Ouchi, K.Keyser, J.Gershon Elber and Nicholas Patrikalakis and Pere Brunet2016-02-172016-02-1720043-905673-55-X1811-7783https://doi.org/10.2312/sm.20041409We present a method for dealing with degenerate situations in an exact boundary evaluation system. We describe the possible degeneracies that can arise and how to detect them. We then present a numeric perturbation method that is simpler to implement within a complex system than symbolic perturbation methods.I.3.5 [Computer Graphics]Computational Geometry and Object Modeling G.4 [MATHEMATICAL SOFTWARE]Reliability and robustness10.2312/sm.20041409321-326