not periodically, but… say you have an archvis app and show a customer a design in different times of day. you can throw in a command and the customer will not complain. the command is
r.LumenScene.SurfaceCache.Reset
as posted by miguel a couple posts above.
in a game this is certainly not always possible, but i reckon even this ac mirage effect, posted above, could be done without the surface cache updating. just gotta make the cache rebuild part of the visual effect. that’s the thinking.