You have seen earlier that Thea will use and import SketchUp colors and texture images in the test renders. Luckily, most outdoor materials have a matte appearance that can be well represented with the default material properties. So, all you need to do to achieve a realistic rendering is to tweak the materials that are already set up from SketchUp.
For indoor scenes, you will want to replace most of the materials with special optical characteristics that are not available in SketchUp. These are: