Can I invert positive interface/ add a negative interface in staged construction step ?

Question

In staged construction, I could see the positive interface has got inverted. In the image you can see the positive interface for the red highlighted polygon is vertically down whereas in the structures mode it looked like as if it is vertically up (as you can see in teh image other interfaces are vertically up). Can I create the interface at the vertically up (as you can see other interfaces)?

Stefanos Papavasileiou · Accepted Answer

Hello again, 
 In PLAXIS a positive or negative interface is added depending on the normal of the surface. By defining a surface the local axes can be viewed under the Options menu. 
 Therefore, based on where that normal is pointing you can select to create a positive or negative interface.

Stefanos Papavasileiou · Answer

Dear Piyush, 
 This probably happened as there are multiple surfaces defined at that location and due to intersection, it has to choose up or down due to the conflict. You must have received a warning about it when switched from Structures to Mesh mode. 
 As you cannot perform geometric changes in staged constructions you have two options: 
 - check the overlapping surfaces in Structures mode and manually intersect them to generate one surface per case for which you can assign the relevant interface - use the RMB in Structures mode to "Invert normal" of the surface to which this interface belongs, as that should make sure you have the same local axes with the overlapping surface and generating the correct interface should work.

Stefanos Papavasileiou · Answer

Dear Piyush, 
 Any changes to the geometry require re-meshing. In staged construction, you need to make sure that the correct surface and interface is activated. The rest of the objects should be according to what you had already before.

Stefanos Papavasileiou · Answer

Dear Piyush, 
 Changing the normal of a surface means that you will generate a different interface (positive or negative). This requires re-meshing. 
 You can see that as we place an asterisk in the modes that require attention and the Mesh is one of them.

Can I invert positive interface/ add a negative interface in staged construction step ?

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