Eigen INCLUDES
  //=============================================================================================================
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // FORWARD DECLARATIONS
  //=============================================================================================================
  
  namespace Qt3DRender {
      class QMaterial;
      class QEffect;
      class QParameter;
      class QShaderProgram;
      class QMaterial;
      class QFilterKey;
      class QTechnique;
      class QRenderPass;
      class QGraphicsApiFilter;
  }
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // DEFINE NAMESPACE DISP3DLIB
  //=============================================================================================================
  
  namespace DISP3DLIB
  {
  
  
  //*************************************************************************************************************
  //=============================================================================================================
  // DISP3DLIB FORWARD DECLARATIONS
  //=============================================================================================================
  
  
  //=============================================================================================================
  /**
   * ShowNormalsMaterial is provides a Qt3D material with own shader support.
   *
   * @brief ShowNormalsMaterial is provides a Qt3D material with own shader support.
   */
  class DISP3DSHARED_EXPORT ShowNormalsMaterial : public Qt3DRender::QMaterial
  {
      Q_OBJECT
  
  public:
      //=========================================================================================================
      /**
       * Default constructor.
       *
       * @param[in] parent         The parent of this class.
       */
      explicit ShowNormalsMaterial(Qt3DCore::QNode *parent = 0);
  
      //=========================================================================================================
      /**
       * Default destructor.
       */
      ~ShowNormalsMaterial() = default;
  
  private:
      //=========================================================================================================
      /**
       * Init the ShowNormalsMaterial class.
       */
      void init();
  
      QPointer<Qt3DRender::QEffect>                   m_pVertexEffect;
  
      QPointer<Qt3DRender::QFilterKey>                m_pFilterKey;
  
      QPointer<Qt3DRender::QTechnique>                m_pVertexGL3Technique;
      QPointer<Qt3DRender::QRenderPass>               m_pVertexGL3RenderPass;
      QPointer<Qt3DRender::QShaderProgram>            m_pVertexGL3Shader;
  };
  
  } // namespace DISP3DLIB
  
  #endif // DISP3DLIB_SHOWNORMALSMATERIAL_H
  