This method is of use in big, open outside locations with a wide range of camera view. Elements of terrain with Texture Paint and building are useful here. Prepared object with low detail level should match in colour with the original object, so it is the best to prepare the texture using screen capture. Lightmaps are also generated with the same light sources as the basic parts of the location. Simplified geometry has to be in the same position as the original one (the picture below presents the visual schema).