How to fix the seam in Skybox?

My unity version is 2017.3.0f3.
I use the build-in shader "Skybox/Panoramic".



It's a seam in the center, set the texture's wrap mode to clamp don't work.
Is i set something wrong?
Thanks.

 

Has any method to custom the skybox render?
I want add a pass and use different mesh, unity default mesh is very sparse at zenith.
I know this is a optimization, but sometimes i need dense mesh at zenith.

 

How about bigger textures?

 

don't work, 2048*1024:



i check the texture in photoshop, it's seamless.

 

I found the problem, don't generate mipmap works.
Thanks.

 

mipmaps, nice...
I hadn't even thought about using .dds files in Unity...

but makes sence that a skybox wouldn't need mipmaps

 

Wrap mode - Clamp also helps!

 

Wrap mode -> clamp and toggling off "generate mipmap" fixed my seam issues too, thanks @ROBYER1 and @chena_cpp !

 

Thanks! Looks like the "clamp" setting is what actually fixes it (at least on mine), the mip map setting doesn't affect the seams. However, as mentioned earlier, no need to generate any mip maps for a skybox anyways.

 

Thanks, these answers helped me out today as well

 

Edit: clamp fixed it, thanks

 

This is 2021 and you saved my day, Thanks a lot my dude !!

 

Neither clamp nor turning off mip-maps worked for me - the only solution was to lower the max resolution down from 8192 to 512

 

It worked ,Thanks bro

 

We can also use Skybox/Cubmap shader

 

I've hit this problem in the past. none of these things mentioned are exactly fixes - but compromises. the underlying problem is that the uv derivatives (or you can think of this as texel density) are used to select from the mip chain. if suddenly from one pixel to the next, u or v goes from 1 to 0 then you get a horrible seam. wrapping texture mode doesn't fix this since you aren't going from 1 to 1.01 or something like this... this can be /properly/ fixed by setting the derivatives (newer shader models) or using better mip selection in the shader (older shader models)

mip selection by texel density is a relatively good, near catch all solution (which selection by distance is not, for example) - but it does hurt us sometimes.

for a skybox its not so bad. but if you want to e.g. raytrace a sphere in a shader (which is really fast and useful) then apply a cylindrical texture map, or use something like stereographic projection, you will get the same class of problem.

 

This is still broken in 2021 LTS!!
You can turn off mip-maps to fix it seems, but it's possible you might need them for material effects
You can change the image type and the material type to cubemap, possibly degrading the image in the process...

 

thanks, bro................

 

After switching to Unity 22.3 LTS I found issues with loading skybox Textures at runtime through UnityWebRequest, the seams came back.
Here is the solution mybe this is useful for somebody:

Code (CSharp):

1.  IEnumerator LoadTextureAsync(string url, Action<Texture2D> callback)
2.     {
3.      
4.         using (UnityWebRequest uwr = UnityWebRequestTexture.GetTexture("file://" + url))
5.         {
6.            
7.             yield return uwr.SendWebRequest();
8.  
9.  
10.             print("file://" + url);
11.  
12.             if (uwr.result == UnityWebRequest.Result.ConnectionError || uwr.result == UnityWebRequest.Result.ProtocolError)
13.             {
14.                 Debug.Log("Get File Error: " + uwr.error);
15.             }
16.             else
17.             {
18.              
19.            
20.                 Texture2D resulttemp= DownloadHandlerTexture.GetContent(uwr);
21.                 Texture2D result = new Texture2D(resulttemp.width,resulttemp.height, resulttemp.format, false);
22.                 result.SetPixelData(resulttemp.GetRawTextureData<byte>(),0);
23.                 result.Apply(false);
24.                 result.filterMode = FilterMode.Bilinear;
25.                 result.minimumMipmapLevel = 0;
26.                 result.wrapMode = TextureWrapMode.Clamp;
27.                 resulttemp = null;
28.                 callback(result);
29.  
30.             }
31.             uwr.Dispose();
32.             yield return null;
33.         }
34.     }