- Qt 6.6
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Volumetric Rendering Example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Volumetric Rendering Example

     // Copyright (C) 2023 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

     #ifndef VOLUMETEXTUREDATA_H
     #define VOLUMETEXTUREDATA_H

     #include "qthread.h"
     #include <QMutex>
     #include <QtQuick3D/QQuick3DTextureData>
     #include <QtQml/QQmlEngine>

     #include <QtGui/QColor>
     #include <QtCore/QByteArray>
     #include <QUrl>
     #include <QVector3D>

     class VolumeTextureData : public QQuick3DTextureData
     {
         Q_OBJECT
         QML_ELEMENT

     public:
         struct AsyncLoaderData
         {
             QUrl source;
             qsizetype width = 0;
             qsizetype height = 0;
             qsizetype depth = 0;
             QString dataType;
             QByteArray volumeData = {};
             bool success = false;
         };

         VolumeTextureData();
         ~VolumeTextureData();

         Q_PROPERTY(QUrl source READ source WRITE setSource NOTIFY sourceChanged)
         Q_PROPERTY(qsizetype width READ width WRITE setWidth NOTIFY widthChanged FINAL)
         Q_PROPERTY(qsizetype height READ height WRITE setHeight NOTIFY heightChanged FINAL)
         Q_PROPERTY(qsizetype depth READ depth WRITE setDepth NOTIFY depthChanged FINAL)
         Q_PROPERTY(QString dataType READ dataType WRITE setDataType NOTIFY dataTypeChanged FINAL)

         QUrl source() const;
         void setSource(const QUrl &newSource);

         qsizetype width() const;
         void setWidth(qsizetype newWidth);

         qsizetype height() const;
         void setHeight(qsizetype newHeight);

         qsizetype depth() const;
         void setDepth(qsizetype newDepth);

         QString dataType() const;
         void setDataType(const QString &newDataType);

         Q_INVOKABLE void loadAsync(QUrl source, qsizetype width, qsizetype height, qsizetype depth, QString dataType);

     signals:
         void sourceChanged();
         void widthChanged();
         void heightChanged();
         void depthChanged();
         void dataTypeChanged();
         void loadSucceeded(QUrl source, qsizetype width, qsizetype height, qsizetype depth, QString dataType);
         void loadFailed(QUrl source, qsizetype width, qsizetype height, qsizetype depth, QString dataType);

     public slots:
         void handleResults(VolumeTextureData::AsyncLoaderData result);

     private:
     signals:
         void startWorker(VolumeTextureData::AsyncLoaderData data);

     private:
         void updateTextureDimensions();
         void initWorker();

         QUrl m_source;
         qsizetype m_width = 0;
         qsizetype m_height = 0;
         qsizetype m_depth = 0;
         qsizetype m_currentDataSize = 0;
         QString m_dataType;

         // Async variables
         AsyncLoaderData loaderData;
         bool m_isLoading = false;
         bool m_isAborting = false;
         QThread workerThread;
     };

     #endif // VOLUMETEXTUREDATA_H