unsafe void SetPreconvolvedAmbientLightProbe(ref ShaderVariablesVolumetric cb, HDCamera hdCamera, Fog fog)
        {
            SphericalHarmonicsL2 probeSH = SphericalHarmonicMath.UndoCosineRescaling(m_SkyManager.GetAmbientProbe(hdCamera));

            probeSH = SphericalHarmonicMath.RescaleCoefficients(probeSH, fog.globalLightProbeDimmer.value);
            ZonalHarmonicsL2.GetCornetteShanksPhaseFunction(m_PhaseZH, fog.anisotropy.value);
            SphericalHarmonicsL2 finalSH = SphericalHarmonicMath.PremultiplyCoefficients(SphericalHarmonicMath.Convolve(probeSH, m_PhaseZH));

            SphericalHarmonicMath.PackCoefficients(m_PackedCoeffs, finalSH);
            for (int i = 0; i < 7; i++)
            {
                for (int j = 0; j < 4; ++j)
                {
                    cb._AmbientProbeCoeffs[i * 4 + j] = m_PackedCoeffs[i][j];
                }
            }
        }
 unsafe void UpdateShaderVariableslVolumetrics(ref ShaderVariablesVolumetric cb, HDCamera hdCamera, in Vector4 resolution, int frameIndex)