API ReferenceModelingAlgorithmsTKHelixTKHelix7 classes across 2 packages.Copy MarkdownOpenHelixBRep1classHelixGeom6classesTopTransOCCT package TopTrans: TopTrans_CurveTransition, TopTrans_SurfaceTransition.HelixBRepOCCT package HelixBRep: HelixBRep_BuilderHelix.