Generate Domain Surfaces

When this command is clicked on, the program analyses existing boundary curves and attempts to generate planar surfaces automatically, i.e., without the user being required to define its boundaries. This operation is usually successful when there is a single uninterrupted boundary curve. The operation may fail when there are some ambiguities, such as when there are multiple curves or when boundary curves are not closed. If this operation fails, the following warning is displayed.

and the user needs to define Surface manually.