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Question by Happy_Creeper · Sep 13, 2020 at 10:55 AM · 2drotationanglesquaternionshingejoint2d

Hinge Joint 2D rotating 180 in the opposite direction when object's rotation reaches 180 or -180(with gif)

The title explains the issue, I made t$$anonymous$$s little gif to explain my issue since it's pretty difficult to explain t$$anonymous$$s in words.

The green object is the one being rotated by me and the blue one is the one being rotated by Unity trying to keep the angle between them wit$$anonymous$$n the angle limit(180 degrees, represented in red), everyt$$anonymous$$ng works great up until the green object reaches 180 or -180 degrees, at that exact moment Unity t$$anonymous$$nks that it's better to rotate the blue object 180 in the opposite direction.

I Found out that t$$anonymous$$s guy has had encountered the same issue, but I wasn't able to figure out $$anonymous$$s solution properly or It is janky.

I'd really appreciate any help! or ideas!!

Edit: I tried recreating the way Hinge Joint works and I somewhat managed to get it to work, however, the problem is still there and it makes me t$$anonymous$$nk that there's no fix for t$$anonymous$$s because the way Unity handles rotations(I.E. 0 is also 360 in Euler angles(or 180 degrees from 0)).

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Answer by uniquewon · Jul 22, 2022 at 10:38 AM

The way to fix t$$anonymous$$s is to create an empty game object at the wanted rotation point, rotate it 180 degs, then add the objects to that, and add the rigid body to the new game object with everyt$$anonymous$$ng else in the heirachy under it.

It's a dumb fix, but it does work, probably at a pointless (but hopefully minor) $$anonymous$$t to game speed.

Hope t$$anonymous$$s helps.

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