qgspoint3dsymbol_p.cpp

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/***************************************************************************
  qgspoint3dsymbol_p.cpp
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgspoint3dsymbol_p.h"
 
#include <Qt3DRender/QAttribute>
#include <Qt3DRender/QBuffer>
#include <Qt3DRender/QEffect>
#include <Qt3DRender/QGraphicsApiFilter>
#include <Qt3DRender/QParameter>
#include <Qt3DRender/QTechnique>
 
#include <Qt3DExtras/QCylinderGeometry>
#include <Qt3DExtras/QConeGeometry>
#include <Qt3DExtras/QCuboidGeometry>
#include <Qt3DExtras/QPlaneGeometry>
#include <Qt3DExtras/QSphereGeometry>
#include <Qt3DExtras/QTorusGeometry>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DRender/QSceneLoader>
#include <Qt3DRender/QPaintedTextureImage>
 
#include <Qt3DRender/QMesh>
 
#include <Qt3DExtras/QExtrudedTextGeometry>
 
#include <QUrl>
#include <QVector3D>
 
#include "qgspoint3dsymbol.h"
#include "qgs3dmapsettings.h"
 
#include "qgsapplication.h"
#include "qgsvectorlayer.h"
#include "qgspoint.h"
#include "qgs3dutils.h"
#include "qgsbillboardgeometry.h"
#include "qgspoint3dbillboardmaterial.h"
#include "qgslogger.h"
#include "qgssourcecache.h"
#include "qgssymbol.h"
#include "qgssymbollayerutils.h"
#include "qgssymbollayer.h"
 
 
 
//* INSTANCED RENDERING *//
 
 
class QgsInstancedPoint3DSymbolHandler : public QgsFeature3DHandler
{
  public:
    QgsInstancedPoint3DSymbolHandler( const QgsPoint3DSymbol *symbol, const QgsFeatureIds &selectedIds )
      : mSymbol( static_cast< QgsPoint3DSymbol *>( symbol->clone() ) )
      , mSelectedIds( selectedIds ) {}
 
    bool prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames ) override;
    void processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context ) override;
 
  private:
 
    static Qt3DRender::QMaterial *material( const QgsPoint3DSymbol *symbol );
    static Qt3DRender::QGeometryRenderer *renderer( const QgsPoint3DSymbol *symbol, const QVector<QVector3D> &positions );
    static Qt3DRender::QGeometry *symbolGeometry( QgsPoint3DSymbol::Shape shape, const QVariantMap &shapeProperties );
 
    struct PointData
    {
      QVector<QVector3D> positions;  // contains triplets of float x,y,z for each point
    };
 
    void makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected );
 
    // input specific for this class
    std::unique_ptr< QgsPoint3DSymbol > mSymbol;
    // inputs - generic
    QgsFeatureIds mSelectedIds;
 
    // outputs
    PointData outNormal;  
    PointData outSelected;  
};
 
 
bool QgsInstancedPoint3DSymbolHandler::prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames )
{
  Q_UNUSED( context )
  Q_UNUSED( attributeNames )
  return true;
}
 
void QgsInstancedPoint3DSymbolHandler::processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context )
{
  PointData &out = mSelectedIds.contains( feature.id() ) ? outSelected : outNormal;
 
  if ( feature.geometry().isNull() )
    return;
 
  Qgs3DUtils::extractPointPositions( feature, context.map(), mSymbol->altitudeClamping(), out.positions );
}
 
void QgsInstancedPoint3DSymbolHandler::finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context )
{
  makeEntity( parent, context, outNormal, false );
  makeEntity( parent, context, outSelected, true );
 
  updateZRangeFromPositions( outNormal.positions );
  updateZRangeFromPositions( outSelected.positions );
 
