AO not accurate

Hi there
So I wanted to get AO output in blender of the whole scene. Now I know the traditional way.but rhe problem with it is… The distance is not accurate. The other possible way was applying AO MAT for every object, but that is also a hassle. If any of you used modo Or maya you know what I’m am looking for.are there any other way to manipulate and get accurate AO output in compositor