[Interest] QQuick3DGeometry example not working

[joao morgado]

I'm trying to draw a line using QQuick3DGeometry but nothing is draw. 
I couldnt find a working example of QQuick3DGeometry, if anyone knows please share.

Also I dont need normals for a line, but not using them gives me a warning: QSSG.warning: Failed to bind attribute attr_norm

The full code example I did:
https://drive.google.com/file/d/1trroeJ_xXjwbW8M1CKiy3WXAVtOl8UHQ/view?usp=sharing
The relevant code:
//--------------------------------------------------------------------
class Entity_Line : public QQuick3DGeometry
{
    Q_OBJECT
    Q_PROPERTY(QVector3D p0 READ p0 WRITE setP0 NOTIFY p0Changed)
    Q_PROPERTY(QVector3D p1 READ p1 WRITE setP1 NOTIFY p1Changed)

public:
    Entity_Line(QQuick3DObject *ptr = nullptr);

    //~Entity_Line();


    QVector3D p0() const {return m_P0;}
    QVector3D p1() const {return m_P1;}

public slots:
    void setP0(const QVector3D &p0);
    void setP0(const float &px, const float &py, const float &pz);
    void setP1(const QVector3D &p1);
    void setP1(const float &px, const float &py, const float &pz);

Q_INVOKABLE void setupGeometry();

signals:
    void p0Changed(QVector3D newP0);
    void p1Changed(QVector3D newP1);

private:
    QVector3D m_P0;
    QVector3D m_P1;
};

//---------------------------------------------------------------------------
Entity_Line::Entity_Line(QQuick3DObject *ptr) :
    QQuick3DGeometry(ptr)
{
    setName("line");
    setP0(-50, -50, -10);
    setP1(50, 50, 10);

    setupGeometry();

}

void Entity_Line::setP0(const QVector3D &p0)
{
    if (m_P0 == p0)
        return;
    m_P0 = p0;
    emit p0Changed(p0);
}

void Entity_Line::setP0(const float &px, const float &py, const float &pz)
{
    QVector3D v(px, py, pz);
    setP0(v);
}

void Entity_Line::setP1(const QVector3D &p1)
{
    qDebug()<<"setP1(const QVector3D &p1)........................................."<<p1.x();
    if (m_P1 == p1)
        return;
    m_P1 = p1;
    emit p1Changed(p1);
}

void Entity_Line::setP1(const float &px, const float &py, const float &pz)
{
    QVector3D v(px, py, pz);
    setP1(v);
}


void Entity_Line::setupGeometry()
{

    QByteArray vertices;
    QByteArray indices;

    vertices.clear();
    vertices.resize(2*sizeof(QVector3D));
    vertices.append(m_P0.x());
    vertices.append(m_P0.y());
    vertices.append(m_P0.z());

    vertices.append(m_P1.x());
    vertices.append(m_P1.y());
    vertices.append(m_P1.z());

    uint i;
    indices.clear();
    i = 0;
    indices.append(i);
    i = 1;
    indices.append(i);

    //fillGeometry(vertices, indices);

    setPrimitiveType(PrimitiveType::Lines);
    setVertexData(vertices.constData());
    setIndexData(indices);

    //setStride(sizeof(QVector3D));
    qDebug()<<"stride size: "<<2*sizeof(QVector3D)+sizeof(uint);
    setStride(2*sizeof(QVector3D)+sizeof(uint));

    setBounds(m_P0, m_P1);
    addAttribute(Attribute::PositionSemantic, 0, Attribute::F32Type);
    addAttribute(Attribute::IndexSemantic, 2*sizeof(QVector3D), Attribute::U32Type);
    //addAttribute(Attribute::NormalSemantic, 2*sizeof(QVector3D)+sizeof(uint), Attribute::F32Type);
    //I dont need normals but without the above line I get a warning: QSSG.warning: Failed to bind attribute attr_norm

    qDebug()<<"attributeCount: "<<attributeCount();
}
//---------------------------
ThanksJoão

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