  // the elevation offset is applied in the vertex shader so let's account for it as well
  float symbolHeight = mSymbol->transform().data()[13];
  mZMin += symbolHeight;
  mZMax += symbolHeight;
}
 
void QgsInstancedPoint3DSymbolHandler::makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected )
{
  // build the default material
  Qt3DRender::QMaterial *mat = material( mSymbol.get() );
 
  if ( selected )
  {
    // update the material with selection colors
    for ( Qt3DRender::QParameter *param : mat->effect()->parameters() )
    {
      if ( param->name() == QLatin1String( "kd" ) ) // diffuse
        param->setValue( context.map().selectionColor() );
      else if ( param->name() == QLatin1String( "ka" ) ) // ambient
        param->setValue( context.map().selectionColor().darker() );
    }
  }
 
  // build the entity
  Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
  entity->addComponent( renderer( mSymbol.get(), out.positions ) );
  entity->addComponent( mat );
  entity->setParent( parent );
 
// cppcheck wrongly believes entity will leak
// cppcheck-suppress memleak
}
 
 
 
Qt3DRender::QMaterial *QgsInstancedPoint3DSymbolHandler::material( const QgsPoint3DSymbol *symbol )
{
  Qt3DRender::QFilterKey *filterKey = new Qt3DRender::QFilterKey;
  filterKey->setName( QStringLiteral( "renderingStyle" ) );
  filterKey->setValue( "forward" );
 
  // the fragment shader implements a simplified version of phong shading that uses hardcoded light
  // (instead of whatever light we have defined in the scene)
  // TODO: use phong shading that respects lights from the scene
  Qt3DRender::QShaderProgram *shaderProgram = new Qt3DRender::QShaderProgram;
  shaderProgram->setVertexShaderCode( Qt3DRender::QShaderProgram::loadSource( QUrl( QStringLiteral( "qrc:/shaders/instanced.vert" ) ) ) );
  shaderProgram->setFragmentShaderCode( Qt3DRender::QShaderProgram::loadSource( QUrl( QStringLiteral( "qrc:/shaders/instanced.frag" ) ) ) );
 
  Qt3DRender::QRenderPass *renderPass = new Qt3DRender::QRenderPass;
  renderPass->setShaderProgram( shaderProgram );
 
  Qt3DRender::QTechnique *technique = new Qt3DRender::QTechnique;
  technique->addFilterKey( filterKey );
  technique->addRenderPass( renderPass );
  technique->graphicsApiFilter()->setApi( Qt3DRender::QGraphicsApiFilter::OpenGL );
  technique->graphicsApiFilter()->setProfile( Qt3DRender::QGraphicsApiFilter::CoreProfile );
  technique->graphicsApiFilter()->setMajorVersion( 3 );
  technique->graphicsApiFilter()->setMinorVersion( 2 );
 
  QMatrix4x4 transformMatrix = symbol->transform();
  QMatrix3x3 normalMatrix = transformMatrix.normalMatrix();  // transponed inverse of 3x3 sub-matrix
 
  // QMatrix3x3 is not supported for passing to shaders, so we pass QMatrix4x4
  float *n = normalMatrix.data();
  QMatrix4x4 normalMatrix4(
    n[0], n[3], n[6], 0,
    n[1], n[4], n[7], 0,
    n[2], n[5], n[8], 0,
    0, 0, 0, 0 );
 
  Qt3DRender::QParameter *paramInst = new Qt3DRender::QParameter;
  paramInst->setName( QStringLiteral( "inst" ) );
  paramInst->setValue( transformMatrix );
 
  Qt3DRender::QParameter *paramInstNormal = new Qt3DRender::QParameter;
  paramInstNormal->setName( QStringLiteral( "instNormal" ) );
  paramInstNormal->setValue( normalMatrix4 );
 
  Qt3DRender::QEffect *effect = new Qt3DRender::QEffect;
  effect->addTechnique( technique );
  effect->addParameter( paramInst );
  effect->addParameter( paramInstNormal );
 
  symbol->material()->addParametersToEffect( effect );
 
  Qt3DRender::QMaterial *material = new Qt3DRender::QMaterial;
  material->setEffect( effect );
 
  return material;
}
 
Qt3DRender::QGeometryRenderer *QgsInstancedPoint3DSymbolHandler::renderer( const QgsPoint3DSymbol *symbol, const QVector<QVector3D> &positions )
{
  int count = positions.count();
  int byteCount = positions.count() * sizeof( QVector3D );
  QByteArray ba;
  ba.resize( byteCount );
  memcpy( ba.data(), positions.constData(), byteCount );
 
