How can I recreate this awesome fog/cloud effect in HDRP?

Unity Engine
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1

Hi all,

I’m pretty new to HDRP and trying to recreate this fog/clouds effect.

I’ve tried volumetric clouds and fog but really struggled to get it to work with the top down view and at a low elevation.
Any tips/tricks you can give me on how to get low volumetric fog like this?

2

Play with volumetric cloud height.

3

Search for fog in their book. Should at least get you started

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4

I have tried this, well the “Lowest Cloud Altitude” setting but when its set to the minimum the clouds still only seem to show up around 2000-2500m. It seems like the clouds are only designed to be clouds which makes sense but seems like a needless limitation.
I could push up my game world 2000m but its a pretty frustrating endeavour.

5

Thanks, that’s a great resource I didn’t know existed!

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6

Ok I did get it working somewhat, had to also change the “Cloud Thickness”, I got confused and thought this was the density, would be more clear as “Layer Thickness” or “Highest Cloud Altitude” to match the other setting… anyway.
Even then the lowest is for this setting 100m so you’re sorta stuck with between 0-100m as the minimum which is a bit frustrating.

It also seems like point lights are not supported for volumetric clouds? I couldn’t find any docs on this…
However if you turn on volumetric fog that does work with point lights and gives a pretty cool effect.

I’d also like to be able to change the color of the clouds but looks like that isn’t supported either.

7

Have to play with high and low as the cloud also will get too little resolution with a too wide a gap between those values, basically you just need to trial and error a lot to get effect you want in this non-scientific implementation of game rendering clouds.

(I do like them a lot, just there’s no true deterministic values / answers for a given effect other than learning how to do it by messing about since it can do all sorts of things but not in expected ways).

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