qgs3dmapscene.cpp

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/***************************************************************************
  qgs3dmapscene.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 "qgs3dmapscene.h"
 
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QMesh>
#include <Qt3DRender/QRenderSettings>
#include <Qt3DRender/QSceneLoader>
#include <Qt3DExtras/QForwardRenderer>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QPhongAlphaMaterial>
#include <Qt3DExtras/QDiffuseSpecularMaterial>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DLogic/QFrameAction>
#include <Qt3DRender/QEffect>
#include <Qt3DRender/QTechnique>
#include <Qt3DRender/QRenderPass>
#include <Qt3DRender/QRenderState>
#include <Qt3DRender/QCullFace>
#include <Qt3DRender/QDepthTest>
#include <QSurface>
#include <QUrl>
#include <QtMath>
 
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QTimer>
 
#include "qgs3daxis.h"
#include "qgslogger.h"
#include "qgsapplication.h"
#include "qgsaabb.h"
#include "qgsabstract3dengine.h"
#include "qgs3dmapsettings.h"
#include "qgs3dutils.h"
#include "qgsabstract3drenderer.h"
#include "qgscameracontroller.h"
#include "qgschunkedentity.h"
#include "qgschunknode.h"
#include "qgseventtracing.h"
#include "qgsmaterial.h"
#include "qgsmeshlayer.h"
#include "qgsmeshlayer3drenderer.h"
#include "qgspoint3dsymbol.h"
#include "qgsrulebased3drenderer.h"
#include "qgspointcloudlayer.h"
#include "qgspointcloudlayer3drenderer.h"
#include "qgssourcecache.h"
#include "qgsterrainentity.h"
#include "qgsterraingenerator.h"
#include "qgstiledscenelayer.h"
#include "qgstiledscenelayer3drenderer.h"
#include "qgsdirectionallightsettings.h"
#include "qgsvectorlayer.h"
#include "qgsvectorlayer3drenderer.h"
#include "qgspoint3dbillboardmaterial.h"
#include "qgsmaplayertemporalproperties.h"
#include "qgsmaplayerelevationproperties.h"
#include "qgslinematerial_p.h"
#include "qgs3dsceneexporter.h"
#include "qgs3dmapexportsettings.h"
#include "qgsmessageoutput.h"
#include "qgsframegraph.h"
 
#include "qgsskyboxentity.h"
#include "qgsskyboxsettings.h"
 
#include "qgswindow3dengine.h"
#include "qgspointcloudlayer.h"
 
std::function< QMap< QString, Qgs3DMapScene * >() > Qgs3DMapScene::sOpenScenesFunction = [] { return QMap< QString, Qgs3DMapScene * >(); };
 
Qgs3DMapScene::Qgs3DMapScene( Qgs3DMapSettings &map, QgsAbstract3DEngine *engine )
  : mMap( map )
  , mEngine( engine )
{
 
  connect( &map, &Qgs3DMapSettings::backgroundColorChanged, this, &Qgs3DMapScene::onBackgroundColorChanged );
  onBackgroundColorChanged();
 
  // The default render policy in Qt3D is "Always" - i.e. the 3D map scene gets refreshed up to 60 fps
  // even if there's no change. Switching to "on demand" should only re-render when something has changed
  // and we save quite a lot of resources
  mEngine->renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::OnDemand );
 
  QRect viewportRect( QPoint( 0, 0 ), mEngine->size() );
 
  // Camera
  float aspectRatio = ( float )viewportRect.width() / viewportRect.height();
  mEngine->camera()->lens()->setPerspectiveProjection( mMap.fieldOfView(), aspectRatio, 10.f, 10000.0f );
 
  mFrameAction = new Qt3DLogic::QFrameAction();
  connect( mFrameAction, &Qt3DLogic::QFrameAction::triggered,
           this, &Qgs3DMapScene::onFrameTriggered );
  addComponent( mFrameAction ); // takes ownership
 
  // Camera controlling
  mCameraController = new QgsCameraController( this ); // attaches to the scene
  mCameraController->resetView( 1000 );
 
  addCameraViewCenterEntity( mEngine->camera() );
  addCameraRotationCenterEntity( mCameraController );
  updateLights();
 
  // create terrain entity
 
  createTerrainDeferred();
  connect( &map, &Qgs3DMapSettings::extentChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::terrainGeneratorChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::terrainVerticalScaleChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::mapTileResolutionChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::maxTerrainScreenErrorChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::maxTerrainGroundErrorChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::terrainShadingChanged, this, &Qgs3DMapScene::createTerrain );
  connect( &map, &Qgs3DMapSettings::lightSourcesChanged, this, &Qgs3DMapScene::updateLights );
  connect( &map, &Qgs3DMapSettings::showLightSourceOriginsChanged, this, &Qgs3DMapScene::updateLights );
  connect( &map, &Qgs3DMapSettings::fieldOfViewChanged, this, &Qgs3DMapScene::updateCameraLens );
  connect( &map, &Qgs3DMapSettings::projectionTypeChanged, this, &Qgs3DMapScene::updateCameraLens );
  connect( &map, &Qgs3DMapSettings::skyboxSettingsChanged, this, &Qgs3DMapScene::onSkyboxSettingsChanged );
  connect( &map, &Qgs3DMapSettings::shadowSettingsChanged, this, &Qgs3DMapScene::onShadowSettingsChanged );
  connect( &map, &Qgs3DMapSettings::ambientOcclusionSettingsChanged, this, &Qgs3DMapScene::onAmbientOcclusionSettingsChanged );
  connect( &map, &Qgs3DMapSettings::eyeDomeLightingEnabledChanged, this, &Qgs3DMapScene::onEyeDomeShadingSettingsChanged );
  connect( &map, &Qgs3DMapSettings::eyeDomeLightingStrengthChanged, this, &Qgs3DMapScene::onEyeDomeShadingSettingsChanged );
  connect( &map, &Qgs3DMapSettings::eyeDomeLightingDistanceChanged, this, &Qgs3DMapScene::onEyeDomeShadingSettingsChanged );
  connect( &map, &Qgs3DMapSettings::debugShadowMapSettingsChanged, this, &Qgs3DMapScene::onDebugShadowMapSettingsChanged );
  connect( &map, &Qgs3DMapSettings::debugDepthMapSettingsChanged, this, &Qgs3DMapScene::onDebugDepthMapSettingsChanged );
  connect( &map, &Qgs3DMapSettings::fpsCounterEnabledChanged, this, &Qgs3DMapScene::fpsCounterEnabledChanged );
  connect( &map, &Qgs3DMapSettings::cameraMovementSpeedChanged, this, &Qgs3DMapScene::onCameraMovementSpeedChanged );
  connect( &map, &Qgs3DMapSettings::cameraNavigationModeChanged, this, &Qgs3DMapScene::onCameraNavigationModeChanged );
  connect( &map, &Qgs3DMapSettings::debugOverlayEnabledChanged, this, &Qgs3DMapScene::onDebugOverlayEnabledChanged );
 
