It is a tool like curvepiping, softedges, displacement.
It will offset a mesh with a given thickness not unlike offsetmesh.
The purpose is for visualization.
- note that my V6 is currently dysfunctional so I rely on what I found the last time I checked.
Correct, you can make an open object appear to have thickness at the edges and an ‘inside’ surface. Now, if only we could soften those edges…