Volumetric Fog Exclusion Volumes

[HG_SB]

It would be great to be able to place volumes in a scene create cutouts for volumetric fogs.
E.g. if you have a foggy street and there is a house with an open door, you do not want to have fog inside the house and placing multiple fog volumes just to exclude small areas may not be a realistic alternative depending on your scene setup.

[Ruchir]

Bump

[kripto289]

You can do something like that (as a temporary solution) and in the center you can place your home

[HG_SB]

@kripto289

You can do something like that (as a temporary solution) and in the center you can place your home

Currently we have to decide between either doing that or just having the fog in there and trying to hide it.
Having exclusion/cutout volumes would greatly improve the setup workflow and maintainability of larger scenes.

[HIBIKI_entertainment]

@HG_SB

It would be great to be able to place volumes in a scene create cutouts for volumetric fogs.
E.g. if you have a foggy street and there is a house with an open door, you do not want to have fog inside the house and placing multiple fog volumes just to exclude small areas may not be a realistic alternative depending on your scene setup.

I actually see your point.

You could use the fade distances to work this a little better as well as the custom blends selection it give you a slightly closer require ment to what you need.

The only other thing, is since volumes are additive you could have a smaller local fog volume in front of your door, masking any particular nasties of the through look you’re going for.
By the sounds of it though you probably want even more finite control than that.

[Ruchir]

@HIBIKI_entertainment

I actually see your point.

You could use the fade distances to work this a little better as well as the custom blends selection it give you a slightly closer require ment to what you need.

The only other thing, is since volumes are additive you could have a smaller local fog volume in front of your door, masking any particular nasties of the through look you’re going for.
By the sounds of it though you probably want even more finite control than that.

This kind of setup is hard to manage especially if it’s a big enough level or procedurally generated.

Say we use something like Gaia or any prefab placer to populate level with houses(or house like structure) and we want a global fog and as you guessed not inside the structure, well you can’t expect anyone to place every single fog volume required by hand to avoid adding fog inside a house.

It’s just not feasible currently, we need a layer-based system for this. Say we want a room filled with fog, which won’t be possible if we just have a single layer system either. So, (ideally) it will be something like a CSG system to model the fog volume.

[HIBIKI_entertainment]

@Ruchir

This kind of setup is hard to manage especially if it’s a big enough level or procedurally generated.

Say we use something like Gaia or any prefab placer to populate level with houses(or house like structure) and we want a global fog and as you guessed not inside the structure, well you can’t expect anyone to place every single fog volume required by hand to avoid adding fog inside a house.

It’s just not feasible currently, we need a layer-based system for this. Say we want a room filled with fog, which won’t be possible if we just have a single layer system either. So, (ideally) it will be something like a CSG system to model the fog volume.

I hear you and yes unfortunately it does seem like no ease at scale.

If you are using Gaia/ Gena then I recommend utilising the extensions system.
Or even applying the density to the prefab level at door points controlling from there.
CSG would be great, but that involves a lot on the source side.

More tlc on the local fog volumes is certainly on the way.

[chap-unity]

@HIBIKI_entertainment

More tlc on the local fog volumes is certainly on the way.

You are totally right that it’s a pain point and while there is some workaround, they are not really practical.
We are aware of this and while I can’t give you any timeframe, some improvements are currently being done to address this like being able to multiply instead of just “adding” !

[HIBIKI_entertainment]

@chap-unity

You are totally right that it’s a pain point and while there is some workaround, they are not really practical.
We are aware of this and while I can’t give you any timeframe, some improvements are currently being done to address this like being able to multiply instead of just “adding” !

Nice to have an update Chap, thanks.

[lacas8282]

Any news?

[HIBIKI_entertainment]

@lacas8282

Any news?

2022 LTS released in June 2023.
All versions from then support Blending Modes on Local Fog Volumes.

This post can be resolved and closed now.