  Qt3DRender::QBuffer *instanceBuffer = new Qt3DRender::QBuffer();
  instanceBuffer->setData( ba );
 
  Qt3DRender::QAttribute *instanceDataAttribute = new Qt3DRender::QAttribute;
  instanceDataAttribute->setName( QStringLiteral( "pos" ) );
  instanceDataAttribute->setAttributeType( Qt3DRender::QAttribute::VertexAttribute );
  instanceDataAttribute->setVertexBaseType( Qt3DRender::QAttribute::Float );
  instanceDataAttribute->setVertexSize( 3 );
  instanceDataAttribute->setByteOffset( 0 );
  instanceDataAttribute->setDivisor( 1 );
  instanceDataAttribute->setBuffer( instanceBuffer );
  instanceDataAttribute->setCount( count );
  instanceDataAttribute->setByteStride( 3 * sizeof( float ) );
 
  Qt3DRender::QGeometry *geometry = symbolGeometry( symbol->shape(), symbol->shapeProperties() );
  geometry->addAttribute( instanceDataAttribute );
  geometry->setBoundingVolumePositionAttribute( instanceDataAttribute );
 
  Qt3DRender::QGeometryRenderer *renderer = new Qt3DRender::QGeometryRenderer;
  renderer->setGeometry( geometry );
  renderer->setInstanceCount( count );
 
  return renderer;
}
 
Qt3DRender::QGeometry *QgsInstancedPoint3DSymbolHandler::symbolGeometry( QgsPoint3DSymbol::Shape shape, const QVariantMap &shapeProperties )
{
  switch ( shape )
  {
    case QgsPoint3DSymbol::Cylinder:
    {
      float radius = shapeProperties[QStringLiteral( "radius" )].toFloat();
      float length = shapeProperties[QStringLiteral( "length" )].toFloat();
      Qt3DExtras::QCylinderGeometry *g = new Qt3DExtras::QCylinderGeometry;
      //g->setRings(2);  // how many vertices vertically
      //g->setSlices(8); // how many vertices on circumference
      g->setRadius( radius ? radius : 10 );
      g->setLength( length ? length : 10 );
      return g;
    }
 
    case QgsPoint3DSymbol::Sphere:
    {
      float radius = shapeProperties[QStringLiteral( "radius" )].toFloat();
      Qt3DExtras::QSphereGeometry *g = new Qt3DExtras::QSphereGeometry;
      g->setRadius( radius ? radius : 10 );
      return g;
    }
 
    case QgsPoint3DSymbol::Cone:
    {
      float length = shapeProperties[QStringLiteral( "length" )].toFloat();
      float bottomRadius = shapeProperties[QStringLiteral( "bottomRadius" )].toFloat();
      float topRadius = shapeProperties[QStringLiteral( "topRadius" )].toFloat();
      Qt3DExtras::QConeGeometry *g = new Qt3DExtras::QConeGeometry;
      g->setLength( length ? length : 10 );
      g->setBottomRadius( bottomRadius );
      g->setTopRadius( topRadius );
      //g->setHasBottomEndcap(hasBottomEndcap);
      //g->setHasTopEndcap(hasTopEndcap);
      return g;
    }
 
    case QgsPoint3DSymbol::Cube:
    {
      float size = shapeProperties[QStringLiteral( "size" )].toFloat();
      Qt3DExtras::QCuboidGeometry *g = new Qt3DExtras::QCuboidGeometry;
      g->setXExtent( size ? size : 10 );
      g->setYExtent( size ? size : 10 );
      g->setZExtent( size ? size : 10 );
      return g;
    }
 
    case QgsPoint3DSymbol::Torus:
    {
      float radius = shapeProperties[QStringLiteral( "radius" )].toFloat();
      float minorRadius = shapeProperties[QStringLiteral( "minorRadius" )].toFloat();
      Qt3DExtras::QTorusGeometry *g = new Qt3DExtras::QTorusGeometry;
      g->setRadius( radius ? radius : 10 );
      g->setMinorRadius( minorRadius ? minorRadius : 5 );
      return g;
    }
 
