*.objformat file. In order to do that, use common software, e.g. Blender, Autodesk Maya, 3D Studio Max, Adobe Photoshop or various CAD systems.
Load occlusion modelto upload a 3D image, e.g. walls of a room. Occlusions will appear in the Environment Editor as red barriers. The location and scale of occlusions is configured by entering the coordinate values in the right part of the window, or by moving the axes on the layout itself.