| # STEP face and edge labels
|
|
|
| Use pythonocc-core **7.8.1.1** with OCCT **7.8.1** and the supplied `read_labels.py`.
|
|
|
| ## Traversal
|
|
|
| ```python
|
| from OCC.Extend.DataExchange import read_step_file
|
| from OCC.Extend.TopologyUtils import TopologyExplorer
|
|
|
| shape = read_step_file("model.step", as_compound=True, verbosity=False)
|
| topology = TopologyExplorer(shape, ignore_orientation=True)
|
| faces = list(topology.faces())
|
| edges = list(topology.edges())
|
| ```
|
|
|
| `face_labels[i]` labels `faces[i]`; `edge_labels[j]` labels `edges[j]`.
|
| Both arrays contain binary integers and use zero-based indices. They cover
|
| every face and edge returned by these traversals, including boundary and seam
|
| edges. The same underlying primitive encountered with different orientations
|
| is counted once (`IsSame` comparison).
|
|
|
| Use the compound returned by `read_step_file`, retaining all transferred
|
| shapes. Read the provided STEP without normalization, healing, simplification,
|
| or re-export, and preserve traversal order. The indices are traversal positions,
|
| not STEP entity numbers. Different OCC versions or traversal implementations
|
| can change the association.
|
|
|
| ## Label files
|
|
|
| `labels/<state-id>.json` contains:
|
|
|
| | Field | Meaning |
|
| |---|---|
|
| | `query` | List of text queries sharing the target primitives |
|
| | `face_labels` | One binary value per traversed face |
|
| | `edge_labels` | One binary value per traversed edge |
|
|
|
| `read_step_labels(step_path, labels_path)` returns the original OCC shape,
|
| ordered `faces` and `edges`, and the labels. It checks the primitive counts
|
| against the label lengths and validates binary values.
|
|
|
| Construct any network-specific representation after reading this association,
|
| carrying the labels through the corresponding primitive mapping.
|
|
|
