This template is for bug reporting. For general questions about the simulator, please create a new discussion at https://forum.devsim.org

Describe the bug

Reported in PR #157 by @marc-flex

Interfaces have surface normal vectors, but contacts do not.

NSurfaceNormal_x
NSurfaceNormal_y
NSurfaceNormal_z (3D)

To Reproduce

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context

There was a decision a long time ago to separate out the surface area at boundaries into:

• ContactSurfaceArea (Contacts)
• SurfaceArea (Interfaces)

At the time the surface normal was not saved for contacts. It is used for to find the interface normals in conjunction with the devsim.interface_normal_model command to find the distance and direction with respect to the nearest interface.

@marc-flex, how would you feel about creating these models instead:

ContactNSurfaceNormal_x
ContactNSurfaceNormal_y
ContactNSurfaceNormal_z (3D)

instead of lumping them into the models for the interface?