QQuick3DGeometry color not showing in point

I'm trying to add color to every point which i'm rendering in qml page. But its not working. Below is the main code which is creating the points and applying color on them. Here m_image is already set.

int NUM_POINTS = m_image.height() * m_image.width();;

m_bytes.resize(NUM_POINTS * stride);
float *p = reinterpret_cast<float *>(m_bytes.data());

for(int i=0;i<m_image.width();i++) {
    for(int j=0;j< m_image.height();j++) {
        *p++ = float(i)/100;
        *p++ = float(j)/100;
        QRgb rgb = m_image.pixel(i,j);
        const int gray = qGray(rgb);
        *p++ = float(gray)/100;

        QColor color = QColor::fromRgb(rgb);
        *p++ = color.red();
        *p++ = color.green();
        *p++ = color.blue();
        *p++ = 1.0f;
    }
}

setVertexData(m_bytes);
setStride(stride);
setBounds(QVector3D(-5.0f, -5.0f, 0.0f), QVector3D(+5.0f, +5.0f, 0.0f));

setPrimitiveType(QQuick3DGeometry::PrimitiveType::Points);

addAttribute(QQuick3DGeometry::Attribute::PositionSemantic,
             0,
             QQuick3DGeometry::Attribute::F32Type);
addAttribute(QQuick3DGeometry::Attribute::ColorSemantic,
             0,
             QQuick3DGeometry::Attribute::F32Type);
update();

Here the points position are ok but the color is not correct.

Searched internet for solution

I've tested your example code with this image and all the points were painted black. I used DefaultMaterial.NoLighting in the DefaultMaterial assigned to the model containing the geometry which worked for me.
The only issue is the flipped image, but you will figure out how to properly position the camera in your project.

View3D {
    anchors.fill: parent
    camera: PerspectiveCamera {
        position: Qt.vector3d(60, 60, 210)
    }

    Model {
        scale: Qt.vector3d(100, 100, 100)
        geometry: ExampleTriangleGeometry {}
        materials: [
            DefaultMaterial {
                lighting: DefaultMaterial.NoLighting
            }
        ]
    }
}

void ExampleGeometry::updateData()
{
    clear();

    // PositionSemantic: The attribute is a position. 3 components: x, y, and z
    // ColorSemantic: The attribute is a vertex color vector. 4 components: r, g, b, and a
    int stride = 7 * sizeof(float);

    QByteArray vertexData(m_image.width() * m_image.height() * stride,
                          Qt::Initialization::Uninitialized);
    float *p = reinterpret_cast<float *>(vertexData.data());

    for (unsigned y = 0; y != m_image.height(); ++y) {
        for (unsigned x = 0; x != m_image.width(); ++x) {
            *p++ = x * 0.005f; // x
            *p++ = y * 0.005f; // y
            *p++ = 0.0f;       // z

            QColor c = m_image.pixelColor(x, y);

            *p++ = c.redF();
            *p++ = c.greenF();
            *p++ = c.blueF();
            *p++ = c.alphaF();
        }
    }

    setVertexData(vertexData);
    setStride(stride);

    setPrimitiveType(QQuick3DGeometry::PrimitiveType::Points);

    addAttribute(QQuick3DGeometry::Attribute::PositionSemantic,
                 0,
                 QQuick3DGeometry::Attribute::F32Type);

    addAttribute(QQuick3DGeometry::Attribute::ColorSemantic,
                 3 * sizeof(float),
                 QQuick3DGeometry::Attribute::F32Type);
}