ball is passing through Interactive cloth

cloth does not have a collider it has force interation. if you want a collider you can try this.

I do not know if this nonCPU intensive or not but it works. Make a separate game object with a mesh collider as child at (0,0,0) position relative to the cloth. put in in a lyer that does collide with the cloth. This gives a mesh collider that follows the cloth.

put this on the object

 public InteractiveCloth cloth;
 public Mesh mesh;


 void Start () {
     mesh = (Mesh)Instantiate(cloth.mesh);
     GetComponent<MeshCollider>().sharedMesh = mesh;
 }

 void Update () {

     calcFreqCount = calcFreq;
     GetComponent<MeshCollider>().sharedMesh = null;
     mesh.vertices = cloth.vertices;
     GetComponent<MeshCollider>().sharedMesh = mesh;

}

from what i've noticed, interactive cloth's collider is made of cylinders around the mesh. it does not appear to have faces in its collider, meaning the cloth acts sort of like a net. if an object is too small, it will simply pass through this net without touching it. i would suggest increasing the number of verts (lines) in your net model.