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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;