Dynamic infinite 3D grid

[aaronfranke]

Fixes #7245, EDIT: Also fixes #37561, needs testing and feedback. What this PR does:

• The grid is now infinite, it follows the camera.

• The grid is now dynamic, if you zoom in and out, the grid subdivides, expands, and fades.

• You can now enable grid planes for the XY and YZ planes. Only the flat XZ plane is enabled by default. Each plane is independently dynamic of the others.

• The default grid size has been increased to 200, and the maximum has been increased to 2000. At 1000, the grid mostly looks edgeless.

(slightly outdated) video demo: https://www.youtube.com/watch?v=k28f3QjaW6o

• If you set the division level max and min to the same value then the grid does not expand or subdivide, but instead stays the same size and just follows the camera. Also, if these values are the same, the bias value does nothing.

• If you want to have Blender-like behavior, set max to 1, min to 0, and set the bias to a really low value. You may also wish to increase the grid size if you have a small bias.

Also, a future enhancement idea, it would be nice if there was a way to fade the grid with distance. Right now I have an effect where the grid lines individually fade based on distance, but it is sub-par since lines that come near the camera are still fully opaque even when far away, and also there's no way to make the grid gradually fade, right now it only fades in steps when you zoom. #12324

[MarcusElg]

This feels like a quite important feature so how is it going?

[lentsius-bark]

Happened to pass by this and it indeed would be an awesome feature! Any news on it?

[MarcusElg]

Even blender 2.8 has it now :P

[MarcusElg]

@aaronfranke Any update? What's left?

[aaronfranke]

@MCrafterzz I took another look at it, and I think it's good now. Everything seems to work great.

[MarcusElg]

@MCrafterzz I took another look at it, and I think it's good now. Everything seems to work great.

Thanks, infinite grid is a really nice feature to have! Can someone review this then?

[Calinou]

I tested this PR locally, it looks great!

I wonder if we should make the default grid colors less opaque. Right now, it stands out quite a lot in a dark environment:

Here's with both grid colors having their opacity halved:

[aaronfranke]

@Calinou Good suggestions! It looks great with half opacity, and I don't know what I was thinking with the comments being on the end of such long lines.

EDIT: Oh, I made the changes and forgot to push them, whoops. They're pushed now...

[akien-mga]

Thanks!

[Calinou]

Would it be possible to make a PR with this feature for the 3.2 branch? Everything should be feasible there, except for the transparent grid part (unless we can figure out a way to make it work there).

3.2.2 is nearing release, but we could get this feature into 3.2.3.

[FyiurAmron]

@Calinou any news on when do this can possibly be released?

[Calinou]

@FyiurAmron This feature is already available in the master branch, but nobody has started work on remaking this for the 3.2 branch yet.

[yikescloud]

I think if we can see the grid when on orthogonal sideview will be useful!

[aaronfranke]

@firecloud888 You already can: