A node used to add local fog with the volumetric fog effect. [FogVolume]s are used to add localized fog into the global volumetric fog effect. Performance of [FogVolume]s is directly related to their relative size on the screen and the complexity of their attached [FogMaterial]. It is best to keep [FogVolume]s relatively small and simple where possible. Sets the size of the [FogVolume] when [member shape] is [constant RenderingServer.FOG_VOLUME_SHAPE_ELLIPSOID] or [constant RenderingServer.FOG_VOLUME_SHAPE_BOX]. [b]Note:[/b] Thin fog volumes may appear to flicker when the camera moves or rotates. This can be alleviated by increasing [member ProjectSettings.rendering/environment/volumetric_fog/volume_depth] (at a performance cost) or by decreasing [member Environment.volumetric_fog_length] (at no performance cost, but at the cost of lower fog range). Alternatively, the [FogVolume] can be made thicker and use a lower density in the [member material]. Sets the [Material] to be used by the [FogVolume]. Can be either a [FogMaterial] or a custom [ShaderMaterial]. Sets the shape of the [FogVolume] to either [constant RenderingServer.FOG_VOLUME_SHAPE_ELLIPSOID], [constant RenderingServer.FOG_VOLUME_SHAPE_BOX], or [constant RenderingServer.FOG_VOLUME_SHAPE_ELLIPSOID] or [constant RenderingServer.FOG_VOLUME_SHAPE_WORLD].