STEP Inspector

STEP Inspector is a lightweight CAD data exploration tool for STEP (*.stp, *.step) files. The goal of this project is to understand how CAD geometry and topology are represented inside STEP files and to gradually build a bridge between STEP entities and a custom geometry kernel.

Current features:

• Open STEP files
• Entity counting
• Entity hierarchy browser
• Entity reference viewer
• Raw STEP entity inspection
• CARTESIAN_POINT parsing

Example:

STEP FILE "Ravioli"
 ├── CARTESIAN_POINT
 │    ├── #1245=CARTESIAN_POINT('',(0.,0.,0.));
 │    ├── #1246=CARTESIAN_POINT('',(-20.,-16.,0.));
 │    └── ...
 ├── VERTEX_POINT
 │    ├── #545=VERTEX_POINT('',#1247);
 │    │      └── #1247=CARTESIAN_POINT('',(-20.,-14.,0.));
 │    ├── #546=VERTEX_POINT('',#1248);
 │    │      └── #1248=CARTESIAN_POINT('',(-20.,-18.,0.));
 │    └── ...
 ├── EDGE_CURVE
 │    ├── #627=EDGE_CURVE('',#545,#546,#748,.T.);
 │    │       ├── #545=VERTEX_POINT('',#1247);
 │    │       ├── #546=VERTEX_POINT('',#1248);
 │    │       └── #748=CIRCLE('',#830,2.);
 │    └── ...
 ├── ADVANCED_FACE
 │    ├── #52=ADVANCED_FACE('',(#136),#96,.T.);
 │    │       ├── #136=FACE_OUTER_BOUND('',#179,.T.);
 │    │       └── #96=CYLINDRICAL_SURFACE('',#832,2.);
 │    └── ...
 ├── MANIFOLD_SOLID_BREP
 │    ├── #45=MANIFOLD_SOLID_BREP('',#47);
 │    │       └── #47=CLOSED_SHELL('',(#52,#53,#54,#55,#56,#57,#58,#59,#60,#61,#62,#63,#64));
 │    └── ...
 └── ...

UI:

Supported Entity Types:

• You can add or remove entity types in the file: @Schemas/Custom.txt
• Lists of available entities for AP203, AP214, and AP242 will be available soon.

Currently Listed Entity Types (Default):

CARTESIAN_POINT
VERTEX_POINT
EDGE_CURVE
EDGE_LOOP
ADVANCED_FACE
MANIFOLD_SOLID_BREP
LINE
VECTOR
CIRCLE
ELLIPSE
CURVE
PLANE
CLOSED_SHELL
FACE_BOUND
FACE_OUTER_BOUND
ORIENTED_EDGE
AXIS2_PLACEMENT_3D
B_SPLINE_CURVE
B_SPLINE_CURVE_WITH_KNOTS
B_SPLINE_SURFACE
B_SPLINE_SURFACE_WITH_KNOTS
RATIONAL_B_SPLINE_SURFACE
CYLINDRICAL_SURFACE
CONICAL_SURFACE
TOROIDAL_SURFACE

🚧 Work in Progress 🚧

Planned features:

• Vertex / Edge / Face construction
• B-Rep graph visualization
• STEP geometry explorer
• Wireframe viewer