  connect( &map, &Qgs3DMapSettings::axisSettingsChanged, this, &Qgs3DMapScene::on3DAxisSettingsChanged );
 
  connect( QgsApplication::sourceCache(), &QgsSourceCache::remoteSourceFetched, this, [ = ]( const QString & url )
  {
    const QList<QgsMapLayer *> modelVectorLayers = mModelVectorLayers;
    for ( QgsMapLayer *layer : modelVectorLayers )
    {
      QgsAbstract3DRenderer *renderer = layer->renderer3D();
      if ( renderer )
      {
        if ( renderer->type() == QLatin1String( "vector" ) )
        {
          const QgsPoint3DSymbol *pointSymbol = static_cast< const QgsPoint3DSymbol * >( static_cast< QgsVectorLayer3DRenderer *>( renderer )->symbol() );
          if ( pointSymbol->shapeProperty( QStringLiteral( "model" ) ).toString() == url )
          {
            removeLayerEntity( layer );
            addLayerEntity( layer );
          }
        }
        else if ( renderer->type() == QLatin1String( "rulebased" ) )
        {
          const QgsRuleBased3DRenderer::RuleList rules = static_cast< QgsRuleBased3DRenderer *>( renderer )->rootRule()->descendants();
          for ( auto rule : rules )
          {
            const QgsPoint3DSymbol *pointSymbol = dynamic_cast< const QgsPoint3DSymbol * >( rule->symbol() );
            if ( pointSymbol->shapeProperty( QStringLiteral( "model" ) ).toString() == url )
            {
              removeLayerEntity( layer );
              addLayerEntity( layer );
              break;
            }
          }
        }
      }
    }
  } );
 
  // listen to changes of layers in order to add/remove 3D renderer entities
  connect( &map, &Qgs3DMapSettings::layersChanged, this, &Qgs3DMapScene::onLayersChanged );
 
  connect( mCameraController, &QgsCameraController::cameraChanged, this, &Qgs3DMapScene::onCameraChanged );
  connect( mEngine, &QgsAbstract3DEngine::sizeChanged, this, &Qgs3DMapScene::onCameraChanged );
 
  onSkyboxSettingsChanged();
 
  // force initial update of chunked entities
  onCameraChanged();
  // force initial update of eye dome shading
  onEyeDomeShadingSettingsChanged();
  // force initial update of debugging setting of preview quads
  onDebugShadowMapSettingsChanged();
  onDebugDepthMapSettingsChanged();
  // force initial update of ambient occlusion settings
  onAmbientOcclusionSettingsChanged();
 
  mCameraController->setCameraNavigationMode( mMap.cameraNavigationMode() );
  onCameraMovementSpeedChanged();
 
  on3DAxisSettingsChanged();
}
 
void Qgs3DMapScene::viewZoomFull()
{
  const QgsDoubleRange yRange = elevationRange();
  const QgsRectangle extent = sceneExtent();
  const double side = std::max( extent.width(), extent.height() );
  double d = side / 2 / std::tan( cameraController()->camera()->fieldOfView() / 2 * M_PI / 180 );
  d += yRange.isInfinite() ?  0. : yRange.upper();
  mCameraController->resetView( static_cast< float >( d ) );
  return;
}
 
void Qgs3DMapScene::setViewFrom2DExtent( const QgsRectangle &extent )
{
  QgsPointXY center = extent.center();
  QgsVector3D centerWorld = mMap.mapToWorldCoordinates( QVector3D( center.x(), center.y(), 0 ) );
  QgsVector3D p1 = mMap.mapToWorldCoordinates( QVector3D( extent.xMinimum(), extent.yMinimum(), 0 ) );
  QgsVector3D p2 = mMap.mapToWorldCoordinates( QVector3D( extent.xMaximum(), extent.yMaximum(), 0 ) );
 
  float xSide = std::abs( p1.x() - p2.x() );
  float ySide = std::abs( p1.z() - p2.z() );
  if ( xSide < ySide )
  {
    float fov = 2 * std::atan( std::tan( qDegreesToRadians( cameraController()->camera()->fieldOfView() ) / 2 ) * cameraController()->camera()->aspectRatio() );
    float r = xSide / 2.0f / std::tan( fov / 2.0f );
    mCameraController->setViewFromTop( centerWorld.x(), centerWorld.z(), r );
  }
  else
  {
    float fov = qDegreesToRadians( cameraController()->camera()->fieldOfView() );
    float r = ySide / 2.0f / std::tan( fov / 2.0f );
    mCameraController->setViewFromTop( centerWorld.x(), centerWorld.z(), r );
  }
}
 
QVector<QgsPointXY> Qgs3DMapScene::viewFrustum2DExtent() const
{
  Qt3DRender::QCamera *camera = mCameraController->camera();
  QVector<QgsPointXY> extent;
  QVector<int> pointsOrder = { 0, 1, 3, 2 };
  for ( int i : pointsOrder )
  {
    const QPoint p( ( ( i >> 0 ) & 1 ) ? 0 : mEngine->size().width(), ( ( i >> 1 ) & 1 ) ? 0 : mEngine->size().height() );
    QgsRay3D ray = Qgs3DUtils::rayFromScreenPoint( p, mEngine->size(), camera );
    QVector3D dir = ray.direction();
    if ( dir.y() == 0.0 )
      dir.setY( 0.000001 );
    double t = - ray.origin().y() / dir.y();
    if ( t < 0 )
    {
      // If the projected point is on the back of the camera we choose the farthest point in the front
      t = camera->farPlane();
    }
    else
    {
      // If the projected point is on the front of the camera we choose the closest between it and farthest point in the front
      t = std::min<float>( t, camera->farPlane() );
    }
    QVector3D planePoint = ray.origin() + t * dir;
    QgsVector3D pMap = mMap.worldToMapCoordinates( planePoint );
    extent.push_back( QgsPointXY( pMap.x(), pMap.y() ) );
  }
  return extent;
}
 
int Qgs3DMapScene::terrainPendingJobsCount() const
{
  return mTerrain ? mTerrain->pendingJobsCount() : 0;
}
 
int Qgs3DMapScene::totalPendingJobsCount() const
{
  int count = 0;
  for ( Qgs3DMapSceneEntity *entity : std::as_const( mSceneEntities ) )
    count += entity->pendingJobsCount();
  return count;
}
 
float Qgs3DMapScene::worldSpaceError( float epsilon, float distance ) const
{
  Qt3DRender::QCamera *camera = mCameraController->camera();
  float fov = camera->fieldOfView();
  const QSize size = mEngine->size();
  float screenSizePx = std::max( size.width(), size.height() ); // TODO: is this correct?
 
