The bookkeeping that manages the correspondence between locations on the intrinsic mesh and on the surface mesh is implemented either using integer-based "Normal Coordinates" ( cf 'Integer Coordinates for Intrinsic Geometry Processing' M. Gillespie, N. Sharp, and K. Crane, TOG , Vol. 40, December 2021. ) as used by FIntrinsicEdgeFlipMesh and FIntrinsicMesh; or alternately floating-point based generalized directions "Signpost data" ( cf 'Signpost Coordinates inspired by "Navigating Intrinsic Triangulations' Sharp, Soliman and Crane [2019, ACM Transactions on Graphics]) as used by FIntrinsicTriangulation. The FSimpleIntrinsicEdgeFlipMesh is designed to work with the function FlipToDelaunay() to make an Intrinsic Delaunay Triangulation (IDT) of the same surface as a given FDynamicMesh, allowing for more robust cotangent-Laplacians (see LaplacianMatrixAssembly.h)