Gravity Sketch supports both NURBS Spline data and Mesh polygon data. Picture on the left shows how Gravity Sketch geometry will be exported in different file formats.
OBJ, FBX (Mesh)
FBX and IGES export are available for Pro/Studio users. IGES doesn’t contain Mesh data: Volume, Primitives, and OBJ models in the sketch won’t be exported to IGES. IGES exported from Gravity Sketch also keeps original reference curve data such as Revolve axis.