mesh colliders won't collide

I’ve put a cube hovering above a plane. Both with mesh colliders but the cube falls right through the plane. What gives?

attach rigidbodies

You’re using mesh colliders for a cube and a plane? You should be using box colliders, and also mesh colliders can’t collide unless they’re set to convex in the collider properties.

@ Waltermana
I’ve got rigids attached to both but can’t find an option to turn on that stops the box from falling through the plane.

@BlobVanDam

The reason for the mesh collider is because I’m trying to alter the buoyancy script for Nikko’s Ocean v3. I just didn’t bother to change it because I assumed there’d be no difference and eventually I’ll be using a mesh collider for the boat. Does it make a difference? If so I’ll change it.

You should be using box colliders, and also mesh colliders can’t collide unless they’re set to convex in the collider properties.

I set them to convex but get the same thing.

The problem is w/ the Ocean v3. Everything works fine until I add it. Then things start to go haywire.