Varley, P. A. C.Takahashi, Y.Mitani, J.Suzuki, H.Joaquim Armando Pires Jorge and Eric Galin and John F. Hughes2014-01-272014-01-2720043-905673-16-91812-3503https://doi.org/10.2312/SBM/SBM04/117-126We describe a two-stage approach for interpreting line drawings of curved objects. In the first stage, the user enters a natu-ral line drawing of a polyhedral template; this is automatically interpreted as the corresponding polyhedral object. In the second stage, the user enters freehand curves; by relating these to the template, a curved object can be constructed