We have just published a new release of Thea for SketchUp. It introduces the plugin’s User Interface & User Manual Translations in 8 Languages. Additionally, we have added Global Medium in the Environment tab with a new Fog Preset that allows control of fog density, base and top level. There is also a new Cloud material Preset for volumetric effects defined by a solid group/component. We have also prepared a blog article with two example scenes explaining the new fog functionality. Find more details and download links here.
I have attached below my own quick rendering of a very simple model found in 3d warehouse. I have been playing with the feature and produced it with a very little effort. It is interesting how the geometry gradually appears in a rendering when the fog is dense. I even prefer stopping the rendering before it completely clears to keep the noise still present. It looks more natural this way.