    case QgsPoint3DSymbol::Plane:
    {
      float size = shapeProperties[QStringLiteral( "size" )].toFloat();
      Qt3DExtras::QPlaneGeometry *g = new Qt3DExtras::QPlaneGeometry;
      g->setWidth( size ? size : 10 );
      g->setHeight( size ? size : 10 );
      return g;
    }
 
    case QgsPoint3DSymbol::ExtrudedText:
    {
      float depth = shapeProperties[QStringLiteral( "depth" )].toFloat();
      QString text = shapeProperties[QStringLiteral( "text" )].toString();
      Qt3DExtras::QExtrudedTextGeometry *g = new Qt3DExtras::QExtrudedTextGeometry;
      g->setDepth( depth ? depth : 1 );
      g->setText( text );
      return g;
    }
 
    default:
      Q_ASSERT( false );
      return nullptr;
  }
}
 
//* 3D MODEL RENDERING *//
 
 
class QgsModelPoint3DSymbolHandler : public QgsFeature3DHandler
{
  public:
    QgsModelPoint3DSymbolHandler( const QgsPoint3DSymbol *symbol, const QgsFeatureIds &selectedIds )
      : mSymbol( static_cast< QgsPoint3DSymbol * >( symbol->clone() ) )
      , mSelectedIds( selectedIds ) {}
 
    bool prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames ) override;
    void processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context ) override;
 
  private:
 
    static void addSceneEntities( const Qgs3DMapSettings &map, const QVector<QVector3D> &positions, const QgsPoint3DSymbol *symbol, Qt3DCore::QEntity *parent );
    static void addMeshEntities( const Qgs3DMapSettings &map, const QVector<QVector3D> &positions, const QgsPoint3DSymbol *symbol, Qt3DCore::QEntity *parent, bool are_selected );
    static Qt3DCore::QTransform *transform( QVector3D position, const QgsPoint3DSymbol *symbol );
 
    struct PointData
    {
      QVector<QVector3D> positions;  // contains triplets of float x,y,z for each point
    };
 
    void makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected );
 
    // input specific for this class
    std::unique_ptr< QgsPoint3DSymbol > mSymbol;
    // inputs - generic
    QgsFeatureIds mSelectedIds;
 
    // outputs
    PointData outNormal;  
    PointData outSelected;  
};
 
bool QgsModelPoint3DSymbolHandler::prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames )
{
  Q_UNUSED( context )
  Q_UNUSED( attributeNames )
  return true;
}
 
void QgsModelPoint3DSymbolHandler::processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context )
{
  PointData &out = mSelectedIds.contains( feature.id() ) ? outSelected : outNormal;
 
  if ( feature.geometry().isNull() )
    return;
 
  Qgs3DUtils::extractPointPositions( feature, context.map(), mSymbol->altitudeClamping(), out.positions );
}
 
void QgsModelPoint3DSymbolHandler::finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context )
{
  makeEntity( parent, context, outNormal, false );
  makeEntity( parent, context, outSelected, true );
 
  updateZRangeFromPositions( outNormal.positions );
  updateZRangeFromPositions( outSelected.positions );
 
  // the elevation offset is applied separately in QTransform added to sub-entities
  float symbolHeight = mSymbol->transform().data()[13];
  mZMin += symbolHeight;
  mZMax += symbolHeight;
}
 
void QgsModelPoint3DSymbolHandler::makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected )
{
  if ( selected )
  {
    addMeshEntities( context.map(), out.positions, mSymbol.get(), parent, true );
  }
  else
  {
    //  "overwriteMaterial" is a legacy setting indicating that non-embedded material should be used
    if ( mSymbol->shapeProperties()[QStringLiteral( "overwriteMaterial" )].toBool()
         || ( mSymbol->material() && mSymbol->material()->type() != QLatin1String( "null" ) ) )
    {
      addMeshEntities( context.map(), out.positions, mSymbol.get(), parent, false );
    }
    else
    {
      addSceneEntities( context.map(), out.positions, mSymbol.get(), parent );
    }
  }
}
 
