[Interest] Qt3D custom geometry

[Igor Mironchik]

Hello,

What is wrong in this geometry? I expect vertical triangle, but I got a 
mess.

// 3 distinct vertices
    QByteArray vertexBufferData;
    vertexBufferData.resize(3 * (3 + 3 + 3) * sizeof(float));

    // Vertices
    QVector3D v0( 0.0f, 0.0f, 0.0f );
    QVector3D v1( -1.0f, 1.0f, 0.0f );
    QVector3D v2( 1.0f, 1.0f, 0.0f );

    QVector3D n( 0.0f, 0.0f, 1.0f );

    // Colors
    QVector3D red(1.0f, 0.0f, 0.0f);
    QVector3D green(0.0f, 1.0f, 0.0f);
    QVector3D blue(0.0f, 0.0f, 1.0f);

    QVector<QVector3D> vertices = QVector<QVector3D>()
            << v0 << n << red
            << v1 << n << blue
            << v2 << n << green;

    float *rawVertexArray = reinterpret_cast<float 
*>(vertexBufferData.data());
    int idx = 0;

    Q_FOREACH (const QVector3D &v, vertices) {
        rawVertexArray[idx++] = v.x();
        rawVertexArray[idx++] = v.y();
        rawVertexArray[idx++] = v.z();
    }

    // Indices (3)
    QByteArray indexBufferData;
    indexBufferData.resize(3 * sizeof(ushort));
    ushort *rawIndexArray = reinterpret_cast<ushort 
*>(indexBufferData.data());

    rawIndexArray[0] = 0;
    rawIndexArray[1] = 1;
    rawIndexArray[2] = 2;

    vertexDataBuffer->setData(vertexBufferData);
    indexDataBuffer->setData(indexBufferData);

    // Attributes
    Qt3DRender::QAttribute *positionAttribute = new 
Qt3DRender::QAttribute();
positionAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
    positionAttribute->setBuffer(vertexDataBuffer);
positionAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
    positionAttribute->setVertexSize(3);
    positionAttribute->setByteOffset(0);
    positionAttribute->setByteStride(9 * sizeof(float));
    positionAttribute->setCount(3);
positionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());

    Qt3DRender::QAttribute *normalAttribute = new Qt3DRender::QAttribute();
normalAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
    normalAttribute->setBuffer(vertexDataBuffer);
normalAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
    normalAttribute->setVertexSize(3);
    normalAttribute->setByteOffset(3 * sizeof(float));
    normalAttribute->setByteStride(9 * sizeof(float));
    normalAttribute->setCount(3);
normalAttribute->setName(Qt3DRender::QAttribute::defaultNormalAttributeName());

    Qt3DRender::QAttribute *colorAttribute = new Qt3DRender::QAttribute();
colorAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
    colorAttribute->setBuffer(vertexDataBuffer);
colorAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
    colorAttribute->setVertexSize(3);
    colorAttribute->setByteOffset(6 * sizeof(float));
    colorAttribute->setByteStride(9 * sizeof(float));
    colorAttribute->setCount(3);
colorAttribute->setName(Qt3DRender::QAttribute::defaultColorAttributeName());

    Qt3DRender::QAttribute *indexAttribute = new Qt3DRender::QAttribute();
indexAttribute->setAttributeType(Qt3DRender::QAttribute::IndexAttribute);
    indexAttribute->setBuffer(indexDataBuffer);
indexAttribute->setVertexBaseType(Qt3DRender::QAttribute::UnsignedShort);
    indexAttribute->setVertexSize(1);
    indexAttribute->setByteOffset(0);
    indexAttribute->setByteStride(0);
    indexAttribute->setCount(3);

    customGeometry->addAttribute(positionAttribute);
    customGeometry->addAttribute(normalAttribute);
    customGeometry->addAttribute(colorAttribute);
    customGeometry->addAttribute(indexAttribute);

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