Composite Collider doesn't work with polygon collider which has scale.x = -1

Unity Engine
,
1

There are two colliders which are polygon colliders:
6140091--670014--upload_2020-7-28_12-18-33.png

And I have a composite collider which works:
6140091--670020--upload_2020-7-28_12-20-12.png

But it goes wrong when I set the polygon collider’s scale.x to -1 for flipping the object.
6140091--670023--upload_2020-7-28_12-23-18.png

And it is a terrible issue when I used the polygons geometry type. The paths are wrong, so there are lots of holes that are not intended.

For instance, there are two polygon colliders: one is another flipped.

It seems to be because the order of the polygon collider points is reversed.
Unity 2019.4.3f1

6140091–670041–Project.zip (60.2 KB)

2

That’s very strange.It shouldn’t be vertex-winding order dependant.

Would you mind submitting your project as a bug report and sending me the case number? That way you can track a fix.

3

[[quote=“MelvMay, post:2, topic: 802070, username:MelvMay”]
That’s very strange.It shouldn’t be vertex-winding order dependant.

Would you mind submitting your project as a bug report and sending me the case number? That way you can track a fix.
[/quote]
Submitted.
Case number: 1266460
](https://fogbugz.unity3d.com/default.asp?1266460_29gq18pimvbro373)

1 Like
4

Thanks. I’ve assigned the case to me and can reproduce the issue. Now to find out why the winding is going wrong and fix it.

2 Likes