deform mesh at collision

Hello there,

Question about deforming here.
I build up a street with bricks (rigid body’s)
to keep them in position I placed a plane with rigid body (passive)
I used a sphere to ram into the bricks.
To make it realistic and show some deformation underneath the street. I have to make the plane to reacte on the sphere. only the part were the sphere hits. it needs to bends down. (vertex level)
I have a way to solve it with the cast modifier. (vertex group and then keyframing use transform on the moment the sphere impacts the street.)

I can use softbody on the plane. This defroms the mesh. and let it stop on a certain keyframe.
I discovered that this is not working great when I import this to otherfiles, Also it I have 2 opbjects that deform this plane mesh! this seems to give trouble and it looks like there is some conflict between them.
1 stops reacting with the mesh for no reason when I setup this agian the other stops reacting?
Do I mis Something there?

Thanks

Maybe by removing them and adding them, they don’t belong to same rigid body world group.
Maybe you moved one to another layer and they are no more on same collision layer.