Rolling fog and/or other FX (Floating particles)?

Hi , I was wondering how one would go about doing ... like say I make a fog image to go over top of a map, how would one be able to make it move?

I was also wondering as a side question if it would be possible to create your own rain effects and other particles for like *falling particles* effects on a map in Javascript? This is all a little new to me, and I know a wee bit of Javascript, but I'm just not sure if that is possible or not to be used in here :)

Sorry if these questions were a bit of a convoluted mess. Either way MV is awesome, I am saving up for a copy and utilizing the trial and I am just absolutely in love with what all you can do with it so far :D

I believe you could probably reach a basic fog effect through the use of image manipulation events.

Hopefully somebody will come up with a plugin or system where we can use the full effects of WebGL and pixi.js to create these types of things...

making an animation file and call it via event?

Galv has brought out a layers script today (on phone so cannot give link) which does what you want.  Search for it in plugin releases.