Qt Quick 3D - Simple Skinning Example

 // Copyright (C) 2020 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #ifndef SKINGEOMETRY_H
 #define SKINGEOMETRY_H

 #include <QtQuick3D/qquick3d.h>
 #include <QtQuick3D/qquick3dgeometry.h>

 #include <QVector3D>
 #include <QtCore/QList>

 class SkinGeometry : public QQuick3DGeometry
 {
     Q_OBJECT
     QML_NAMED_ELEMENT(SkinGeometry)
     Q_PROPERTY(QList<QVector3D> positions READ positions WRITE setPositions NOTIFY positionsChanged)
     Q_PROPERTY(QList<qint32> joints READ joints WRITE setJoints NOTIFY jointsChanged)
     Q_PROPERTY(QList<float> weights READ weights WRITE setWeights NOTIFY weightsChanged)
     Q_PROPERTY(QList<quint32> indexes READ indexes WRITE setIndexes NOTIFY indexesChanged)

 public:
     SkinGeometry(QQuick3DObject *parent = nullptr);

     QList<QVector3D> positions() const;
     QList<qint32> joints() const;
     QList<float> weights() const;
     QList<quint32> indexes() const;

 public Q_SLOTS:
     void setPositions(const QList<QVector3D> &positions);
     void setJoints(const QList<qint32> &joints);
     void setWeights(const QList<float> &weights);
     void setIndexes(const QList<quint32> &indexes);

 Q_SIGNALS:
     void positionsChanged();
     void jointsChanged();
     void weightsChanged();
     void indexesChanged();

 protected:
     QSSGRenderGraphObject *updateSpatialNode(QSSGRenderGraphObject *node) override;

 private:
     QList<QVector3D> m_positions;
     QList<qint32> m_joints;
     QList<float> m_weights;
     QList<quint32> m_indexes;

     bool m_vertexDirty = false;
     bool m_indexDirty = false;

     QByteArray m_vertexBuffer;
     QByteArray m_indexBuffer;
 };

 #endif // SKINGEOMETRY_H