Qgs3DMapScene::Qgs3DMapScene( const Qgs3DMapSettings &map, QgsAbstract3DEngine *engine )
: mMap( map )
, mEngine( engine )
{
connect( &map, &Qgs3DMapSettings::backgroundColorChanged, this, &Qgs3DMapScene::onBackgroundColorChanged );
onBackgroundColorChanged();
// TODO: strange - setting OnDemand render policy still keeps QGIS busy (Qt 5.9.0)
// actually it is more busy than with the default "Always" policy although there are no changes in the scene.
//mRenderer->renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::OnDemand );
#if QT_VERSION >= 0x050900
// we want precise picking of terrain (also bounding volume picking does not seem to work - not sure why)
mEngine->renderSettings()->pickingSettings()->setPickMethod( Qt3DRender::QPickingSettings::TrianglePicking );
#endif
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->setViewport( viewportRect );
mCameraController->setCamera( mEngine->camera() );
mCameraController->resetView( 1000 );
addCameraViewCenterEntity( mEngine->camera() );
// create terrain entity
createTerrainDeferred();
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::pointLightsChanged, this, &Qgs3DMapScene::updateLights );
connect( &map, &Qgs3DMapSettings::fieldOfViewChanged, this, &Qgs3DMapScene::updateCameraLens );
// create entities of renderers
Q_FOREACH ( const QgsAbstract3DRenderer *renderer, map.renderers() )
{
Qt3DCore::QEntity *newEntity = renderer->createEntity( map );
newEntity->setParent( this );
}
// listen to changes of layers in order to add/remove 3D renderer entities
connect( &map, &Qgs3DMapSettings::layersChanged, this, &Qgs3DMapScene::onLayersChanged );
updateLights();
#if 0
ChunkedEntity *testChunkEntity = new ChunkedEntity( AABB( -500, 0, -500, 500, 100, 500 ), 2.f, 3.f, 7, new TestChunkLoaderFactory );
testChunkEntity->setEnabled( false );
testChunkEntity->setParent( this );
chunkEntities << testChunkEntity;
#endif
connect( mCameraController, &QgsCameraController::cameraChanged, this, &Qgs3DMapScene::onCameraChanged );
connect( mCameraController, &QgsCameraController::viewportChanged, this, &Qgs3DMapScene::onCameraChanged );
#if 0
// experiments with loading of existing 3D models.
// scene loader only gets loaded only when added to a scene...
// it loads everything: geometries, materials, transforms, lights, cameras (if any)
Qt3DCore::QEntity *loaderEntity = new Qt3DCore::QEntity;
Qt3DRender::QSceneLoader *loader = new Qt3DRender::QSceneLoader;
loader->setSource( QUrl( "file:///home/martin/Downloads/LowPolyModels/tree.dae" ) );
loaderEntity->addComponent( loader );
loaderEntity->setParent( this );
// mesh loads just geometry as one geometry...
// so if there are different materials (e.g. colors) used in the model, this information is lost
Qt3DCore::QEntity *meshEntity = new Qt3DCore::QEntity;
Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh;
mesh->setSource( QUrl( "file:///home/martin/Downloads/LowPolyModels/tree.obj" ) );
meshEntity->addComponent( mesh );
Qt3DExtras::QPhongMaterial *material = new Qt3DExtras::QPhongMaterial;
material->setAmbient( Qt::red );
meshEntity->addComponent( material );
Qt3DCore::QTransform *meshTransform = new Qt3DCore::QTransform;
meshTransform->setScale( 1 );
meshEntity->addComponent( meshTransform );
meshEntity->setParent( this );
#endif
if ( map.hasSkyboxEnabled() )
{
Qt3DExtras::QSkyboxEntity *skybox = new Qt3DExtras::QSkyboxEntity;
skybox->setBaseName( map.skyboxFileBase() );
skybox->setExtension( map.skyboxFileExtension() );
skybox->setParent( this );
// docs say frustum culling must be disabled for skybox.
// it _somehow_ works even when frustum culling is enabled with some camera positions,
// but then when zoomed in more it would disappear - so let's keep frustum culling disabled
mEngine->setFrustumCullingEnabled( false );
}
// force initial update of chunked entities
onCameraChanged();
}
void QgsBufferedLine3DSymbolHandler::makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, LineData &out, bool selected )
{
if ( out.polygons.isEmpty() )
return; // nothing to show - no need to create the entity
Qt3DExtras::QPhongMaterial *mat = _material( mSymbol );
if ( selected )
{
// update the material with selection colors
mat->setDiffuse( context.map().selectionColor() );
mat->setAmbient( context.map().selectionColor().darker() );
}
QgsPointXY origin( context.map().origin().x(), context.map().origin().y() );
QgsTessellatedPolygonGeometry *geometry = new QgsTessellatedPolygonGeometry;
geometry->setPolygons( out.polygons, out.fids, origin, mSymbol.extrusionHeight() );
Qt3DRender::QGeometryRenderer *renderer = new Qt3DRender::QGeometryRenderer;
renderer->setGeometry( geometry );
// make entity
Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
entity->addComponent( renderer );
entity->addComponent( mat );
entity->setParent( parent );
if ( !selected )
entity->findChild<Qt3DRender::QGeometryRenderer *>()->setObjectName( QStringLiteral( "main" ) ); // temporary measure to distinguish between "selected" and "main"
}
virtual Qt3DCore::QEntity *createEntity( Qt3DCore::QEntity *parent )
{
Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
// create geometry renderer
Qt3DRender::QGeometryRenderer *mesh = new Qt3DRender::QGeometryRenderer;
mesh->setGeometry( new QuantizedMeshGeometry( qmt, mTerrain->map3D(), mapSettings.mapToPixel(), mTerrain->terrainToMapTransform(), mesh ) );
entity->addComponent( mesh );
// create material
createTextureComponent( entity );
// create transform
Qt3DCore::QTransform *transform;
transform = new Qt3DCore::QTransform();
entity->addComponent( transform );
const Map3D &map = mTerrain->map3D();
transform->setScale3D( QVector3D( 1.f, map.zExaggeration, 1.f ) );
QgsRectangle mapExtent = mapSettings.extent();
float x0 = mapExtent.xMinimum() - map.originX;
float y0 = mapExtent.yMinimum() - map.originY;
float x1 = mapExtent.xMaximum() - map.originX;
float y1 = mapExtent.yMaximum() - map.originY;
float z0 = qmt->header.MinimumHeight, z1 = qmt->header.MaximumHeight;
node->setExactBbox( AABB( x0, z0 * map.zExaggeration, -y0, x1, z1 * map.zExaggeration, -y1 ) );
//epsilon = mapExtent.width() / map.tileTextureSize;
entity->setEnabled( false );
entity->setParent( parent );
return entity;
}
void QgsSimpleLine3DSymbolHandler::makeEntity( Qt3DCore::QEntity *parent, const Qgs3DRenderContext &context, LineData &out, bool selected )
{
if ( out.indexes.isEmpty() )
return;
// material (only ambient color is used for the color)
Qt3DExtras::QPhongMaterial *mat = _material( mSymbol );
if ( selected )
{
// update the material with selection colors
mat->setAmbient( context.map().selectionColor() );
}
// geometry renderer
QByteArray vertexBufferData;
vertexBufferData.resize( out.vertices.size() * 3 * sizeof( float ) );
float *rawVertexArray = reinterpret_cast<float *>( vertexBufferData.data() );
int idx = 0;
for ( const auto &v : qgis::as_const( out.vertices ) )
{
rawVertexArray[idx++] = v.x();
rawVertexArray[idx++] = v.y();
rawVertexArray[idx++] = v.z();
}
QByteArray indexBufferData;
indexBufferData.resize( out.indexes.size() * sizeof( int ) );
unsigned int *rawIndexArray = reinterpret_cast<unsigned int *>( indexBufferData.data() );
idx = 0;
for ( unsigned int indexVal : qgis::as_const( out.indexes ) )
{
rawIndexArray[idx++] = indexVal;
}
Qt3DCore::QEntity *entity = new Qt3DCore::QEntity;
Qt3DRender::QBuffer *vertexBuffer = new Qt3DRender::QBuffer( Qt3DRender::QBuffer::VertexBuffer, entity );
vertexBuffer->setData( vertexBufferData );
Qt3DRender::QBuffer *indexBuffer = new Qt3DRender::QBuffer( Qt3DRender::QBuffer::IndexBuffer, entity );
indexBuffer->setData( indexBufferData );
Qt3DRender::QAttribute *positionAttribute = new Qt3DRender::QAttribute( entity );
positionAttribute->setAttributeType( Qt3DRender::QAttribute::VertexAttribute );
positionAttribute->setBuffer( vertexBuffer );
positionAttribute->setVertexBaseType( Qt3DRender::QAttribute::Float );
positionAttribute->setVertexSize( 3 );
positionAttribute->setName( Qt3DRender::QAttribute::defaultPositionAttributeName() );
Qt3DRender::QAttribute *indexAttribute = new Qt3DRender::QAttribute( entity );
indexAttribute->setAttributeType( Qt3DRender::QAttribute::IndexAttribute );
indexAttribute->setBuffer( indexBuffer );
indexAttribute->setVertexBaseType( Qt3DRender::QAttribute::UnsignedInt );
Qt3DRender::QGeometry *geom = new Qt3DRender::QGeometry;
geom->addAttribute( positionAttribute );
geom->addAttribute( indexAttribute );
Qt3DRender::QGeometryRenderer *renderer = new Qt3DRender::QGeometryRenderer;
renderer->setPrimitiveType( Qt3DRender::QGeometryRenderer::LineStrip );
renderer->setGeometry( geom );
renderer->setVertexCount( out.vertices.count() );
renderer->setPrimitiveRestartEnabled( true );
renderer->setRestartIndexValue( 0 );
// make entity
entity->addComponent( renderer );
entity->addComponent( mat );
entity->setParent( parent );
}