  // see Qgs3DUtils::screenSpaceError() for the inverse calculation (world space error to screen space error)
  // with explanation of the math.
  float frustumWidthAtDistance = 2 * distance * tan( fov / 2 );
  float err = frustumWidthAtDistance * epsilon / screenSizePx;
  return err;
}
 
void Qgs3DMapScene::onCameraChanged()
{
  if ( mMap.projectionType() == Qt3DRender::QCameraLens::OrthographicProjection )
  {
    QRect viewportRect( QPoint( 0, 0 ), mEngine->size() );
    const float viewWidthFromCenter = mCameraController->distance();
    const float viewHeightFromCenter =  viewportRect.height() * viewWidthFromCenter / viewportRect.width();
    mEngine->camera()->lens()->setOrthographicProjection( -viewWidthFromCenter, viewWidthFromCenter, -viewHeightFromCenter, viewHeightFromCenter, mEngine->camera()->nearPlane(), mEngine->camera()->farPlane() );
  }
 
  updateScene( true );
  bool changedCameraPlanes = updateCameraNearFarPlanes();
 
  if ( changedCameraPlanes )
  {
    // repeat update of entities - because we have updated camera's near/far planes,
    // the active nodes may have changed as well
    updateScene( true );
    updateCameraNearFarPlanes();
  }
 
  onShadowSettingsChanged();
 
  QVector<QgsPointXY> extent2D = viewFrustum2DExtent();
  emit viewed2DExtentFrom3DChanged( extent2D );
}
 
void Qgs3DMapScene::updateScene( bool forceUpdate )
{
  if ( !mSceneUpdatesEnabled )
  {
    QgsDebugMsgLevel( "Scene update skipped", 2 );
    return;
  }
 
  if ( forceUpdate )
    QgsEventTracing::addEvent( QgsEventTracing::Instant, QStringLiteral( "3D" ), QStringLiteral( "Update Scene" ) );
 
  Qgs3DMapSceneEntity::SceneContext sceneContext;
  Qt3DRender::QCamera *camera = mEngine->camera();
  sceneContext.cameraFov = camera->fieldOfView();
  sceneContext.cameraPos = camera->position();
  const QSize size = mEngine->size();
  sceneContext.screenSizePx = std::max( size.width(), size.height() ); // TODO: is this correct?
  sceneContext.viewProjectionMatrix = camera->projectionMatrix() * camera->viewMatrix();
 
 
  for ( Qgs3DMapSceneEntity *entity : std::as_const( mSceneEntities ) )
  {
    if ( forceUpdate || ( entity->isEnabled() && entity->needsUpdate() ) )
    {
      entity->handleSceneUpdate( sceneContext );
      if ( entity->hasReachedGpuMemoryLimit() )
        emit gpuMemoryLimitReached();
    }
  }
 
  updateSceneState();
}
 
bool Qgs3DMapScene::updateCameraNearFarPlanes()
{
  // Update near and far plane from the terrain.
  // this needs to be done with great care as we have kind of circular dependency here:
  // active nodes are culled based on the current frustum (which involves near + far plane)
  // and then based on active nodes we set near and far plane.
  //
  // All of this is just heuristics assuming that all other stuff is being rendered somewhere
  // around the area where the terrain is.
  //
  // Near/far plane is setup in order to make best use of the depth buffer to avoid:
  // 1. precision errors - if the range is too great
  // 2. unwanted clipping of scene - if the range is too small
 
  Qt3DRender::QCamera *camera = cameraController()->camera();
  QMatrix4x4 viewMatrix = camera->viewMatrix();
  float fnear = 1e9;
  float ffar = 0;
 
  // Iterate all scene entities to make sure that they will not get
  // clipped by the near or far plane
  for ( Qgs3DMapSceneEntity *se : std::as_const( mSceneEntities ) )
  {
    const QgsRange<float> depthRange = se->getNearFarPlaneRange( viewMatrix );
 
    fnear = std::min( fnear, depthRange.lower() );
    ffar = std::max( ffar, depthRange.upper() );
  }
 
  if ( fnear < 1 )
    fnear = 1;  // does not really make sense to use negative far plane (behind camera)
 
  // the update didn't work out... this can happen if the scene does not contain
  // any Qgs3DMapSceneEntity. Use the scene extent to compute near and far planes
  // as a fallback.
  if ( fnear == 1e9 && ffar == 0 )
  {
    QgsDoubleRange sceneYRange = elevationRange();
    sceneYRange = sceneYRange.isInfinite() ? QgsDoubleRange( 0.0, 0.0 ) : sceneYRange;
    const QgsAABB sceneBbox = Qgs3DUtils::mapToWorldExtent( mMap.extent(), sceneYRange.lower(), sceneYRange.upper(), mMap.origin() );
    Qgs3DUtils::computeBoundingBoxNearFarPlanes( sceneBbox, viewMatrix, fnear, ffar );
  }
 
  // when zooming in a lot, fnear can become smaller than ffar. This should not happen
  if ( fnear > ffar )
    std::swap( fnear, ffar );
 
  // set near/far plane - with some tolerance in front/behind expected near/far planes
  float newFar = ffar * 2;
  float newNear = fnear / 2;
  if ( !qgsFloatNear( newFar, camera->farPlane() ) || !qgsFloatNear( newNear, camera->nearPlane() ) )
  {
    camera->setFarPlane( newFar );
    camera->setNearPlane( newNear );
    return true;
  }
 
  return false;
}
 
void Qgs3DMapScene::onFrameTriggered( float dt )
{
  mCameraController->frameTriggered( dt );
 
  updateScene();
 
