The role of AO can strengthen the details of the picture and make the surface more obvious. Especially for European space, it is very practical. In the past, there were several kinds of diagrams made by AO, all of which were manually adjusted at first, and then gradually there were plug-ins made by AO. Of course, all versions above VR 1.5 now have this function. In the column of indirect lighting, it is called-ambient light occlusion in Chinese, if you have time.