Wierd Ue3 display issue :/

konstruct

heyo- me again.
issue is:

1 bit alpha masked materials light and look fine, but when I apply a normal map I get a display error. I have all the latest drivers so past that I`m wondering if anyone else has run into this issue:



I hope the picture makes sense. basically around my alpha`d edges theres a bunch or random weird pixels that flash about like crazy when I do anything, as simple as moving the mouse.

Eric Chadwick

Did you normalize the normal map? If the UE3 shader doesn't re-normalize, you could get results like this.

Also does your normal map have pixel padding around the UV shells? Your problem could be caused by bad colors mipping in from the empty area of the map, which pixel padding helps solve. Also, what color do you have in the empty areas of the map? (should be 128,128,255 not black or something else)

konstruct

yeah I dont have any padding going on, but its a normal map created using 2d info, and all the negative mip space is indeed 128,128,256, so I figured padding was moot point?

normalize the normal map? Is this the import compression option for a normal map?

Eric Chadwick

http://wiki.polycount.net/Normal_Map#Renormalizing

( this is coming in handy)

konstruct

INTRESTING- I`ll have to give this a go when I get home- thanks capn` Chadwick! I`ve learned many a thing reading your posts so this is kick ass getting some personnel assistance

Ryan Clark

Hmm... I don't think normalization is the problem... non-normalized vectors shouldn't cause pixels to "flash about like crazy"... should they?

What happens if you remove your alpha-mask? Does the flashing-pixel-problem persist?

What happens if you switch to 8-bit alpha, instead of 1-bit?

konstruct

8 bit is 100% fine, though thats unlit so theres no normals or spec.

when the alpha mask is removed all is well. and the problem goes away. Another thing that might be of interest: I can have all my maps turned on, working error free when I turn off 2 sided rendering on the material base. 0_0

I`ll probably just end up doubling up my polygons, as thats what turning on 2 sided does anyways right?

Eric Chadwick

Ah, so it's probably a 2-sided issue then. Manually duplicate and flip the faces yourself, without the 2-sided flag, see if that works.

Mark Dygert

Something else to keep in mind...
Are you using Unreal to set it to 1-8bit or are you doing that in PhotoShop? Sometimes Unreal can be incredibly stupid about what pixels are transparent when it goes down in bit depth.