Qt3DRender::QGeometryRenderer *QgsLine3DSymbolEntityNode::rendererSimple( const Qgs3DMapSettings &map, const QgsLine3DSymbol &symbol, const QgsVectorLayer *layer, const QgsFeatureRequest &request )
{
QVector<QVector3D> vertices;
vertices << QVector3D(); // the first index is invalid, we use it for primitive restart
QVector<unsigned int> indexes;
QgsPoint centroid;
QgsPointXY origin( map.origin().x(), map.origin().y() );
QgsFeature f;
QgsFeatureIterator fi = layer->getFeatures( request );
while ( fi.nextFeature( f ) )
{
if ( f.geometry().isNull() )
continue;
if ( symbol.altitudeBinding() == AltBindCentroid )
centroid = QgsPoint( f.geometry().centroid().asPoint() );
QgsGeometry geom = f.geometry();
const QgsAbstractGeometry *g = geom.constGet();
if ( const QgsLineString *ls = qgsgeometry_cast<const QgsLineString *>( g ) )
{
for ( int i = 0; i < ls->vertexCount(); ++i )
{
QgsPoint p = ls->pointN( i );
float z = Qgs3DUtils::clampAltitude( p, symbol.altitudeClamping(), symbol.altitudeBinding(), symbol.height(), centroid, map );
vertices << QVector3D( p.x() - map.origin().x(), z, -( p.y() - map.origin().y() ) );
indexes << vertices.count() - 1;
}
}
else if ( const QgsMultiLineString *mls = qgsgeometry_cast<const QgsMultiLineString *>( g ) )
{
for ( int nGeom = 0; nGeom < mls->numGeometries(); ++nGeom )
{
const QgsLineString *ls = qgsgeometry_cast<const QgsLineString *>( mls->geometryN( nGeom ) );
for ( int i = 0; i < ls->vertexCount(); ++i )
{
QgsPoint p = ls->pointN( i );
float z = Qgs3DUtils::clampAltitude( p, symbol.altitudeClamping(), symbol.altitudeBinding(), symbol.height(), centroid, map );
vertices << QVector3D( p.x() - map.origin().x(), z, -( p.y() - map.origin().y() ) );
indexes << vertices.count() - 1;
}
indexes << 0; // add primitive restart
}
}
indexes << 0; // add primitive restart
}
QByteArray vertexBufferData;
vertexBufferData.resize( vertices.size() * 3 * sizeof( float ) );
float *rawVertexArray = reinterpret_cast<float *>( vertexBufferData.data() );
int idx = 0;
for ( const auto &v : vertices )
{
rawVertexArray[idx++] = v.x();
rawVertexArray[idx++] = v.y();
rawVertexArray[idx++] = v.z();
}
QByteArray indexBufferData;
indexBufferData.resize( indexes.size() * sizeof( int ) );
unsigned int *rawIndexArray = reinterpret_cast<unsigned int *>( indexBufferData.data() );
idx = 0;
for ( unsigned int indexVal : indexes )
{
rawIndexArray[idx++] = indexVal;
}
Qt3DRender::QBuffer *vertexBuffer = new Qt3DRender::QBuffer( Qt3DRender::QBuffer::VertexBuffer, this );
vertexBuffer->setData( vertexBufferData );
Qt3DRender::QBuffer *indexBuffer = new Qt3DRender::QBuffer( Qt3DRender::QBuffer::IndexBuffer, this );
indexBuffer->setData( indexBufferData );
Qt3DRender::QAttribute *positionAttribute = new Qt3DRender::QAttribute( this );
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( this );
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( vertices.count() );
renderer->setPrimitiveRestartEnabled( true );
renderer->setRestartIndexValue( 0 );
return renderer;
}
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 );
}
