When I updated to 5.5 I started to get softbodies falling through my meshes at certain triangles (not a bullet through paper issue). I've attached an example mesh where softbodies will consistently fall through one triangle for no reason I can see (rigidbodies collide with it properly and the triangle is rendered one-sided correctly).
Repro:
https://matthewsouth.s3-eu-west-1.amazon...Mesh.asset
1. Add the attached mesh to the Ballpool sample.
2. Add a mesh collider and obi collider to the mesh game object.
3. Drop a softbody (eg the ball from the samples) onto the triangle highlighted below.
4. The ball should fall through.
![[Image: BallFallsThrough.png]](https://www.matthewsouth.info/wp-content/uploads/2020/09/BallFallsThrough.png)
Notes:
1. The softbody doesn't fall through other triangles in this mesh.
2. The softbody will always fall through the triangle 100%.
3. Rigidbodies correctly collide with this triangle.
4. This only started happening in 5.5 as far as I know.
5. Optimising the meshes did seem to help a bit, but not in cases like this.
I fully expect this will be some issue with my mesh but I'm just not sure what so any help or advice would be much appreciated!
Repro:
https://matthewsouth.s3-eu-west-1.amazon...Mesh.asset
1. Add the attached mesh to the Ballpool sample.
2. Add a mesh collider and obi collider to the mesh game object.
3. Drop a softbody (eg the ball from the samples) onto the triangle highlighted below.
4. The ball should fall through.
Notes:
1. The softbody doesn't fall through other triangles in this mesh.
2. The softbody will always fall through the triangle 100%.
3. Rigidbodies correctly collide with this triangle.
4. This only started happening in 5.5 as far as I know.
5. Optimising the meshes did seem to help a bit, but not in cases like this.
I fully expect this will be some issue with my mesh but I'm just not sure what so any help or advice would be much appreciated!