“…The second approach, implicit surface representation, uses isovalues of one or several scalar fields in 3D space to represent the geometry of geological surfaces (e.g. stratigraphic horizons and fault surfaces) (Jessell, 1981;Calcagno et al, 2008;Caumon et al, 2013;Cowan et al, 2003;Frank et al, 2007;Hillier et al, 2014;Lajaunie et al, 1997;Mallet, 2002Mallet, , 2014Maxelon et al, 2009;Moyen et al, 2004;Yang et al, 2019;Renaudeau et al, 2019;Manchuk and Deutsch, 2019;Gonçalves et al, 2017;De La Varga et al, 2019). The value of the scalar field represents the distance away from a reference horizon.…”