I've seen someone shape a piece of wood with a draw knife by marking the wood in places with a pencil, then drawing the knife over the area until the mark was gone. Then repeating. He seemed to be doing this with relatively high accuracy results with respect to shape. He was also using a piece of paper and other measuring tools to monitor his outcome.
I have attempted to find youtube videos of this, but haven't found any that do this particular thing.
What is the draw knife technique with pencil marks called?
(I believe he was making scale model boat spars)