  // lock changing the FPS counter to 5 fps
  static int frameCount = 0;
  static float accumulatedTime = 0.0f;
 
  if ( !mMap.isFpsCounterEnabled() )
  {
    frameCount = 0;
    accumulatedTime = 0;
    return;
  }
 
  frameCount++;
  accumulatedTime += dt;
  if ( accumulatedTime >= 0.2f )
  {
    float fps = ( float )frameCount / accumulatedTime;
    frameCount = 0;
    accumulatedTime = 0.0f;
    emit fpsCountChanged( fps );
  }
}
 
void Qgs3DMapScene::createTerrain()
{
  if ( mTerrain )
  {
    mSceneEntities.removeOne( mTerrain );
 
    delete mTerrain;
    mTerrain = nullptr;
  }
 
  if ( !mTerrainUpdateScheduled )
  {
    // defer re-creation of terrain: there may be multiple invocations of this slot, so create the new entity just once
    QTimer::singleShot( 0, this, &Qgs3DMapScene::createTerrainDeferred );
    mTerrainUpdateScheduled = true;
    setSceneState( Updating );
  }
  else
  {
    emit terrainEntityChanged();
  }
}
 
void Qgs3DMapScene::createTerrainDeferred()
{
  if ( mMap.terrainRenderingEnabled() && mMap.terrainGenerator() )
  {
    double tile0width = mMap.terrainGenerator()->rootChunkExtent().width();
    int maxZoomLevel = Qgs3DUtils::maxZoomLevel( tile0width, mMap.mapTileResolution(), mMap.maxTerrainGroundError() );
    QgsAABB rootBbox = mMap.terrainGenerator()->rootChunkBbox( mMap );
    float rootError = mMap.terrainGenerator()->rootChunkError( mMap );
    const QgsAABB clippingBbox = Qgs3DUtils::mapToWorldExtent( mMap.extent(), rootBbox.zMin, rootBbox.zMax, mMap.origin() );
    mMap.terrainGenerator()->setupQuadtree( rootBbox, rootError, maxZoomLevel, clippingBbox );
 
    mTerrain = new QgsTerrainEntity( &mMap );
    mTerrain->setParent( this );
    mTerrain->setShowBoundingBoxes( mMap.showTerrainBoundingBoxes() );
 
    mSceneEntities << mTerrain;
 
    connect( mTerrain, &QgsChunkedEntity::pendingJobsCountChanged, this, &Qgs3DMapScene::totalPendingJobsCountChanged );
    connect( mTerrain, &QgsTerrainEntity::pendingJobsCountChanged, this, &Qgs3DMapScene::terrainPendingJobsCountChanged );
    connect( mTerrain, &Qgs3DMapSceneEntity::newEntityCreated, this, [this]( Qt3DCore::QEntity * entity )
    {
      // enable clipping on the terrain if necessary
      handleClippingOnEntity( entity );
    } );
  }
  else
  {
    mTerrain = nullptr;
  }
 
  // make sure that renderers for layers are re-created as well
  const QList<QgsMapLayer *> layers = mMap.layers();
  for ( QgsMapLayer *layer : layers )
  {
    // remove old entity - if any
    removeLayerEntity( layer );
 
    // add new entity - if any 3D renderer
    addLayerEntity( layer );
  }
 
  emit terrainEntityChanged();
  onCameraChanged();  // force update of the new terrain
  mTerrainUpdateScheduled = false;
}
 
void Qgs3DMapScene::onBackgroundColorChanged()
{
  mEngine->setClearColor( mMap.backgroundColor() );
}
 
void Qgs3DMapScene::updateLights()
{
  for ( Qt3DCore::QEntity *entity : std::as_const( mLightEntities ) )
    entity->deleteLater();
  mLightEntities.clear();
 
  const QList< QgsLightSource * > newLights = mMap.lightSources();
  for ( const QgsLightSource *source : newLights )
  {
    mLightEntities.append( source->createEntity( mMap, this ) );
  }
 
  onShadowSettingsChanged();
}
 
void Qgs3DMapScene::updateCameraLens()
{
  mEngine->camera()->lens()->setFieldOfView( mMap.fieldOfView() );
  mEngine->camera()->lens()->setProjectionType( mMap.projectionType() );
  onCameraChanged();
}
 
void Qgs3DMapScene::onLayerRenderer3DChanged()
{
  QgsMapLayer *layer = qobject_cast<QgsMapLayer *>( sender() );
  Q_ASSERT( layer );
 
  // remove old entity - if any
  removeLayerEntity( layer );
 
  // add new entity - if any 3D renderer
  addLayerEntity( layer );
}
 
void Qgs3DMapScene::onLayersChanged()
{
  QSet<QgsMapLayer *> layersBefore = qgis::listToSet( mLayerEntities.keys() );
  QList<QgsMapLayer *> layersAdded;
  const QList<QgsMapLayer *> layers = mMap.layers();
  for ( QgsMapLayer *layer : layers )
  {
    if ( !layersBefore.contains( layer ) )
    {
      layersAdded << layer;
    }
    else
    {
      layersBefore.remove( layer );
    }
  }
 
  // what is left in layersBefore are layers that have been removed
  for ( QgsMapLayer *layer : std::as_const( layersBefore ) )
  {
    removeLayerEntity( layer );
  }
 
  for ( QgsMapLayer *layer : std::as_const( layersAdded ) )
  {
    addLayerEntity( layer );
  }
}
 
void Qgs3DMapScene::updateTemporal()
{
  const QList<QgsMapLayer * > layers = mLayerEntities.keys();
  for ( QgsMapLayer *layer : layers )
  {
    if ( QgsMapLayerTemporalProperties *temporalProperties = layer->temporalProperties() )
    {
      if ( temporalProperties->isActive() )
      {
        removeLayerEntity( layer );
        addLayerEntity( layer );
      }
    }
  }
}
 
void Qgs3DMapScene::addLayerEntity( QgsMapLayer *layer )
{
  bool needsSceneUpdate = false;
  QgsAbstract3DRenderer *renderer = layer->renderer3D();
  if ( renderer )
  {
    // Fix vector layer's renderer to make sure the renderer is pointing to its layer.
    // It has happened before that renderer pointed to a different layer (probably after copying a style).
    // This is a bit of a hack and it should be handled in QgsMapLayer::setRenderer3D() but in qgis_core
    // the vector layer 3D renderer classes are not available.
    if ( layer->type() == Qgis::LayerType::Vector &&
         ( renderer->type() == QLatin1String( "vector" ) || renderer->type() == QLatin1String( "rulebased" ) ) )
    {
      static_cast<QgsAbstractVectorLayer3DRenderer *>( renderer )->setLayer( static_cast<QgsVectorLayer *>( layer ) );
      if ( renderer->type() == QLatin1String( "vector" ) )
      {
        QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
        if ( vlayer->geometryType() == Qgis::GeometryType::Point )
        {
          const QgsPoint3DSymbol *pointSymbol = static_cast< const QgsPoint3DSymbol * >( static_cast< QgsVectorLayer3DRenderer *>( renderer )->symbol() );
          if ( pointSymbol->shape() == Qgis::Point3DShape::Model )
          {
            mModelVectorLayers.append( layer );
          }
        }
      }
      else if ( renderer->type() == QLatin1String( "rulebased" ) )
      {
        const QgsRuleBased3DRenderer::RuleList rules = static_cast< QgsRuleBased3DRenderer *>( renderer )->rootRule()->descendants();
        for ( auto rule : rules )
        {
          const QgsPoint3DSymbol *pointSymbol = dynamic_cast< const QgsPoint3DSymbol * >( rule->symbol() );
          if ( pointSymbol && pointSymbol->shape() == Qgis::Point3DShape::Model )
          {
            mModelVectorLayers.append( layer );
            break;
          }
        }
      }
    }
    else if ( layer->type() == Qgis::LayerType::Mesh && renderer->type() == QLatin1String( "mesh" ) )
    {
      QgsMeshLayer3DRenderer *meshRenderer = static_cast<QgsMeshLayer3DRenderer *>( renderer );
      meshRenderer->setLayer( static_cast<QgsMeshLayer *>( layer ) );
 
