75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
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import numpy as np
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import stl
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from helpers.geometry import Geometry
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class Polyhedron:
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def __init__(self, surfaces):
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self._surfaces = [s for s in surfaces]
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self._polygons = [s.polygon for s in surfaces]
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self._polyhedron = None
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self._volume = None
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self._faces = None
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self._vertices = None
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self._mesh = None
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self._geometry = Geometry()
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def _position_of(self, point):
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vertices = self.vertices
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for i in range(len(vertices)):
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if self._geometry.almost_equal(vertices[i], point):
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return i
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return -1
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@property
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def vertices(self):
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if self._vertices is None:
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vertices, self._vertices = [], []
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[vertices.extend(s.points) for s in self._surfaces]
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for v1 in vertices:
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found = False
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for v2 in self._vertices:
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found = False
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if self._geometry.almost_equal(v1, v2):
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found = True
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break
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if not found:
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self._vertices.append(v1)
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self._vertices = np.asarray(self._vertices)
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return self._vertices
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@property
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def faces(self):
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if self._faces is None:
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self._faces = []
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for s in self._surfaces:
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face = []
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points = s.points
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for p in points:
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face.append(self._position_of(p))
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self._faces.append(face)
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self._faces = np.asarray(self._faces)
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return self._faces
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@property
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def _polyhedron_mesh(self):
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if self._mesh is None:
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self._mesh = stl.mesh.Mesh(np.zeros(self.faces.shape[0], dtype=stl.mesh.Mesh.dtype))
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for i, f in enumerate(self.faces):
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for j in range(3):
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self._mesh.vectors[i][j] = self.vertices[f[j], :]
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return self._mesh
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@property
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def volume(self):
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if self._volume is None:
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self._volume, cog, inertia = self._polyhedron_mesh.get_mass_properties()
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return self._volume
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@property
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def max_z(self):
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return self._polyhedron_mesh.z.max()
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def save(self, full_path):
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self._polyhedron_mesh.save(full_path)
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