Mesh Collider Breaking on build

Everything was working wonderfully until my last build when all the buildings in my scene stopped colliding and now I can walk through them all though other items in the world seem unaffected and they have the same settings, only my buildings wierdly though they were one of the first things added to my scene(low poly).

This is only happening in my build and it still all works great in the editor

any ideas of where Ive went wrong? Only thing I can think of is I added a load of trees with box colliders(terrain tool) is their an upper limit that I could of passed or is it something else?

I know I had to change my box colliders from discreet to get them working correctly in build but I don't get that option with the mesh colliders.

I have just removed them and added them again and it seems to have fixed the problem for now but any ideas on what ive done wrong or what has caused the problem for when it happens next time? I am just using the collider with the default settings.

 

It seems that upgrading to 2019.3 they added a new cooking option. If you previously had a mesh collider with default cooking options, after upgrading it will no longer be default. It looks like you either have to reset it to default, or enable read/write options in the mesh.

 

hi I have same issue ....but i am procedural generating the mesh... And mesh collider is also procedural generated...Please some help here ....for that what should i do ??

 

Hi, upgraded to 2022.2 ... game has been stable since 2018 now colliders all stopped working, all surfaces and characters. No collisions get detected or trigger.
Super frustrating.
Resetting does not seem to work, where is the read / write setting please? Can't find.
Not good QA.

 

Read/write checkbox is found in the model tab of the mesh import settings. Select your mesh in the project, and you'll find them in the inspector.

See the manual:
https://docs.unity3d.com/Manual/FBXImporter-Model.html
https://docs.unity3d.com/ScriptReference/Mesh-isReadable.html

 

Allow Unity to keep you mesh data on the CPU, for it to be used in the physics engine. You do this by setting the mesh's isReadable property to true:
https://docs.unity3d.com/ScriptReference/Mesh-isReadable.html

Otherwise, Unity will delete the CPU copy of the mesh once it's uploaded to the GPU for rendering.