      // Before entity creation, set the maximum texture size
      // Not very clean, but for now, only place found in the workflow to do that simple
      QgsMesh3DSymbol *sym = meshRenderer->symbol()->clone();
      sym->setMaximumTextureSize( maximumTextureSize() );
      meshRenderer->setSymbol( sym );
    }
    else if ( layer->type() == Qgis::LayerType::PointCloud && renderer->type() == QLatin1String( "pointcloud" ) )
    {
      QgsPointCloudLayer3DRenderer *pointCloudRenderer = static_cast<QgsPointCloudLayer3DRenderer *>( renderer );
      pointCloudRenderer->setLayer( static_cast<QgsPointCloudLayer *>( layer ) );
    }
    else if ( layer->type() == Qgis::LayerType::TiledScene && renderer->type() == QLatin1String( "tiledscene" ) )
    {
      QgsTiledSceneLayer3DRenderer *tiledSceneRenderer = static_cast<QgsTiledSceneLayer3DRenderer *>( renderer );
      tiledSceneRenderer->setLayer( static_cast<QgsTiledSceneLayer *>( layer ) );
    }
 
    Qt3DCore::QEntity *newEntity = renderer->createEntity( &mMap );
    if ( newEntity )
    {
      newEntity->setParent( this );
      mLayerEntities.insert( layer, newEntity );
 
      finalizeNewEntity( newEntity );
 
      if ( Qgs3DMapSceneEntity *sceneNewEntity = qobject_cast<Qgs3DMapSceneEntity *>( newEntity ) )
      {
        needsSceneUpdate = true;
        mSceneEntities.append( sceneNewEntity );
 
        connect( sceneNewEntity, &Qgs3DMapSceneEntity::newEntityCreated, this, [this]( Qt3DCore::QEntity * entity )
        {
          finalizeNewEntity( entity );
          // this ensures to update the near/far planes with the exact bounding box of the new entity.
          updateCameraNearFarPlanes();
        } );
 
        connect( sceneNewEntity, &Qgs3DMapSceneEntity::pendingJobsCountChanged, this, &Qgs3DMapScene::totalPendingJobsCountChanged );
      }
    }
  }
 
  if ( needsSceneUpdate )
    onCameraChanged();   // needed for chunked entities
 
  connect( layer, &QgsMapLayer::request3DUpdate, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
 
  if ( layer->type() == Qgis::LayerType::Vector )
  {
    QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
    connect( vlayer, &QgsVectorLayer::selectionChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
    connect( vlayer, &QgsVectorLayer::layerModified, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
  }
 
  if ( layer->type() == Qgis::LayerType::Mesh )
  {
    connect( layer, &QgsMapLayer::rendererChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
  }
 
  if ( layer->type() == Qgis::LayerType::PointCloud )
  {
    QgsPointCloudLayer *pclayer = qobject_cast<QgsPointCloudLayer *>( layer );
    connect( pclayer, &QgsPointCloudLayer::renderer3DChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
    connect( pclayer, &QgsPointCloudLayer::subsetStringChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
  }
}
 
void Qgs3DMapScene::removeLayerEntity( QgsMapLayer *layer )
{
  Qt3DCore::QEntity *entity = mLayerEntities.take( layer );
 
  if ( Qgs3DMapSceneEntity *sceneEntity = qobject_cast<Qgs3DMapSceneEntity *>( entity ) )
  {
    mSceneEntities.removeOne( sceneEntity );
  }
 
  if ( entity )
    entity->deleteLater();
 
  disconnect( layer, &QgsMapLayer::request3DUpdate, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
 
  if ( layer->type() == Qgis::LayerType::Vector )
  {
    QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
    disconnect( vlayer, &QgsVectorLayer::selectionChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
    disconnect( vlayer, &QgsVectorLayer::layerModified, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
    mModelVectorLayers.removeAll( layer );
  }
 
  if ( layer->type() == Qgis::LayerType::Mesh )
  {
    disconnect( layer, &QgsMapLayer::rendererChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
  }
 
  if ( layer->type() == Qgis::LayerType::PointCloud )
  {
    QgsPointCloudLayer *pclayer = qobject_cast<QgsPointCloudLayer *>( layer );
    disconnect( pclayer, &QgsPointCloudLayer::renderer3DChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
    disconnect( pclayer, &QgsPointCloudLayer::subsetStringChanged, this, &Qgs3DMapScene::onLayerRenderer3DChanged );
  }
}
 
void Qgs3DMapScene::finalizeNewEntity( Qt3DCore::QEntity *newEntity )
{
  // set clip planes on the new entity if necessary
  handleClippingOnEntity( newEntity );
 
