"ONE" constant for Vector3/Vector2

[ghost]

The only Vector3 constant that's missing compared to Unity is Vector3.ONE, which is shorthand for Vector3(1, 1, 1). It's something I didn't push for before #14704 was merged since I thought that PR was on pretty thin ice at the time, but now that it's in it would be nice to have it added once and for all.

The same could also be done for Vector2 (Vector2.ONE as a shorthand for Vector2(1, 1))

[aaronfranke]

Hmm...

[KellyThomas]

How do people feel about NEGONE now?

[akien-mga]

I don't see much use case for NEGONE (beyond the fact that it's a weird name that I wouldn't understand as Vector3(-1, -1, -1) instinctively), since you can simply use -Vector3.ONE.

[aaronfranke]

It's fine if you want to remove it. It's not critical though I do find it useful sometimes.

[KellyThomas]

OK, I won't add it to #22808 then.