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64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
"""Backend access for parametric_cad.
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This module centralizes interaction with the mesh backend so other
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parts of the package do not need to import the backend directly.
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Currently :mod:`trimesh` provides all geometry functionality, but this
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wrapper allows the backend to be swapped or mocked easily.
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"""
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import trimesh as _trimesh
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from typing import Iterable, Any
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def safe_difference(mesh, other, *, engine="scad"):
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"""Perform a boolean difference with graceful fallback.
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Parameters
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----------
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mesh : _trimesh.Trimesh
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Base mesh to subtract from.
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other : _trimesh.Trimesh or list
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Mesh or list of meshes to subtract.
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engine : str or None, optional
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Preferred boolean engine. ``"scad"`` is tried by default.
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Returns
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-------
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_trimesh.Trimesh
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Resulting mesh if the operation succeeds, otherwise the original
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``mesh`` if all boolean attempts fail.
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"""
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try:
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if engine:
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return mesh.difference(other, engine=engine)
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return mesh.difference(other)
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except Exception:
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try:
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return mesh.difference(other)
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except Exception:
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return mesh
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# Public alias so that other modules can use the backend without
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# importing ``trimesh`` themselves.
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tm = _trimesh
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def combine(objects: Iterable[Any]) -> _trimesh.Trimesh:
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"""Return a union of ``objects``.
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Each object may be a :class:`~trimesh.Trimesh` or have a ``mesh``
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method returning one.
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"""
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meshes = []
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for obj in objects:
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if isinstance(obj, _trimesh.Trimesh):
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meshes.append(obj)
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elif hasattr(obj, "mesh"):
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m = obj.mesh
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meshes.append(m() if callable(m) else m)
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else:
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raise TypeError(f"Object {obj!r} cannot be converted to a mesh")
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return _trimesh.util.concatenate(meshes)
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__all__ = ["tm", "safe_difference", "combine"]
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