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Showing content from https://developers.arcgis.com/qt/cpp/sample-code/scene-symbols/ below:

Scene symbols | ArcGIS Maps SDK for Qt

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Show various kinds of 3D symbols in a scene.

You can programmatically create different types of 3D symbols and add them to a scene at specified locations. You could do this to call attention to the prominence of a location.

When the scene loads, note the different types of 3D symbols that you can create.

1. Create a GraphicsOverlay.
2. Create various simple marker scene symbols by specifying different styles and colors, and a height, width, depth, and anchor position of each.
3. Create a Graphic for each symbol.
4. Add the graphics to the graphics overlay.
5. Add the graphics overlay to the SceneView.

• SceneSymbol::anchorPosition
• SimpleMarkerSceneSymbol
• SimpleMarkerSceneSymbol::style

This sample shows arbitrary symbols in an empty scene with imagery basemap.

3D, cone, cube, cylinder, diamond, geometry, graphic, graphics overlay, pyramid, scene, shape, sphere, symbol, tetrahedron, tube, visualization

Symbols.cpp Symbols.cpp Symbols.h Symbols.qml

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// [WriteFile Name=Symbols, Category=Scenes]
// [Legal]
// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

// sample headers
#include "Symbols.h"

// ArcGIS Maps SDK headers
#include "ArcGISTiledElevationSource.h"
#include "Basemap.h"
#include "Camera.h"
#include "ElevationSourceListModel.h"
#include "Graphic.h"
#include "GraphicListModel.h"
#include "GraphicsOverlay.h"
#include "GraphicsOverlayListModel.h"
#include "LayerSceneProperties.h"
#include "MapTypes.h"
#include "Point.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "SceneViewTypes.h"
#include "SimpleMarkerSceneSymbol.h"
#include "SpatialReference.h"
#include "Surface.h"
#include "SymbolTypes.h"

using namespace Esri::ArcGISRuntime;

Symbols::Symbols(QQuickItem* parent) :
  QQuickItem(parent)
{
}

Symbols::~Symbols() = default;

void Symbols::init()
{
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<Symbols>("Esri.Samples", 1, 0, "SymbolsSample");
}

void Symbols::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML SceneView component
  m_sceneView = findChild<SceneQuickView*>("sceneView");

  // create a new basemap instance
  Basemap* basemap = new Basemap(BasemapStyle::ArcGISImageryStandard, this);
  // create a new scene instance
  m_scene = new Scene(basemap, this);
  // set scene on the scene view
  m_sceneView->setArcGISScene(m_scene);

  // create a new elevation source
  ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"), this);
  // add the elevation source to the scene to display elevation
  m_scene->baseSurface()->elevationSources()->append(elevationSource);

  // create a camera
  Camera camera(34, 45, 6000, 0, 0, 0);
  // set the viewpoint
  m_sceneView->setViewpointCameraAndWait(camera);

  // create a graphics overlay
  GraphicsOverlay* graphicsOverlay = new GraphicsOverlay(this);
  graphicsOverlay->setSceneProperties(LayerSceneProperties(SurfacePlacement::Absolute));
  // add the graphics overlay to the scene view
  m_sceneView->graphicsOverlays()->append(graphicsOverlay);

  // create a map of the symbol styles and color
  QMap<SimpleMarkerSceneSymbolStyle, QColor> symbolStyles;
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Cone, QColor("red"));
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Cube, QColor("white"));
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Cylinder, QColor("purple"));
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Diamond, QColor("turquoise"));
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Sphere, QColor("blue"));
  symbolStyles.insert(SimpleMarkerSceneSymbolStyle::Tetrahedron, QColor("yellow"));
  QMapIterator<SimpleMarkerSceneSymbolStyle, QColor> i(symbolStyles);

  constexpr double x = 44.975;
  constexpr double y = 34.0;
  constexpr double z = 500.0;
  int counter = 0;

  // iterate over the map
  while (i.hasNext())
  {
    i.next();
    // create a scene symbol based on the current type
    SimpleMarkerSceneSymbol* smss = new SimpleMarkerSceneSymbol(i.key(), i.value(), 200, 200, 200, SceneSymbolAnchorPosition::Center, this);
    // create a graphic using the symbol above and a point location
    Graphic* graphic = new Graphic(Point(x + 0.01 * counter++, y, z, m_sceneView->spatialReference()), smss, this);
    // add the graphic to the graphics overlay
    graphicsOverlay->graphics()->append(graphic);
  }
}

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