Unrolling a complex surface, such as a ship hull or a 15" Dahlgren gun barrel usually takes the shape of unrolling segments and then stitching them back together. By default, Rhino plops the unrolled surfaces down at the grid origin. How the pars come to lie depends on the surface direction. Now, I don't know about you, but I don't commonly keep track of that. With a bunch of similar-looking surfaces lying around I have a hard time sorting out what goes where.
Here I'm taking advantage of the fact that annotation dots placed on a 3D surface get unrolled with that surface (as long as you include it in your selection) So a dot labelled "frontRight" or "outside" will indicate the front-right edge of the surface in question.
Presto!
