Godot: blue circle at the bottom of the default environment

[novemberist]

Operating system or device - Godot version:
Arch Linux, Godot master
Intel HD4000
Mesa 17.1.6

Issue description:
There is this light blue dot/circle at the bottom of the 3d scene with the default environment enabled, which looks like a very distant reflection of the sky. Is it supposed to be there?

Steps to reproduce:
Look into the abyss.

Link to minimal example project:

[ghost]

I had seen this weeks ago, then it disappeared. I think it's fixed. What is the exact commit you're using?

[novemberist]

The latest commit, from about 30 minutes ago. This thing has been there for ages, i first thought it was a new gizmo or something to lock the y axis ;)

[reduz]

Thay say it's a portal to a parallel dimension that opens up at the
eleventh hour of the Equinox. It may be a floating point precission error
too.

On Wed, Aug 9, 2017 at 8:53 AM, Poommetee Ketson [e-mail]
wrote:

I had seen this weeks ago, then it disappeared. I think it's fixed. What
is the exact commit you're using?

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[ghost]

Can't reproduce. But I think it's an issue with ProceduralSky. Try looking up too.
image
OpenGL ES 3.0 Renderer: Mesa DRI Intel(R) Sandybridge Mobile

Is it an older project by any chance? Does it happen in a newly created project?

[novemberist]

That thought crossed my mind, too. But it also happens with newly created projects. Maybe it's another driver issue, so I'll add my device and graphics driver to the issue. Have you tried different camera angles, it's not always visible...

[novemberist]

And yes, there is also one at the other end of the y-Axis

[ghost]

That's exactly the same issue I've had long ago... 🤔

[novemberist]

The color of the one on the top is affected by "Sky/Horizon Color" property and the one on the bottom by "Ground/Horizon Color" in the default environment settings by the way. Don't know if this helps to trace the source of this issue.

[BrainBlasted]

Could I get some of your project files? Also on Arch Linux, Godot master, Intel HD4000, Mesa 17.1.6, would like to see if I can reproduce.

Edit: I've rebuilt today, and yeah, I'm seeing this as well on old projects where it wasn't present before.

[novemberist]

I can no longer reproduce this.

[reduz]

This portal may be either
a) A floating point precision error in the panorama shader
https://github.com/godotengine/godot/blob/master/drivers/gles3/shaders/copy.glsl#L82
b) A floating point precision error or similar in the procedural sky code:
https://github.com/godotengine/godot/blob/master/scene/resources/sky_box.cpp#L131

[Zylann]

It still happens in Godot 3.2 beta2:

OpenGL ES 3.0 Renderer: GeForce GTX 1060 6GB/PCIe/SSE2, Windows 10 64 bits

[nathanfranke]

Still reproducible in 3.2.3.stable, re-open?

[akien-mga]

@nathanfranke #37192.