STEP

Table of Contents

• Overview
• Mapping
  • Import Mapping
  • Product Structure
  • Topology
  • Geometry

Overview

ModelData.ModelReader can read STEP AP203, AP214 or AP242 files.

Scope

Import
B-Rep representations assembly structure PMI

Mapping

Import Mapping

Below tables shows how STEP entities are mapped into MTK entities after import.

Product Structure

STEP Entity	MTK Entity
product_definition	One of: ModelData.Assembly ModelData.Part
next_assembly_usage_occurrence	ModelData.Instance
item_defined_transformation	Geom.Transformation

Topology

STEP Entity	MTK Entity
manifold_solid_brep	ModelData.SolidBody
brep_with_voids
shell_based_surface_model	ModelData.SheetBody
face_based_surface_model
edge_based_wireframe_model	ModelData.WireframeBody
geometric_curve_set
closed_shell	ModelData.Shell
oriented_closed_shell
open_shell
advanced_face	ModelData.Face
face_surface
curve_bounded_surface
face_bound	ModelData.Wire
face_outer_bound
edge_loop
connected_edge_set
composite_curve
boundary_curve
outer_boundary_curve
edge_curve	ModelData.Edge
oriented_edge
vertex_point	ModelData.Vertex

Geometry

STEP Entity	MTK Entity
Surfaces
b_spline_surface_with_knots	Geom.BSplineSurface
rational_b_spline_surface
uniform_curve
quasi_uniform_curve
conical_surface	Geom.ConicalSurface
cylindrical_surface	Geom.CylindricalSurface
offset_surface	Geom.OffsetSurface
plane	Geom.Plane
rectangular_trimmed_surface	Geom.Surface
spherical_surface	Geom.SphericalSurface
surface_of_linear_extrusion	Geom.SurfaceOfLinearExtrusion
surface_of_revolution	Geom.SurfaceOfRevolution
toroidal_surface	Geom.ToroidalSurface
Curves
b_spline_curve_with_knots	Geom.BSplineCurve Geom.BSplineCurve2d
rational_b_spline_curve
uniform_curve
quasi_uniform_curve
circle	Geom.Circle Geom.Circle2d
ellipse	Geom.Ellipse Geom.Ellipse2d
hyperbola	Geom.Hyperbola Geom.Hyperbola2d
line	Geom.Line Geom.Line2d
offset_curve	Geom.OffsetCurve Geom.OffsetCurve2d
parabola	Geom.Parabola Geom.Parabola2d
trimmed_curve	Geom.Curve