r.Lumen.TranslucencyVolume.SpatialFilter.StandardDeviation

When r.Lumen.TranslucencyVolume.SpatialFilter.Mode=1, The standard deviation of the Gaussian filter in Pixel. If a large value, the filter will become a cube filter. While when getting closer to 0, the filter will become a sharper Gaussian filter. Default to 5 meaning not a sharp flilter, close to a box filter for the default SampleCount of 3.