model-converter-python/d3/model/obj.py

127 lines
3.7 KiB
Python

#!/usr/bin/env python3
from .basemodel import ModelParser, Exporter, Vertex, TexCoord, Normal, FaceVertex, Face, Material
from functools import reduce
import os.path
import PIL.Image
def is_obj(filename):
return filename[-4:] == '.obj'
class OBJParser(ModelParser):
def __init__(self):
super().__init__()
self.mtl = None
def parse_line(self, string):
if string == '':
return
split = string.split()
first = split[0]
split = split[1:]
if first == 'usemtl':
self.currentMaterial = split[0]
elif first == 'mtllib':
path = os.path.join(os.path.dirname(self.path), split[0])
self.mtl = MTLParser(self)
self.mtl.parse_file(path)
elif first == 'v':
self.add_vertex(Vertex().from_array(split))
elif first == 'vn':
self.add_normal(Normal().from_array(split))
elif first == 'vt':
self.add_tex_coord(TexCoord().from_array(split))
elif first == 'f':
splits = list(map(lambda x: x.split('/'), split))
for i in range(len(splits)):
for j in range(len(splits[i])):
if splits[i][j] is not '':
splits[i][j] = int(splits[i][j]) - 1
self.add_face(Face().from_array(splits))
class MTLParser:
def __init__(self, parent):
self.parent = parent
self.materials = []
self.current_mtl = None
def parse_line(self, string):
if string == '':
return
split = string.split()
first = split[0]
split = split[1:]
if first == 'newmtl':
self.current_mtl = Material(split[0])
self.materials.append(self.current_mtl)
elif first == 'Ka':
self.current_mtl.Ka = Vertex().from_array(split)
elif first == 'Kd':
self.current_mtl.Kd = Vertex().from_array(split)
elif first == 'Ks':
self.current_mtl.Ks = Vertex().from_array(split)
elif first == 'map_Kd':
self.map_Kd = PIL.Image.open(os.path.join(os.path.dirname(self.parent.path), split[0]))
def parse_file(self, path):
with open(path) as f:
for line in f.readlines():
line = line.rstrip()
self.parse_line(line)
class OBJExporter(Exporter):
def __init__(self, model):
super().__init__(model)
def __str__(self):
string = ""
for vertex in self.model.vertices:
string += "v " + ' '.join([str(vertex.x), str(vertex.y), str(vertex.z)]) + "\n"
string += "\n"
if len(self.model.tex_coords) > 0:
for tex_coord in self.model.tex_coords:
string += "vt " + ' '.join([str(tex_coord.x), str(tex_coord.y)]) + "\n"
string += "\n"
if len(self.model.normals) > 0:
for normal in self.model.normals:
string += "vn " + ' '.join([str(normal.x), str(normal.y), str(normal.z)]) + "\n"
string += "\n"
for face in self.model.faces:
string += "f "
arr = []
for v in [face.a, face.b, face.c]:
sub_arr = []
sub_arr.append(str(v.vertex + 1))
if v.normal is None:
if v.texture is not None:
sub_arr.append('')
sub_arr.append(str(v.texture + 1))
elif v.texture is not None:
sub_arr.append(str(v.texture + 1))
if v.normal is not None:
sub_arr.append(str(v.normal + 1))
arr.append('/'.join(sub_arr))
string += ' '.join(arr) + '\n'
return string