  // this is probably not the best place for material-specific configuration,
  // maybe this could be more generalized when other materials need some specific treatment
  const QList< QgsLineMaterial *> childLineMaterials = newEntity->findChildren<QgsLineMaterial *>();
  for ( QgsLineMaterial *lm : childLineMaterials )
  {
    connect( mEngine, &QgsAbstract3DEngine::sizeChanged, lm, [lm, this]
    {
      lm->setViewportSize( mEngine->size() );
    } );
 
    lm->setViewportSize( mEngine->size() );
  }
  // configure billboard's viewport when the viewport is changed.
  const QList< QgsPoint3DBillboardMaterial *> childBillboardMaterials = newEntity->findChildren<QgsPoint3DBillboardMaterial *>();
  for ( QgsPoint3DBillboardMaterial *bm : childBillboardMaterials )
  {
    connect( mEngine, &QgsAbstract3DEngine::sizeChanged, bm, [bm, this]
    {
      bm->setViewportSize( mEngine->size() );
    } );
 
    bm->setViewportSize( mEngine->size() );
  }
 
  // Finalize adding the 3D transparent objects by adding the layer components to the entities
  QgsFrameGraph *frameGraph = mEngine->frameGraph();
  Qt3DRender::QLayer *transparentLayer = frameGraph->transparentObjectLayer();
  const QList< Qt3DRender::QMaterial *> childMaterials = newEntity->findChildren<Qt3DRender::QMaterial *>();
  for ( Qt3DRender::QMaterial *material : childMaterials )
  {
    // This handles the phong material without data defined properties.
    if ( Qt3DExtras::QDiffuseSpecularMaterial *ph = qobject_cast<Qt3DExtras::QDiffuseSpecularMaterial *>( material ) )
    {
      if ( ph->diffuse().value<QColor>().alphaF() != 1.0f )
      {
        Qt3DCore::QEntity *entity = qobject_cast<Qt3DCore::QEntity *>( ph->parent() );
        if ( entity && !entity->components().contains( transparentLayer ) )
        {
          entity->addComponent( transparentLayer );
        }
      }
    }
    else
    {
      // This handles the phong material with data defined properties, the textured case and point (instanced) symbols.
      Qt3DRender::QEffect *effect = material->effect();
      if ( effect )
      {
        const QVector< Qt3DRender::QParameter *> parameters = effect->parameters();
        for ( const Qt3DRender::QParameter *parameter : parameters )
        {
          if ( parameter->name() == "opacity" && parameter->value() != 1.0f )
          {
            Qt3DCore::QEntity *entity = qobject_cast<Qt3DCore::QEntity *>( material->parent() );
            if ( entity && !entity->components().contains( transparentLayer ) )
            {
              entity->addComponent( transparentLayer );
            }
            break;
          }
        }
      }
    }
  }
}
 
int Qgs3DMapScene::maximumTextureSize() const
{
  QSurface *surface = mEngine->surface();
  QOpenGLContext context;
  context.create();
  bool success =  context.makeCurrent( surface );
 
  if ( success )
  {
    QOpenGLFunctions openglFunctions = QOpenGLFunctions( &context );
 
    GLint size;
    openglFunctions.initializeOpenGLFunctions();
    openglFunctions.glGetIntegerv( GL_MAX_TEXTURE_SIZE, &size );
    return int( size );
  }
  else
  {
    return 4096; //we can't have a context to defined the max texture size, we use this reasonable value
  }
 
}
 
void Qgs3DMapScene::addCameraViewCenterEntity( Qt3DRender::QCamera *camera )
{
  mEntityCameraViewCenter = new Qt3DCore::QEntity;
 
  Qt3DCore::QTransform *trCameraViewCenter = new Qt3DCore::QTransform;
  mEntityCameraViewCenter->addComponent( trCameraViewCenter );
  connect( camera, &Qt3DRender::QCamera::viewCenterChanged, this, [trCameraViewCenter, camera]
  {
    trCameraViewCenter->setTranslation( camera->viewCenter() );
  } );
 
  Qt3DExtras::QPhongMaterial *materialCameraViewCenter = new Qt3DExtras::QPhongMaterial;
  materialCameraViewCenter->setAmbient( Qt::red );
  mEntityCameraViewCenter->addComponent( materialCameraViewCenter );
 
  Qt3DExtras::QSphereMesh *rendererCameraViewCenter = new Qt3DExtras::QSphereMesh;
  rendererCameraViewCenter->setRadius( 10 );
  mEntityCameraViewCenter->addComponent( rendererCameraViewCenter );
 
  mEntityCameraViewCenter->setEnabled( mMap.showCameraViewCenter() );
  mEntityCameraViewCenter->setParent( this );
 
  connect( &mMap, &Qgs3DMapSettings::showCameraViewCenterChanged, this, [this]
  {
    mEntityCameraViewCenter->setEnabled( mMap.showCameraViewCenter() );
  } );
}
 
void Qgs3DMapScene::setSceneState( Qgs3DMapScene::SceneState state )
{
  if ( mSceneState == state )
    return;
  mSceneState = state;
  emit sceneStateChanged();
}
 
void Qgs3DMapScene::updateSceneState()
{
  if ( mTerrainUpdateScheduled )
  {
    setSceneState( Updating );
    return;
  }
 
  for ( Qgs3DMapSceneEntity *entity : std::as_const( mSceneEntities ) )
  {
    if ( entity->isEnabled() && entity->pendingJobsCount() > 0 )
    {
      setSceneState( Updating );
      return;
    }
  }
 
  setSceneState( Ready );
}
 
void Qgs3DMapScene::onSkyboxSettingsChanged()
{
  QgsSkyboxSettings skyboxSettings = mMap.skyboxSettings();
  if ( mSkybox )
  {
    mSkybox->deleteLater();
    mSkybox = nullptr;
  }
 
  mEngine->setFrustumCullingEnabled( !mMap.isSkyboxEnabled() );
 
  if ( mMap.isSkyboxEnabled() )
  {
    QMap<QString, QString> faces;
    switch ( skyboxSettings.skyboxType() )
    {
      case QgsSkyboxEntity::DistinctTexturesSkybox:
        faces = skyboxSettings.cubeMapFacesPaths();
        mSkybox = new QgsCubeFacesSkyboxEntity(
          faces[QStringLiteral( "posX" )], faces[QStringLiteral( "posY" )], faces[QStringLiteral( "posZ" )],
          faces[QStringLiteral( "negX" )], faces[QStringLiteral( "negY" )], faces[QStringLiteral( "negZ" )],
          this
        );
        break;
      case QgsSkyboxEntity::PanoramicSkybox:
        mSkybox = new QgsPanoramicSkyboxEntity( skyboxSettings.panoramicTexturePath(), this );
        break;
    }
  }
}
 
void Qgs3DMapScene::onShadowSettingsChanged()
{
  QgsFrameGraph *frameGraph = mEngine->frameGraph();
 
  const QList< QgsLightSource * > lightSources = mMap.lightSources();
  QList< QgsDirectionalLightSettings * > directionalLightSources;
  for ( QgsLightSource *source : lightSources )
  {
    if ( source->type() == Qgis::LightSourceType::Directional )
    {
      directionalLightSources << qgis::down_cast< QgsDirectionalLightSettings * >( source );
    }
  }
 
