r.VolumetricFog.GridPixelSize volumetric fog pixel size
r.VolumetricFog.GridSizeZ volumetric fog Z depth
r.VolumetricFog.TemporalReprojection time effect accumulation
r.VolumetricFog.HistoryWeight Time effect cumulative length [frames]
r.VolumetricFog.Jitter jitter accumulation