In Blender’s Freestyle, a line set filters which edges are drawn using criteria like visibility, face marks

https://judahiwcb733.quantlynix.com/posts/what-to-know-before-upgrading-an-older-ac-line-set

In Blender’s Freestyle, a line set filters which edges are drawn using criteria like visibility, face marks, and material boundaries, allowing separate stroke styles for silhouettes and creases.