58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
"""
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export a city into Obj format
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SPDX - License - Identifier: LGPL - 3.0 - or -later
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Copyright © 2022 Concordia CERC group
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Project Coder Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
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"""
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from pathlib import Path
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class Obj:
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"""
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Export to obj format
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"""
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def __init__(self, city, path):
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self._city = city
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self._path = path
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self._export()
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def _to_vertex(self, coordinate):
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x = coordinate[0] - self._city.lower_corner[0]
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y = coordinate[1] - self._city.lower_corner[1]
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z = coordinate[2] - self._city.lower_corner[2]
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return f'v {x} {y} {z}\n'
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def _export(self):
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if self._city.name is None:
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self._city.name = 'unknown_city'
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file_name = self._city.name + '.obj'
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file_path = (Path(self._path).resolve() / file_name).resolve()
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vertices = {}
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with open(file_path, 'w', encoding='utf-8') as obj:
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obj.write("# cerc-hub export\n")
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vertex_index = 0
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faces = []
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for building in self._city.buildings:
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obj.write(f'# building {building.name}\n')
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obj.write(f'g {building.name}\n')
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obj.write('s off\n')
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for surface in building.surfaces:
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obj.write(f'# surface {surface.name}\n')
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face = 'f '
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for coordinate in surface.perimeter_polygon.coordinates:
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vertex = self._to_vertex(coordinate)
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if vertex not in vertices:
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vertex_index += 1
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vertices[vertex] = vertex_index
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current = vertex_index
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obj.write(vertex)
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else:
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current = vertices[vertex]
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face = f'{face} {current}'
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faces.append(f'{face} {face.split(" ")[1]}\n')
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obj.writelines(faces)
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faces = []
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