By default, this is set to 4. This setting affects how the light source is treated during ray tracing processing (only), most noticeably in any...

By default, this is set to 4. This setting affects how the light source is treated during ray tracing processing (only), most noticeably in any shadows cast by the light source. Higher Samples values produce smoother shadows at the expense of longer processing time. Typically, this setting is left at the default until final renderings are being produced. To eliminate gaps or facets in a rendering which setting do you adjust?