Site Scan allows you to create contour files representing elevation without the need of any third party software. You can export these files in .dxf or .shp format.
Contour files are automatically generated after the flight is processed, Site Scan uses the DTM (Digital Terrain Model) to create these lines. To make sure the contour files are generated to your desired interval, you can modify the default value in the project’s Output Settings which can be found inside the Project's hub.
You can also modify the interval value after the files are created directly on the flight’s 2D view. You only need to click the save button after modifying the settings and it will take around 5 minutes to generate the new files.