Thanks all for input and comments and Pilou the Vizcom image regen is pretty impressive from the black and white render AI certainly moving along. The above workflow works well for a reconstructing a 2d spline into a series of tangency arcs trying to do the same workflow for a 3d curve - does anyone know if its possible for the cont/arc tool to follow a 3d guide curve as in this image I can get it follow only in 1 viewport. any advice once again welcome.