Ho yes it work on statics objects only sorry for the mistake. But it work with movable spot light, directional and omni light.
Anyway, i just mean that lot of motor now start to propose powerfull RT GI technology (or pre-backed), and UE4 will for sure propose a technology like this in the close futur. It already porpose it in beta (but doesn’t work properly really… and is really not effective in different scales in unic level…but : it work with movable objects !)