Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Pixelated textures


For some reason when the light hits a very reflective surface, it scatters along in visible pixels. To add more, when moving the camera further from the mesh, it begins pixelating even more.

alt text

alt text

If you know any solutions for this matter, I would really apreciate if you could help me out.

Product Version: UE 4.14
22.png (706.6 kB)
11.png (1.7 MB)
more ▼

asked Mar 02 '17 at 03:16 AM in Rendering

avatar image

6 4 6

avatar image Black Phoenyx Mar 02 '17 at 07:53 AM

Do you have noise setup in the materials? That looks like noise to me

avatar image DayDead Mar 02 '17 at 03:05 PM

No I haven't, I just plugged the textures in the material node and that's it. I added multiply and scalar parameters to change the roughness maps and that's it. It's strange because even the materials in the starter content folder looks like this.

avatar image Black Phoenyx Mar 02 '17 at 09:08 PM

Do you have a post process volume setup in your level? Is there anything in there that could be causing it? Try disabling AA or change the type

avatar image DayDead Mar 02 '17 at 11:53 PM

I have a post processing volume but even after I delete it, change the aa type or disable it, the problem still persists

avatar image Black Phoenyx Mar 03 '17 at 12:13 AM

Is that effect seen on all materials in the scene or just a few? What do the textures look like?

avatar image DayDead Mar 03 '17 at 01:34 AM

Only the very reflective materials. I tested to see if the Steel material from the Starter Pack is affected as well and yes it is. The textures have basic configurations, I tested them in another unreal project and they are fine. I think it has something with the rendering settings, however the Project settings are the same to any other unreal project I have. I changed each and every setting just to check if the problem can be erased but unfortunately it didn't work.

I noticed that when you move the camera, some sort of grain effect moves too. I disabled the grain effect in the post processing volume but the problem still persists. Apparently it happens only when the light barely hits the surfaces. When you place the meshes to a light source, the problem disappears but when the mesh is in a shadow-ish place, the strange phenomenon activates again.

avatar image Black Phoenyx Mar 03 '17 at 01:52 AM

Do your UVs on the meshes seem normal? Here's a video from an older issue I helped with, let me know if your textures also react as the ones in the video do: https://youtu.be/LfWXAwtIaFo

It was a texture for landscape but it is the effect I am trying to get a grasp on that you are seeing so the video should suffice for a demo without me needing to make a new one to upload...let me know, the reactions are around the 10 second mark and you'll see as the camera moves they go crazy....is that the same effect you are seeing?

avatar image DayDead Mar 03 '17 at 03:23 AM

Yes, something like that but it's way more subtle. My UV's are standard and economically packed. I doubt it's because of the UV because when I tested the meshes in another ue project, the effect wasn't there.

But still, may I ask if you could please tell me how you fixed that issued presented in the video? I think it's worth giving a try.

avatar image Black Phoenyx Mar 03 '17 at 03:31 AM

Do you have a sphere reflection capture in your scene? What is the specular settings in the materials?

Looking back in my notes that issue was solved through the textures and adjusting AA....if the textures work fine in another project that limits the cause to your current scene so we should start narrowing down what it could be.

avatar image DayDead Mar 03 '17 at 03:49 AM

Yes I do have one and I do not use the specular map, only the roughness. I made a video to show exactly what's happening: https://www.dropbox.com/s/emtbu31ua3590lx/leveldesign%20%2839%29.mp4?dl=0

avatar image Black Phoenyx Mar 03 '17 at 03:59 AM

Lets try something...set your auto exposure to fixed at log 0 then build lighting and let me know if you still have the issue or if it changes any.

avatar image DayDead Mar 03 '17 at 09:02 PM

Sorry for the delay. Can you please guide me on how to change that?

avatar image Black Phoenyx Mar 03 '17 at 09:40 PM

In your level viewport, click on the view mode button (Lit in your screen shots) then at the bottom you will see Exposure click that and in the sub menu select Fixed at Log 0

avatar image DayDead Mar 03 '17 at 10:25 PM

I tried that but the only change happened after the built was the lighting intensity, the problem still persists.

avatar image Black Phoenyx Mar 03 '17 at 10:28 PM

Hmmm...it really looks like specular noise to me but I can't think of what else in your scene that could be causing it...

avatar image DayDead Mar 03 '17 at 10:45 PM

It looks like noise indeed but I didn't add any noise parameter in the material editor, i don't even use the specular input.

I don't have any idea either but thank you very much for the time given to my problem. I really appreciate it! I will surf the internet some more to find something that can obliterate this phenomenon.

avatar image Black Phoenyx Mar 03 '17 at 10:52 PM

Try giving the specular an arbitrary value of like .5 from a float constant.....we know whatever the cause is it is only in that scene and only in the shadows or near shadows

avatar image DayDead Mar 04 '17 at 06:00 AM

Tried that but no success. I imported my assets in another scene and they work perfectly. No idea what else we could try.

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

0 answers: sort voted first
Be the first one to answer this question
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question