// functions
    protected override void OneTimeInit()
    {
        if (m_normalVarianceSeed == -1)
        {
            m_normalVarianceSeed = UnityEngine.Random.Range(0, int.MaxValue);
        }

        m_passVariance  = AddPass <NPVoxNormalProcessorPass_Variance>();
        m_passNormalize = AddPass <NPVoxNormalProcessorPass_Normalize>();
    }
 protected override void OneTimeInit()
 {
     m_passFromMesh  = AddPass <NPVoxNormalProcessorPass_FromMesh>();
     m_passNormalize = AddPass <NPVoxNormalProcessorPass_Normalize>();
 }