  QgsShadowSettings shadowSettings = mMap.shadowSettings();
  int selectedLight = shadowSettings.selectedDirectionalLight();
  if ( shadowSettings.renderShadows() && selectedLight >= 0 && selectedLight < directionalLightSources.count() )
  {
    frameGraph->setShadowRenderingEnabled( true );
    frameGraph->setShadowBias( shadowSettings.shadowBias() );
    frameGraph->setShadowMapResolution( shadowSettings.shadowMapResolution() );
    QgsDirectionalLightSettings light = *directionalLightSources.at( selectedLight );
    frameGraph->setupDirectionalLight( light, shadowSettings.maximumShadowRenderingDistance() );
  }
  else
    frameGraph->setShadowRenderingEnabled( false );
}
 
void Qgs3DMapScene::onAmbientOcclusionSettingsChanged()
{
  QgsFrameGraph *frameGraph = mEngine->frameGraph();
  QgsAmbientOcclusionSettings ambientOcclusionSettings = mMap.ambientOcclusionSettings();
  frameGraph->setAmbientOcclusionEnabled( ambientOcclusionSettings.isEnabled() );
  frameGraph->setAmbientOcclusionRadius( ambientOcclusionSettings.radius() );
  frameGraph->setAmbientOcclusionIntensity( ambientOcclusionSettings.intensity() );
  frameGraph->setAmbientOcclusionThreshold( ambientOcclusionSettings.threshold() );
}
 
void Qgs3DMapScene::onDebugShadowMapSettingsChanged()
{
  mEngine->frameGraph()->setupShadowMapDebugging( mMap.debugShadowMapEnabled(), mMap.debugShadowMapCorner(), mMap.debugShadowMapSize() );
}
 
void Qgs3DMapScene::onDebugDepthMapSettingsChanged()
{
  mEngine->frameGraph()->setupDepthMapDebugging( mMap.debugDepthMapEnabled(), mMap.debugDepthMapCorner(), mMap.debugDepthMapSize() );
}
 
void Qgs3DMapScene::onDebugOverlayEnabledChanged()
{
  mEngine->frameGraph()->setDebugOverlayEnabled( mMap.isDebugOverlayEnabled() );
  mEngine->renderSettings()->setRenderPolicy( mMap.isDebugOverlayEnabled() ? Qt3DRender::QRenderSettings::Always : Qt3DRender::QRenderSettings::OnDemand );
}
 
void Qgs3DMapScene::onEyeDomeShadingSettingsChanged()
{
  bool edlEnabled = mMap.eyeDomeLightingEnabled();
  double edlStrength = mMap.eyeDomeLightingStrength();
  double edlDistance = mMap.eyeDomeLightingDistance();
  mEngine->frameGraph()->setupEyeDomeLighting( edlEnabled, edlStrength, edlDistance );
}
 
void Qgs3DMapScene::onCameraMovementSpeedChanged()
{
  mCameraController->setCameraMovementSpeed( mMap.cameraMovementSpeed() );
}
 
void Qgs3DMapScene::onCameraNavigationModeChanged()
{
  mCameraController->setCameraNavigationMode( mMap.cameraNavigationMode() );
}
 
void Qgs3DMapScene::exportScene( const Qgs3DMapExportSettings &exportSettings )
{
  QVector<QString> notParsedLayers;
  Qgs3DSceneExporter exporter;
 
  exporter.setTerrainResolution( exportSettings.terrrainResolution() );
  exporter.setSmoothEdges( exportSettings.smoothEdges() );
  exporter.setExportNormals( exportSettings.exportNormals() );
  exporter.setExportTextures( exportSettings.exportTextures() );
  exporter.setTerrainTextureResolution( exportSettings.terrainTextureResolution() );
  exporter.setScale( exportSettings.scale() );
 
  for ( auto it = mLayerEntities.constBegin(); it != mLayerEntities.constEnd(); ++it )
  {
    QgsMapLayer *layer = it.key();
    Qt3DCore::QEntity *rootEntity = it.value();
    Qgis::LayerType layerType =  layer->type();
    switch ( layerType )
    {
      case Qgis::LayerType::Vector:
        if ( !exporter.parseVectorLayerEntity( rootEntity, qobject_cast<QgsVectorLayer *>( layer ) ) )
          notParsedLayers.push_back( layer->name() );
        break;
      case Qgis::LayerType::Raster:
      case Qgis::LayerType::Plugin:
      case Qgis::LayerType::Mesh:
      case Qgis::LayerType::VectorTile:
      case Qgis::LayerType::Annotation:
      case Qgis::LayerType::PointCloud:
      case Qgis::LayerType::Group:
      case Qgis::LayerType::TiledScene:
        notParsedLayers.push_back( layer->name() );
        break;
    }
  }
 
  if ( mTerrain )
    exporter.parseTerrain( mTerrain, "Terrain" );
 
  exporter.save( exportSettings.sceneName(), exportSettings.sceneFolderPath() );
 
  if ( !notParsedLayers.empty() )
  {
    QString message = tr( "The following layers were not exported:" ) + "\n";
    for ( const QString &layerName : notParsedLayers )
      message += layerName + "\n";
    QgsMessageOutput::showMessage( tr( "3D exporter warning" ), message, QgsMessageOutput::MessageText );
  }
}
 
QVector<const QgsChunkNode *> Qgs3DMapScene::getLayerActiveChunkNodes( QgsMapLayer *layer )
{
  QVector<const QgsChunkNode *> chunks;
  if ( !mLayerEntities.contains( layer ) ) return chunks;
  if ( QgsChunkedEntity *c = qobject_cast<QgsChunkedEntity *>( mLayerEntities[ layer ] ) )
  {
    const QList< QgsChunkNode * > activeNodes = c->activeNodes();
    for ( QgsChunkNode *n : activeNodes )
      chunks.push_back( n );
  }
  return chunks;
}
 
QgsRectangle Qgs3DMapScene::sceneExtent() const
{
  return mMap.extent();
}
 
QgsDoubleRange Qgs3DMapScene::elevationRange() const
{
  double yMin = std::numeric_limits< double >::max();
  double yMax = std::numeric_limits< double >::lowest();
  if ( mMap.terrainRenderingEnabled() && mTerrain )
  {
    const QgsAABB bbox = mTerrain->rootNode()->bbox();
    yMin = std::min( yMin, static_cast< double >( bbox.yMin ) );
    yMax = std::max( yMax, static_cast< double >( bbox.yMax ) );
  }
 
