Do decal textures stream? / what does "decal mipmap level" do?

Development Asset Creation
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1

I’m unsure if deferred decals stream, we had a lot of issues with certain decal textures just being super blurry in game so ended up setting all our decal textures to not mip, which isn’t a great solution. On the Decal Actor User Guide page, which seems to have been written for 4.9, it says under current limitations:
“Streaming is not yet hooked up so make sure the texture is not streamed.”

Is that still true?

Also how does the “Decal Mipmap Level” node work? I don’t know why that would be there if decal textures don’t stream? I can’t find any information on how to actually use it or what it’s supposed to do, is my assumption on hooking it up (attached) correct? Still don’t know what it actually does though and there’s no documentation I can find about it

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2

I don’t know much about this area, but I believe you can adjust how much mips blur/don’t blur in the texture settings.

There should be a dropdown that let’s you select “sharpness1/2/3/4/etc.” or “blur1/2/3etc.” somewhere in the texture.

You could try just setting sharpness up to something really high instead of disabling mips altogether.

3

It’s not even that some decals are just a little blurry, there’s decals we had that were pretty much always on the lowest possible mip so just like a few pixels of almost solid color smudge stretched on a wall. But that’s without using the mysterious decal mipmap level node…

4

I’d like to bump this one. This has been asked in a few places (Decal Texture Streaming Question - Rendering - Unreal Engine Forums and repeated in the forums) and never answered.

Is the documentation part about decals not streaming still correct? I also get blurred decal textures more often than regular material textures, which would imply that they do stream, albeit poorly. Is there a reason why decals get blurry more often? Thank you.

5

I would like to know more about this. It seems my decals are always blurry and flicker in game when I am close to them, as though they are trying to steam but not actually doing very well at it. I have them all over my map for roads and they are causing a problem. If i click on the material they are made from I can get them to go high resolution but they always go back to blurry.