Panoramic Skybox Shader having a seam/line

Hey!
So there is this issue, I created the skybox material to put panoramic 360 videos/pictures to the skybox.

The problem is, that there is a line where the edge is supposed to be, behind the camera.

Does anyone know how to make it disappear? Here is the problem, there is no picture/video selected, so it seems the material itself has this problem.

I started using the built in Panoramic Shader, but the issue is the exact same.

Is there a Unity settings I can set to make it disappear? Or is there a code fix for it? Anything?

 

Best reply:
https://answers.unity.com/questions/1484895/panoramic-skybox-has-white-seam-how-do-i-fix-that.html

 

Long story short - uncheck "generate mipmaps".

 

Thanks. This works! Just select the texture, look under the Advanced and uncheck "generate mipmaps".

 

my skybox texture is a 360 degree hdri image and the shader type is selected "skybox/panoramic".

there is no option not to generate mipmaps as far as I can see. what would you suggest?

 

this is an option on the image your using under the "Advanced" dropdown.

 

I don't see an Advanced dropdown on my editor, either on the material's Inspector, or on the Select Texture window, and there's no right-click menu I can find with it. No sign of a Generate MipMaps checkbox either.

 

That's probably because the setting is for the Texture, not the shader.

 

3 years late but I'm here just to thank you guys for this!

 

And the long reach.............. I just needed this answer. Thanx all!

 

The reason this happens is that the panoramic shader calls tex2D to retrieve the color from the texture, but that function automatically calculates the mipmap level based on the surrounding pixels and it breaks at the seam, since the x coordinate jumps from 1 back to 0 there. The shader could be fixed if tex2Dlod was called instead.

 

Have the same problem but as the texture is loaded from url I don't see how I can uncheck "Generate Mipmaps". Any idea?

 

thank you

 

Thanks!

 

love it!

 

I know this is old but if someone comes across this when they're attempting to dynamically load a new skybox at runtime from a dynamically loaded image, you can do it like the following (where "textureBytes" is the bytes of the loaded image):

Code (CSharp):

1. Texture2D loaded = new Texture2D(2, 2);
2. loaded.LoadImage(textureBytes);
3.  
4. // Create a new texture with mipmaps disabled
5. // This removes the seem in panoramic loaded shaders
6. _texture = new Texture2D(loaded.width, loaded.height, loaded.format, false);
7. _texture.SetPixels(loaded.GetPixels());
8. _texture.Apply();
9.  
10. Material _skyboxMaterial = new Material(Shader.Find("Skybox/Panoramic"));
11. _skyboxMaterial.SetTexture("_MainTex", texture);

 

A better solution that I came up with is to use the overload of

tex2D

that takes precomputed derivatives, and just compute them manually. Something that works is this:

Code (CSharp):

1.             float4 tex2Dwrap(sampler2D samp, float2 s)
2.             {
3.                 float2 dx1 = ddx(s);
4.                 float2 dy1 = ddy(s);
5.                 float2 s2 = float2((s.x + 0.5) % 1, s.y);
6.                 float2 dx2 = ddx(s2);
7.                 float2 dy2 = ddy(s2);
8.                 bool first = abs(s2.x - 0.5) > 0.25;
9.                 return tex2D(samp, s, first ? dx1 : dx2, first ? dy1 : dy2);
10.             }

Assuming that the discontinuity is at

x = 1

going back to

x = 0

, this basically moves it to

x = 0.5

and then picks the pair of derivatives that is farther from the discontinuity. The derivatives have to be computed up front and then chosen from because otherwise

ddx

/

ddy

would have caused another seam at the point they are split at.