  for ( auto it = mLayerEntities.constBegin(); it != mLayerEntities.constEnd(); it++ )
  {
    QgsMapLayer *layer = it.key();
    switch ( layer->type() )
    {
      case Qgis::LayerType::PointCloud:
      {
        QgsPointCloudLayer *pcl = qobject_cast< QgsPointCloudLayer *>( layer );
        QgsDoubleRange zRange = pcl->elevationProperties()->calculateZRange( pcl );
        yMin = std::min( yMin, zRange.lower() );
        yMax = std::max( yMax, zRange.upper() );
        break;
      }
      case Qgis::LayerType::Mesh:
      {
        QgsMeshLayer *meshLayer = qobject_cast< QgsMeshLayer *>( layer );
        QgsAbstract3DRenderer *renderer3D = meshLayer->renderer3D();
        if ( renderer3D )
        {
          QgsMeshLayer3DRenderer *meshLayerRenderer = static_cast<QgsMeshLayer3DRenderer *>( renderer3D );
          const int verticalGroupDatasetIndex = meshLayerRenderer->symbol()->verticalDatasetGroupIndex();
          const QgsMeshDatasetGroupMetadata verticalGroupMetadata = meshLayer->datasetGroupMetadata( verticalGroupDatasetIndex );
          const double verticalScale = meshLayerRenderer->symbol()->verticalScale();
          yMin = std::min( yMin, verticalGroupMetadata.minimum() * verticalScale );
          yMax = std::max( yMax, verticalGroupMetadata.maximum() * verticalScale );
        }
        break;
      }
      case Qgis::LayerType::TiledScene:
      {
        QgsTiledSceneLayer *sceneLayer = qobject_cast< QgsTiledSceneLayer *>( layer );
        const QgsDoubleRange zRange = sceneLayer->elevationProperties()->calculateZRange( sceneLayer );
        if ( !zRange.isInfinite() && !zRange.isEmpty() )
        {
          yMin = std::min( yMin, zRange.lower() );
          yMax = std::max( yMax, zRange.upper() );
        }
        break;
      }
      case Qgis::LayerType::Annotation:
      case Qgis::LayerType::Group:
      case Qgis::LayerType::Plugin:
      case Qgis::LayerType::Raster:
      case Qgis::LayerType::Vector:
      case Qgis::LayerType::VectorTile:
        break;
    }
  }
  const QgsDoubleRange yRange( std::min( yMin, std::numeric_limits<double>::max() ),
                               std::max( yMax, std::numeric_limits<double>::lowest() ) );
  return yRange.isEmpty() ? QgsDoubleRange() : yRange;
}
 
QMap< QString, Qgs3DMapScene * > Qgs3DMapScene::openScenes()
{
  return sOpenScenesFunction();
}
 
void Qgs3DMapScene::addCameraRotationCenterEntity( QgsCameraController *controller )
{
  mEntityRotationCenter = new Qt3DCore::QEntity;
 
  Qt3DCore::QTransform *trRotationCenter = new Qt3DCore::QTransform;
  mEntityRotationCenter->addComponent( trRotationCenter );
  Qt3DExtras::QPhongMaterial *materialRotationCenter = new Qt3DExtras::QPhongMaterial;
  materialRotationCenter->setAmbient( Qt::blue );
  mEntityRotationCenter->addComponent( materialRotationCenter );
  Qt3DExtras::QSphereMesh *rendererRotationCenter = new Qt3DExtras::QSphereMesh;
  rendererRotationCenter->setRadius( 10 );
  mEntityRotationCenter->addComponent( rendererRotationCenter );
  mEntityRotationCenter->setEnabled( false );
  mEntityRotationCenter->setParent( this );
 
  connect( controller, &QgsCameraController::cameraRotationCenterChanged, this, [trRotationCenter]( QVector3D center )
  {
    trRotationCenter->setTranslation( center );
  } );
 
  connect( &mMap, &Qgs3DMapSettings::showCameraRotationCenterChanged, this, [this]
  {
    mEntityRotationCenter->setEnabled( mMap.showCameraRotationCenter() );
  } );
}
 
void Qgs3DMapScene::on3DAxisSettingsChanged()
{
  if ( m3DAxis )
  {
    m3DAxis->onAxisSettingsChanged();
  }
  else
  {
    if ( QgsWindow3DEngine *engine = dynamic_cast<QgsWindow3DEngine *>( mEngine ) )
    {
      m3DAxis = new Qgs3DAxis( static_cast<Qgs3DMapCanvas *>( engine->window() ),
                               engine->root(),
                               this,
                               mCameraController,
                               &mMap );
    }
  }
}
 
void Qgs3DMapScene::handleClippingOnEntity( QEntity *entity ) const
{
  if ( mClipPlanesEquations.isEmpty() ) // no clip plane equations, disable clipping
  {
    for ( QgsMaterial *material : entity->componentsOfType<QgsMaterial>() )
    {
      material->disableClipping();
    }
  }
  else // enable clipping
  {
    for ( QgsMaterial *material : entity->componentsOfType<QgsMaterial>() )
    {
      material->enableClipping( mClipPlanesEquations );
    }
  }
 
  // recursive call
  // enable or disable clipping on the children accordingly
  for ( QObject *child : entity->children() )
  {
    Qt3DCore::QEntity *childEntity = qobject_cast<Qt3DCore::QEntity *>( child );
    if ( childEntity )
    {
      handleClippingOnEntity( childEntity );
    }
  }
}
 
void Qgs3DMapScene::handleClippingOnAllEntities() const
{
  // Need to loop mLayerEntities instead of mSceneEntities to handle entities
  // which do no inherit from Qgs3DMapSceneEntity. For example, mesh entities.
  for ( auto it = mLayerEntities.constBegin(); it != mLayerEntities.constEnd(); ++it )
  {
    handleClippingOnEntity( it.value() );
  }
  if ( mTerrain )
  {
    handleClippingOnEntity( mTerrain );
  }
}
 
void Qgs3DMapScene::enableClipping( const QList<QVector4D> &clipPlaneEquations )
{
  if ( clipPlaneEquations.size() > 8 )
  {
    QgsDebugMsgLevel( QStringLiteral( "Qgs3DMapScene::enableClipping: it is not possible to use more than 8 clipping planes." ), 2 );
  }
  mClipPlanesEquations = clipPlaneEquations.mid( 0, 8 );
 
  // enable the clip planes on the framegraph
  QgsFrameGraph *frameGraph = mEngine->frameGraph();
  frameGraph->addClipPlanes( clipPlaneEquations.size() );
 
  // Enable the clip planes for the material of each entity.
  handleClippingOnAllEntities();
}
 
void Qgs3DMapScene::disableClipping()
{
  mClipPlanesEquations.clear();
 
  // disable the clip planes on the framegraph
  QgsFrameGraph *frameGraph = mEngine->frameGraph();
  frameGraph->removeClipPlanes();
 
  // Disable the clip planes for the material of each entity.
  handleClippingOnAllEntities();
}