Read more about How to create 3D textures using SketchUp at CreativeBloq.com
The SketchUp plug-in for Maxwell Render offers a whole host of functions that enable the user to create a wide range of textured materials. If you’re specifically interested in creating a densely textured rug then Maxwell Grass is your friend. This feature (known as a Maxwell Render extension) can be accessed directly within the SketchUp interface via the SketchUp plug-in for Maxwell Render.
Source: CreativeBloq