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Disabling "Apply Fogging" Doesn't Work For Translucent Shader With Volumetric Fog

I think this was working in 4.18, but as far as I can tell this does nothing in 4.19. I have some particles that I want to use to distort the scene, but they receive fog from the volumetric fogging and make the fog appear to be doubly thick where they appear because even though "Apply Fogging" is disabled, the fog is still applied to them when Volumetric Fog is enabled.

Is this a bug or a known issue? It prevents many possible visual effects with particles or other translucent objects.

Product Version: UE 4.19
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asked Apr 19 '18 at 03:41 AM in Rendering

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rujuro
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avatar image Spoondog Jun 11 '18 at 10:33 PM

I've just run into this too. Seems to be no way to stop something from having volumetric fog drawn in front of something. You should log it here if you haven't already: https://epicsupport.force.com/unrealengine/s/

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3 answers: sort voted first

I submitted the bug, but they say they cannot repro the issue. We fixed this internally with some shader code fixes, and due to deadlines I can't submit a sample project in the near term. Just wanted to update you.

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answered Jun 15 '18 at 08:53 PM

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rujuro
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avatar image Spoondog Jul 06 '18 at 02:45 AM

Thanks, I logged it again with a repro map. And here is an image to make this thread prettier.

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repro content 4.20 preview

avatar image Spoondog Jul 06 '18 at 07:28 PM
avatar image Luos Jan 09 '19 at 06:40 PM

was just looking into this, apparently the issue has been updated to "by design" bleh.

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Nicely done! Thanks for following up on that!

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answered Jul 06 '18 at 04:37 AM

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rujuro
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Huh, by design?? That seems very odd since it makes the fogging unusable in certain scenarios and was fixable by our graphics programmer. I can ask him how he fixed it if it might help others here.

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answered Jan 09 '19 at 07:35 PM

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rujuro
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