 
 
void QgsModelPoint3DSymbolHandler::addSceneEntities( const Qgs3DMapSettings &map, const QVector<QVector3D> &positions, const QgsPoint3DSymbol *symbol, Qt3DCore::QEntity *parent )
{
  Q_UNUSED( map )
  for ( const QVector3D &position : positions )
  {
    const QString source = QgsApplication::instance()->sourceCache()->localFilePath( symbol->shapeProperties()[QStringLiteral( "model" )].toString() );
    // if the source is remote, the Qgs3DMapScene will take care of refreshing this 3D symbol when the source is fetched
    if ( !source.isEmpty() )
    {
      // build the entity
      Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
 
      QUrl url = QUrl::fromLocalFile( source );
      Qt3DRender::QSceneLoader *modelLoader = new Qt3DRender::QSceneLoader;
      modelLoader->setSource( url );
 
      entity->addComponent( modelLoader );
      entity->addComponent( transform( position, symbol ) );
      entity->setParent( parent );
 
// cppcheck wrongly believes entity will leak
// cppcheck-suppress memleak
    }
  }
}
 
void QgsModelPoint3DSymbolHandler::addMeshEntities( const Qgs3DMapSettings &map, const QVector<QVector3D> &positions, const QgsPoint3DSymbol *symbol, Qt3DCore::QEntity *parent, bool are_selected )
{
  if ( positions.empty() )
    return;
 
  // build the default material
  QgsMaterialContext materialContext;
  materialContext.setIsSelected( are_selected );
  materialContext.setSelectionColor( map.selectionColor() );
  Qt3DRender::QMaterial *mat = symbol->material()->toMaterial( QgsMaterialSettingsRenderingTechnique::Triangles, materialContext );
 
  // get nodes
  for ( const QVector3D &position : positions )
  {
    const QString source = QgsApplication::instance()->sourceCache()->localFilePath( symbol->shapeProperties()[QStringLiteral( "model" )].toString() );
    if ( !source.isEmpty() )
    {
      // build the entity
      Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
 
      QUrl url = QUrl::fromLocalFile( source );
      Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh;
      mesh->setSource( url );
 
      entity->addComponent( mesh );
      entity->addComponent( mat );
      entity->addComponent( transform( position, symbol ) );
      entity->setParent( parent );
 
// cppcheck wrongly believes entity will leak
// cppcheck-suppress memleak
    }
  }
}
 
Qt3DCore::QTransform *QgsModelPoint3DSymbolHandler::transform( QVector3D position, const QgsPoint3DSymbol *symbol )
{
  Qt3DCore::QTransform *tr = new Qt3DCore::QTransform;
  tr->setMatrix( symbol->transform() );
  tr->setTranslation( position + tr->translation() );
  return tr;
}
 
// --------------
 
//* BILLBOARD RENDERING *//
 
class QgsPoint3DBillboardSymbolHandler : public QgsFeature3DHandler
{
  public:
    QgsPoint3DBillboardSymbolHandler( const QgsPoint3DSymbol *symbol, const QgsFeatureIds &selectedIds )
      : mSymbol( static_cast< QgsPoint3DSymbol * >( symbol->clone() ) )
      , mSelectedIds( selectedIds ) {}
 
    bool prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames ) override;
    void processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context ) override;
 
  private:
 
    struct PointData
    {
      QVector<QVector3D> positions;  // contains triplets of float x,y,z for each point
    };
 
    void makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected );
 
    // input specific for this class
    std::unique_ptr< QgsPoint3DSymbol > mSymbol;
    // inputs - generic
    QgsFeatureIds mSelectedIds;
 
