209 lines
6.6 KiB
Python
209 lines
6.6 KiB
Python
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from ..basemodel import TextModelParser, Exporter, Vertex, TexCoord, Normal, FaceVertex, Face
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from ..mesh import Material, MeshPart
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from functools import reduce
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import os.path
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import sys
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def is_obj(filename):
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"""Checks that the file is a .obj file
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Only checks the extension of the file
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:param filename: path to the file
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"""
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return filename[-4:] == '.obj'
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class OBJParser(TextModelParser):
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"""Parser that parses a .obj file
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"""
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def __init__(self, up_conversion = None):
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super().__init__(up_conversion)
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self.current_material = None
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self.mtl = None
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self.vertex_offset = 0
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def parse_line(self, string):
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"""Parses a line of .obj file
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:param string: the line to parse
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"""
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if string == '':
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return
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split = string.split()
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first = split[0]
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split = split[1:]
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if first == 'usemtl' and self.mtl is not None:
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self.current_material = self.mtl[split[0]]
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elif first == 'mtllib':
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path = os.path.join(os.path.dirname(self.path), ' '.join(split[:]))
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if os.path.isfile(path):
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self.mtl = MTLParser(self)
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self.mtl.parse_file(path)
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else:
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print('Warning : ' + path + ' not found ', file=sys.stderr)
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elif first == 'v':
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self.add_vertex(Vertex().from_array(split))
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elif first == 'vn':
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self.add_normal(Normal().from_array(split))
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elif first == 'vt':
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self.add_tex_coord(TexCoord().from_array(split))
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elif first == 'f':
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splits = list(map(lambda x: x.split('/'), split))
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for i in range(len(splits)):
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for j in range(len(splits[i])):
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if splits[i][j] != '':
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splits[i][j] = int(splits[i][j])
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if splits[i][j] > 0:
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splits[i][j] -= 1
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else:
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splits[i][j] = len(self.vertices) + splits[i][j]
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# if Face3
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if len(split) == 3:
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face = Face().from_array(splits)
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face.material = self.current_material
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self.add_face(face)
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# Face4 are well supported with the next stuff
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# elif len(split) == 4:
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# face = Face().from_array(splits[:3])
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# face.material = self.current_material
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# self.add_face(face)
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# face = Face().from_array([splits[0], splits[2], splits[3]])
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# face.material = self.current_material
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# self.add_face(face)
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else:
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# Bweeee
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# First, lets compute all the FaceVertex for each vertex
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face_vertices = []
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for face_vertex in splits[:]:
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face_vertices.append(FaceVertex(*face_vertex))
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# Then, we build the faces 0 i i+1 for each 1 <= i < len - 1
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for i in range(1, len(face_vertices) - 1):
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# Create face with barycenter, i and i + 1
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face = Face(face_vertices[0], face_vertices[i], face_vertices[i+1])
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face.material = self.current_material
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self.add_face(face)
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class MTLParser:
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"""Parser that parses a .mtl material file
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"""
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def __init__(self, parent):
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"""Creates a MTLParser bound to the OBJParser
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:param parent: the OBJParser this MTLParser refers to
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"""
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self.parent = parent
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self.current_mtl = None
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def parse_line(self, string):
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"""Parses a line of .mtl file
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:param string: line to parse
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"""
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if string == '':
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return
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split = string.split()
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first = split[0]
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split = split[1:]
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if first == 'newmtl':
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self.current_mtl = Material(' '.join(split[:]))
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self.parent.materials.append(self.current_mtl)
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elif first == 'Ka':
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self.current_mtl.Ka = Vertex().from_array(split)
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elif first == 'Kd':
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self.current_mtl.Kd = Vertex().from_array(split)
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elif first == 'Ks':
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self.current_mtl.Ks = Vertex().from_array(split)
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elif first == 'map_Kd':
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self.current_mtl.relative_path_to_texture = ' '.join(split)
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self.current_mtl.absolute_path_to_texture = os.path.join(os.path.dirname(self.parent.path), ' '.join(split))
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def parse_file(self, path):
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with open(path) as f:
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for line in f.readlines():
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line = line.rstrip()
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self.parse_line(line)
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def __getitem__(self, key):
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for material in self.parent.materials:
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if material.name == key:
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return material
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class OBJExporter(Exporter):
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"""Exporter to .obj format
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"""
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def __init__(self, model):
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"""Creates an exporter from the model
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:param model: Model to export
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"""
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super().__init__(model)
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def __str__(self):
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"""Exports the model
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"""
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current_material = ''
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string = ""
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for vertex in self.model.vertices:
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string += "v " + ' '.join([str(vertex.x), str(vertex.y), str(vertex.z)]) + "\n"
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string += "\n"
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if len(self.model.tex_coords) > 0:
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for tex_coord in self.model.tex_coords:
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string += "vt " + ' '.join([str(tex_coord.x), str(tex_coord.y)]) + "\n"
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string += "\n"
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if len(self.model.normals) > 0:
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for normal in self.model.normals:
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string += "vn " + ' '.join([str(normal.x), str(normal.y), str(normal.z)]) + "\n"
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string += "\n"
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faces = sum(map(lambda x: x.faces, self.model.parts), [])
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for face in faces:
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if face.material is not None and face.material.name != current_material:
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current_material = face.material.name
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string += "usemtl " + current_material + "\n"
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string += "f "
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arr = []
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for v in [face.a, face.b, face.c]:
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sub_arr = []
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sub_arr.append(str(v.vertex + 1))
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if v.normal is None:
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if v.tex_coord is not None:
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sub_arr.append('')
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sub_arr.append(str(v.tex_coord + 1))
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elif v.tex_coord is not None:
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sub_arr.append(str(v.tex_coord + 1))
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if v.normal is not None:
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sub_arr.append(str(v.normal + 1))
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arr.append('/'.join(sub_arr))
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string += ' '.join(arr) + '\n'
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return string
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