Enable Or Disable Fog In A Specific Area | No Fog Inside Buildings - Unreal Engine 4 Tutorial

Hey guys, in today's video, I'm going to be showing you how to create an area where the fog will either appear or disappear. This means that you can have it so when you enter a building, or go inside, there will be no fog and it will disappear. This will also smoothly transition between the two.
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00:00 - Intro
00:14 - Overview
00:40 - Tutorial
06:57 - Final Overview
07:20 - Outro
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[@TheF4c3m4n]

This is cool and could be used in so many ways! Thanks Matt. I actually needed something like this.

[@MattAspland]

Thank you and no problem! Happy to help and glad you can utilise this :)

[@dage6131]

Freaking awesome Tutorial, i have a question, Is there a way to keep the fog from dissappearing when entering the building, making it to where you can look out the window and still see the fog outside the house.

[@DarkUndeadSpawn]

I know this is a year ago but possibly setup box triggers on windows for when the player move towards the window the fog will appear but they need to be close, The fog will appear. Move away and it will disappear. It will need tweaking to your liking.

[@vandercomics]

Matt you are a real hero when it comes to the unreal dev community!

[@MattAspland]

Thank you! Happy to provide and help everyone out! :)

[@1d33f1x3]

This was a big help, thank you!

[@MattAspland]

Great to hear man, happy to help! :)

[@JustZiReacts]

Awesome work. Thanks so much❤

[@MattAspland]

Thank you and no problem! :)

[@kevCarrico]

great video - thank you!

[@lordtalosgaming1448]

Not exactly what I was looking for (I was trying to make the fog truly local, so if you looked out the window, there'd still be fog outdoors), but I still love the video as I learnt something that may be of use in the future. Could you do a tutorial on how to achieve what I described? Thanks

[@aviationengine6701]

Did you find a solution?

[@skateboardingfather6629]

If people that use unreal only knew of ur channel u provide content no one is thinking of but is very useful

[@MattAspland]

Ah thank you, I’m glad so many do enjoy it already! Happy to provide content for you! :)

[@hasnomoney1800]

I am surprised google has found this video for me especially when I misspled fog and called it dog. So what I googled was "how to get dog not inside building"

[@Nozera]

nice! thx.

[@m249tacticalsamurai8]

Thank you!. your videos and like puzzle pieces to make a game!.

[@MattAspland]

No problem! Glad to help and have fun putting them all together to create the final piece :)

[@jomoswagos]

thumbs up 🙂

[@s.e.c.u.8340]

Nice

[@abdullahsohail5395]

Thanks alot that will help me alot

[@MattAspland]

No problem, happy to help! :)

[@Alex00m]

This is cool, iam going to do this 😃😎👍

[@MattAspland]

Thanks, glad you can utilise it! :)

[@Christpy]

Is there a way to get the same effect via the Editor window and not just in play Mode ? How I can enable the fog effect when I'm in the box with the camera in editor mode ? Right now it work perfectly, but I actually need to be in play mode each time if I want to see the result of my Fog settings and I can't edit it correctly in Edit mode. Thanks

[@coldheist]

Thanks Matt. but what if fog in one place for example (fog in a room or storage )

[@vandercomics]

If you have any knowlage of networking, could you do some tutorials on gamemodes like capture the flag and conquest?

[@MattAspland]

I don't have too much experience in networking, but maybe I could take a look if I get some time :)

[@ChrisCohen]

Just a quick note to say this method won't work with volumetric fog that has been added to an exponential height fog actor, because volumetric fog doesn't support start distance (it's fixed at 0). As a workaround, you can use this method to flip it completely on or off, with the drawback that it's pretty obvious when it switches on and off. A more convincing solution would be to interpolate the actual amount of volumetric fog using this method, as in the fog density, but you'd need to store the original density somewhere as a variable so that it can return to that density later.

[@Si-Toecutter]

Bro, Ive been trying this, and As Ive got volumetric fog enabled then I have no access to start distance so ive done a simple set actor hidden in game connected to the expfog upon overlap but its not working, also tried set visibilty... could be the issue i was having the other day with set actor hidden? 4.25

[@lordtalosgaming1448]

not sure if it's relevant, but when I was working with exponential height fog, I noticed that setting shadow quality to low ensures the start distance and max opacity works properly, but setting shadow quality to medium or higher breaks it.

[@JupiterSaturn69]

How would you set it up to enable or disable volumetric fog in different areas?

[@kevCarrico]

get rid of the timeline and the lerp, and use Set Volumetric to turn it on and off.

[@ismet3001]

Can we apply this tutorial for a top down roof? Like the roof of a building is going to disappear slowly when the player goes inside.

[@MattAspland]

Yeah you could do that, do the same thing with the timeline but with visibility or opacity, I can’t remember the exact name right now. If you need help setting it up let me know :)

[@adrianpluville5938]

My problem is quite the opposite; I want the fog to show INSIDE a building, but I just can't make it appear in the interior.. the fog just stays outside. How do I make them appear inside buildings too?

[@TR-707]

ok but then if you look outisde there will be no fog? that seems kinda wrong ehh

[@aviationengine6701]

Did you find a solution?

[@Majestic_Graphics]

this was simple and interesting as I have a question. I'm using UDS (ultra dynamic sky) in my project, and I have a floating island in space,.. IS IT possible to keep the height fog inside of the dome & and not run on infinitely as I go into space ?? I'm trying to accomplish this and it is cramping the style of immersion I'm trying to create... Any Help?

[@vrver2802]

so when you look outside from a door inside .... no fog seems lame!!

[@shashhh_]

this doesn't seem to work for me ;3

[@lexxrelaxx2016]

Can we do this fog more smoky? I mean more claudy maybe?

[@Xperto_]

Or you could use particles

[@MattAspland]

Yep you could do that too, might be more efficient for not as powerful computers too

[@Xperto_]

@@MattAspland yeah but it also would allow you to see the fog outdoors, and you can still use exponential fog btw, you can have volumetric materials applied to volumes spawn in a niagra emitter

[@MattAspland]

Yeah, all great ideas. Just about experimenting with them and seeing which ones you prefer and think suit best for your game :)

[@Xperto_]

@@MattAspland yeah, if I was to get back into UE I'd definitely try this out. Fun stuff

[@MattAspland]

Yeah definitely, lots of different opportunities and ways of doing things.

[@greengamerguy623]

This is misleading and a let down obviously you can just turn it down but then outside will look like shit out of windows thanks, but this is useless imo.