Rounded surfaces will often have some portion of the surface normal to the Radar source.

Aglarel waved his hand over the scene, and the table returned to its normal brown surface.

Instead only the surface normal is modified as if the surface had been displaced.

The surface normal is directed usually by the right-hand rule.

Often the displacement direction is also limited to the surface normal at the vertex.

The concept of normal surface can be generalized to arbitrary polyhedra.

There is also a related notion of almost normal surface.

Integrals of vector fields are more complicated, because the surface normal is involved.

This displacement is usually not limited to the local surface normal but can be given an arbitrary direction.

The road will need a thicker than normal surface and a solid concrete base.