3D gizmos are rendered behind the grid

[Flavelius]

Godot version:

3.2.4.beta6.mono.official

OS/device including version:

win10, nvidia gtx1060

Issue description:

Editor scene gizmos are rendered behind the world grid:

[akien-mga]

To be clear, you're talking about the directional light gizmo specifically here?
The other two gizmos (transform and cube) don't seem to be behind the grid.

[Flavelius]

All of the 'gizmos' are behind the grid, the transform handle is not.

[aaronfranke]

I tested some old Godot versions. This bug occurs on all 3.x releases (I tested down to 3.0.6) but does not occur on 2.1.6.

[JFonS]

This happens because of the transparent object sorting, there's no easy way to split the grid so that sorting doesn't cause issues AFAIK.

After #28289 (or #43206 for 3.2) the issue has become more apparent due to the grid being denser, especially at very steep viewing angles like in OP's image.

I have a WIP branch adding a shader to the grid, so it fades nicely at steep angles. I will try to clean it up and open a PR soon.

[Flavelius]

Can't the grid then just be rendered as solid lines; does it need transparency?
(fading it out at steep angles is also nice, as i also find the pop-in effect somewhat distracting)

[Calinou]

Can't the grid then just be rendered as solid lines; does it need transparency?

Yes, the grid needs transparency to look more subtle especially since it's infinite. Otherwise, it easily gets too obnoxious.

[nathanfranke]

See https://docs.godotengine.org/en/stable/tutorials/3d/3d_rendering_limitations.html#transparency-sorting and #23694

[JFonS]

I opened #45594, which should mitigate this issue.

[Flavelius]

With the new fading-out grid, this is less noticeable