I used a shatter tool on a poly extruded grid, it gives me a unwanted surface along the cut. When I set ‘creat inside surface ’ off , that unwanted surface disappears but then the shattered pieces remain opened. When I disable the poly extrude sop it works fine (see sphere object1 network).
Can someone please explain?
Thanks

Is it related to surface normals? They are pointing inside after polygon extrusion. So I reversed the direction of extrusion but still it didn't take care of the entire unwanted surface. How can I change the direction of surface normals like what we can do with point normals?

It seems that I got the solution. I used primitive sop after poly extrude and befor shatter sop. In it's Face/ Hull option go to vertex and set it to ‘Reverse’ and the unwanted surface I was talking about, disappears!!
But didnt understand how it solved the problem? . (This is changing the surface normals direction)

can someone please explain this to me

Thanks