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How do I use postprocess volume to darken places?

Hello everyone,

I wonder if it is possible to use post process volumes as area effect, like darken certain places which can be seen from outside the affected volume. I don't mean unbound setting, because that makes the whole scene affected, I just want to affect what is inside the volume, but see it from the outside. Is there any setting like this, or other technique which yields the same or similar result?

Thanks in advance, Peet

Product Version: UE 4.15
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asked Jun 21 '17 at 07:51 PM in Rendering

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Peet3D
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Well, you can't do that with post process volume directly, but you can assign a bendable post-process material to an unbound post process volume. In this material you should be able to selectively darken certain areas, using something like Boxmask3D material function.

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answered Jun 21 '17 at 08:17 PM

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Deathrey
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avatar image Peet3D Jun 22 '17 at 10:07 AM

It sounds good enough, but can you show a sample material using this boxmask3d? I couldn't find anything about this function. :(

avatar image worldlearner0411 Mar 26 '18 at 11:53 PM

Deathrey, would it be possible to show a demonstration of what you are describing here?

avatar image NullBlack Sep 12 '18 at 07:20 PM

Not sure, but I think this is what Deathrey means. Not sure if there's a way to add volumes to select the dark or "lit" portions of the map, so you'd basically have to make a new material or instance for each map, though.

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