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Showing content from https://developers.arcgis.com/qt/cpp/sample-code/view-content-beneath-terrain-surface/ below:

View content beneath terrain surface | ArcGIS Maps SDK for Qt

View on GitHub Sample viewer app

See through terrain in a scene and move the camera underground.

By default, a scene's terrain is fully opaque and the camera cannot go underground. To see underground features such as pipes in a utility network, you can lower the opacity of the terrain surface and set the navigation constraint on the surface to allow underground navigation.

The sample loads a scene with underground features. Pan and zoom to explore the scene. Observe how the opacity of the base surface is reduced and the navigation constraint is removed, allowing you to pan and zoom through the base surface.

1. Display a Scene in a SceneView which contains layers with underground features.
2. To see underground, get the scene's base surface and set its opacity to a value between 0 and 1.
3. To allow the camera to go underground, set the surface's navigation constraint to NONE.

• Surface
• NavigationConstraint

This data is a point scene layer showing underground wellbore paths (green polylines) and seismic events (brown points).

3D, subsurface, underground, utilities

ViewContentBeneathTerrainSurface.cpp ViewContentBeneathTerrainSurface.cpp ViewContentBeneathTerrainSurface.h ViewContentBeneathTerrainSurface.qml

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// [WriteFile Name=ViewContentBeneathTerrainSurface, Category=Scenes]
// [Legal]
// Copyright 2019 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 "ViewContentBeneathTerrainSurface.h"

// ArcGIS Maps SDK headers
#include "Error.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "SceneViewTypes.h"
#include "Surface.h"

using namespace Esri::ArcGISRuntime;

ViewContentBeneathTerrainSurface::ViewContentBeneathTerrainSurface(QObject* parent /* = nullptr */):
  QObject(parent)
{
  const auto url = QUrl("https://www.arcgis.com/home/item.html?id=91a4fafd747a47c7bab7797066cb9272");
  m_scene = new Scene(url, this);

  connect(m_scene, &Scene::doneLoading, this, [this](const Error& loadError)
  {
    if (!loadError.isEmpty())
      return;

    m_scene->baseSurface()->setOpacity(0.4f);
    m_scene->baseSurface()->setNavigationConstraint(NavigationConstraint::None);
  });
}

ViewContentBeneathTerrainSurface::~ViewContentBeneathTerrainSurface() = default;

void ViewContentBeneathTerrainSurface::init()
{
  // Register classes for QML
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<ViewContentBeneathTerrainSurface>("Esri.Samples", 1, 0, "ViewContentBeneathTerrainSurfaceSample");
}

SceneQuickView* ViewContentBeneathTerrainSurface::sceneView() const
{
  return m_sceneView;
}

// Set the view (created in QML)
void ViewContentBeneathTerrainSurface::setSceneView(SceneQuickView* sceneView)
{
  if (!sceneView || sceneView == m_sceneView)
    return;

  m_sceneView = sceneView;
  m_sceneView->setArcGISScene(m_scene);

  emit sceneViewChanged();
}

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