Question:

What is the difference between a break line and a soft break line?

Answer:

Break Lines are used to designate linear features such as edges of pavement, ditch bottoms, ridges, etc. where an abrupt change of slope occurs. Any longitudinal element may be defined as a break line. Triangles will not cross a break line in the terrain model.

A Soft Break Line is a break line, however, if it crosses a regular break line, it will not affect the triangulation and is ignored.