    // outputs
    PointData outNormal;  
    PointData outSelected;  
};
 
bool QgsPoint3DBillboardSymbolHandler::prepare( const Qgs3DRenderContext &context, QSet<QString> &attributeNames )
{
  Q_UNUSED( context )
  Q_UNUSED( attributeNames )
  return true;
}
 
void QgsPoint3DBillboardSymbolHandler::processFeature( const QgsFeature &feature, const Qgs3DRenderContext &context )
{
  PointData &out = mSelectedIds.contains( feature.id() ) ? outSelected : outNormal;
 
  if ( feature.geometry().isNull() )
    return;
 
  Qgs3DUtils::extractPointPositions( feature, context.map(), mSymbol->altitudeClamping(), out.positions );
}
 
void QgsPoint3DBillboardSymbolHandler::finalize( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context )
{
  makeEntity( parent, context, outNormal, false );
  makeEntity( parent, context, outSelected, true );
 
  updateZRangeFromPositions( outNormal.positions );
  updateZRangeFromPositions( outSelected.positions );
 
  // the elevation offset is applied externally through a QTransform of QEntity so let's account for it
  float billboardHeight = mSymbol->transform().data()[13];
  mZMin += billboardHeight;
  mZMax += billboardHeight;
}
 
void QgsPoint3DBillboardSymbolHandler::makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, PointData &out, bool selected )
{
  // Billboard Geometry
  QgsBillboardGeometry *billboardGeometry = new QgsBillboardGeometry();
  billboardGeometry->setPoints( out.positions );
 
  // Billboard Geometry Renderer
  Qt3DRender::QGeometryRenderer *billboardGeometryRenderer = new Qt3DRender::QGeometryRenderer;
  billboardGeometryRenderer->setPrimitiveType( Qt3DRender::QGeometryRenderer::Points );
  billboardGeometryRenderer->setGeometry( billboardGeometry );
  billboardGeometryRenderer->setVertexCount( billboardGeometry->count() );
 
  // Billboard Material
  QgsPoint3DBillboardMaterial *billboardMaterial = new QgsPoint3DBillboardMaterial();
  QgsMarkerSymbol *symbol = mSymbol->billboardSymbol();
 
  if ( symbol )
  {
    billboardMaterial->setTexture2DFromSymbol( symbol, context.map(), selected );
  }
  else
  {
    billboardMaterial->useDefaultSymbol( context.map(), selected );
  }
 
  // Billboard Transform
  Qt3DCore::QTransform *billboardTransform = new Qt3DCore::QTransform();
  billboardTransform->setMatrix( mSymbol->billboardTransform() );
 
  // Build the entity
  Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
 
  entity->addComponent( billboardMaterial );
  entity->addComponent( billboardTransform );
  entity->addComponent( billboardGeometryRenderer );
  entity->setParent( parent );
 
// cppcheck wrongly believes entity will leak
// cppcheck-suppress memleak
}
 
 
namespace Qgs3DSymbolImpl
{
 
  QgsFeature3DHandler *handlerForPoint3DSymbol( QgsVectorLayer *layer, const QgsAbstract3DSymbol *symbol )
  {
    const QgsPoint3DSymbol *pointSymbol = dynamic_cast< const QgsPoint3DSymbol * >( symbol );
    if ( !pointSymbol )
      return nullptr;
 
    if ( pointSymbol->shape() == QgsPoint3DSymbol::Model )
      return new QgsModelPoint3DSymbolHandler( pointSymbol, layer->selectedFeatureIds() );
    // Add proper handler for billboard
    else if ( pointSymbol->shape() == QgsPoint3DSymbol::Billboard )
      return new QgsPoint3DBillboardSymbolHandler( pointSymbol, layer->selectedFeatureIds() );
    else
      return new QgsInstancedPoint3DSymbolHandler( pointSymbol, layer->selectedFeatureIds() );
  }
 
  Qt3DCore::QEntity *entityForPoint3DSymbol( const Qgs3DMapSettings &map, QgsVectorLayer *layer, const QgsPoint3DSymbol &symbol )
  {
    QgsFeature3DHandler *handler = handlerForPoint3DSymbol( layer, &symbol );
    Qt3DCore::QEntity *e = entityFromHandler( handler, map, layer );
    delete handler;
    return e;
  }
}