Better STEP: A Standardized B-Rep Dataset and Pipeline for Reproducible CAD Evaluation
ABS-HDF5
ABS-HDF5 reads B-Rep geometry from HDF5 files as a standard half-edge data structure, allowing you to navigate topology (faces, edges, halfedges, loops), sample points directly from continuous parametric surfaces and curves, and evaluate normals and derivatives. It supports user-specified tasks, and provides fast Poisson-disk downsampling for blue-noise point cloud generation.
HDF5 files are produced by steptohdf5, a companion converter that turns STEP/STP CAD files into the format ABS reads.
Install
pip install abs-hdf5
Usage
Reading and traversing topology
read_parts loads the full B-Rep structure into memory as linked Python objects.
from abs import read_parts
parts = read_parts('model.hdf5')
face = parts[0].faces[1]
adjacent_faces = face.find_adjacent_faces()
loop = face.loops[0]
Sampling points with user-defined labels
sample_parts generates points on parametric surfaces and curves and passes them to your callbacks. Each callback receives the topological entity and the sampled points, and returns whatever per-point values your task needs including labels, normals, primitive types, etc.
from abs import read_parts, sample_parts
import numpy as np
def face_func(face, points):
return np.zeros(points.shape[0])
def edge_func(edge, points):
return np.ones(points.shape[0])
parts = read_parts('model.hdf5')
face_points, face_labels, edge_points, edge_labels = sample_parts(
parts, num_samples=5000, face_func=face_func, edge_func=edge_func
)
Computing normals
Normals are evaluated directly from the underlying parametric surfaces.
def get_normals(face, points):
return face.normal(points)
face_points, face_normals, _, _ = sample_parts(
parts, num_samples=5000, face_func=get_normals
)
Extracting the mesh
The mesh is stored independently from the B-Rep topology. get_mesh concatenates all per-face triangulations into a single consistent mesh.
from abs.utils import read_meshes, get_mesh
meshes = read_meshes('model.hdf5')
V, F = get_mesh(meshes)
Examples
For a full set of worked examples, loading models, traversing topology, computing normals, primitive segmentation, and mesh extraction, see the abs/use_cases.ipynb notebook.
Dataset
The dataset comprises over one million B-Rep models converted from two large-scale public CAD collections:
- ABC — ~1,000,000 models
- Fusion 360 Gallery — Assembly (162,707 parts), Joint (23,029 parts), Reconstruction (27,958 parts), and Segmentation (35,680 parts)
Each model is stored in HDF5 as a collection of parts, where every part contains its geometry, topology, and an optional triangular mesh. Once converted, no CAD kernel is required to read or process the data.
The dataset can be downloaded here: [link coming soon]
Converting your own STEP files
To convert your own STEP files, please refer to the steptohdf5 repository.
Contributing
Contributions are welcome. Please open an issue before submitting larger changes.
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for abs-hdf5 1.0.0
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| Size | 4.2 MB |
| Tags | CPython 3.9 macOS 11.0+ ARM64 |
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