public class OBJFaceVertex
{
    //------------------------------------------------------------------------------------------------------------
    public int m_VertexIndex = -1;
    public int m_UVIndex = -1;
    public int m_UV2Index = -1;
    public int m_NormalIndex = -1;
    public int m_ColorIndex = -1;

    public override int GetHashCode()
    {
        return m_VertexIndex ^ m_UVIndex ^ m_UV2Index ^ m_NormalIndex ^ m_ColorIndex;
    }

    public override bool Equals(object obj)
    {
        OBJFaceVertex faceVertex = (OBJFaceVertex)obj;
        return m_VertexIndex == faceVertex.m_VertexIndex
            && m_UVIndex == faceVertex.m_UVIndex
            && m_UV2Index == faceVertex.m_UV2Index
            && m_NormalIndex == faceVertex.m_NormalIndex
            && m_ColorIndex == m_ColorIndex;
    }
}