Surface [SIG]

Two types of surfaces can be defined for use in load definitions:

Quadrilateral: Surfaces with four sides can be defined, allowing users to input specific parameters such as start and end stations, transverse offsets, and width.

Arbitrary Polygon: Surfaces with irregular shapes can also be defined, enabling users to specify points for the desired surface geometry.

Refer to the following sections in the documentation for further explanation of each type.