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Any side of mesh facing down is black HELPPPPP :(

alt textHey! im losing my freakin marbles trying to figure this out, any help you can provide would be MOST appreciated...I have tried, different engine versions, imported multiple basic meshes( simple cubes, properly unwrapped) I have had no problems at all and then randomly yesterday, any side that faces down goes black, I even used the Unreal engine Basic Shapes ,I also rotated the meshes to see if it was the one side, but nope, ANY side facing down goes black.....ive attached a photo for reference. arg...hoping someone could shed some light on this little predicament. have a great day :) alt text

Product Version: UE 4.21
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asked Feb 14 '19 at 11:06 AM in Using UE4

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2 answers: sort voted first

I think that's the face culling you're seeing.

You can resolve this by either making the material double sided or inverting the face normals of that specific face. Well that's the case when you are in that cube, from the other side it should be normal. Otherwise it might be a different issue, but I can't see that in the picture.

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answered Feb 14 '19 at 11:59 AM

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avatar image Nate1232 Feb 14 '19 at 12:06 PM

Hey! yes, the other side is normal,however making material double sided, aswell as geometry didnt help, I have tried that already :( im losing my freakin mind lol, just randomly started happening :(

avatar image yvangucht Feb 14 '19 at 12:07 PM

What about the lightmap UV?

avatar image Nate1232 Feb 14 '19 at 12:12 PM

It all seems fine :S i honestly dont know what the heck is going on, all morning I have been making simple shapes in blender, unwrapping them, importing them, and any face that is facing down, is black lol. I have always used 'generat lightmap uv' when importing with no problem :(

avatar image yvangucht Feb 14 '19 at 01:02 PM

Sometimes it fails to generate a proper light map, can you show the lightmap density? and also maybe a screenshot of the mesh in Unlit mode?

avatar image Nate1232 Feb 14 '19 at 01:28 PM

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avatar image Nate1232 Feb 14 '19 at 01:29 PM

I hope those are what you meant mate..i am so dam confused lol

avatar image yvangucht Feb 14 '19 at 01:34 PM

It being black would make sense if there's no light source in the cube, as the unlit mode and light map density show up correctly. What are you trying to achieve exactly?

avatar image Nate1232 Feb 14 '19 at 01:42 PM

sorry, to clarify, even if i put a light inside the cube, every wall lights up except the one faceing down, unless i drag i across the surface of the side facing down, then i can see the texture

avatar image Nate1232 Feb 14 '19 at 01:53 PM

so...the 2 messages i sent have been sent to be reviewed by a moderator lol, no idea, i did say i was fed up and maybe my pc just sucks..i did swear though so maybe thats why lol. anywho, im sorry for wasting your time mate, thank you so much for your help, ill keep messing around with it and maybe figure it out lol

avatar image yvangucht Feb 14 '19 at 01:56 PM

If you need a cube viewed from the inside I'd suggest just inverting all the faces? Would that be a passable workaround?

avatar image Nate1232 Feb 14 '19 at 02:01 PM

i guess i could do that, still super curious as to why the heck i am having this problem lol. anywho, thanks again mate. Have an awesome day! :) preciate the assistance buddy

avatar image yvangucht Feb 14 '19 at 02:03 PM

No problem buddy, sometimes (a lot of the times) Unreal can be an annoying piece of software. Best way to solve something most of the times is to work around it ;) Good luck!

avatar image Nate1232 Feb 15 '19 at 02:48 PM

hey dude, didnt work unfortunately, i imported the object wiht flipped faces and it still pitch black, if it faces down(which is kinda poop as it is supposed to be a ceiling lol). anywho, ill be here if you happen across a solution lol. if not, dont worry dude, ill figure it out eventually

avatar image Nate1232 Feb 15 '19 at 02:50 PM

apologies for bothering you so much mate. I am just trying to figure out why every part of a mesh i import that faces down, turns black, i just imported another cube, and as I rotate the cube, the side that starts to face down, slowly turns black, as i drag a light across the surface i can see the texture though...its the same across every enigne I have tried...im sorry for bothering you dude. I am baffled, maybe my pc is fuckin up ,i dunno lol.

avatar image Nate1232 Feb 15 '19 at 02:50 PM

hmm, my last comment just dissapeared lol. urg, its ok mate, thank you very much for the help, im really sorry to waste your time. maybe my pc is fucking up lol. i dunno

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Hey, I've been thinking about this, but this actually makes a lot of sense since the bottom face does not receive light form your directional light. This can be fixed by increasing the indirect light value in the directional light (or atmospheric fog) and baking!

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answered Feb 15 '19 at 08:08 AM

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