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import os
import numpy as np
class MeshData(object):
def __init__(self, **kwargs):
self.name = kwargs.get("name")
self.vertex_format = [
('v_pos', 3, 'float'),
('v_normal', 3, 'float'),
('v_tc0', 2, 'float'),
('v_ambient', 3, 'float'),
('v_diffuse', 3, 'float'),
('v_specular', 3, 'float')
]
self.vertices = []
self.indices = []
# Default basic material of mesh object
self.diffuse_color = np.array([1.0, 1.0, 1.0])
self.ambient_color = np.array([1.0, 1.0, 1.0])
self.specular_color = np.array([1.0, 1.0, 1.0])
self.specular_coefficent = 16.0
self.transparency = 1.0
def set_materials(self, mtl_dict):
self.diffuse_color = mtl_dict.get('Kd', self.diffuse_color)
self.diffuse_color = np.array([float(v) for v in self.diffuse_color])
self.ambient_color = mtl_dict.get('Ka', self.ambient_color)
self.ambient_color = np.array([float(v) for v in self.ambient_color])
self.specular_color = mtl_dict.get('Ks', self.specular_color)
self.specular_color = np.array([float(v) for v in self.specular_color])
self.specular_coefficent = float(
mtl_dict.get('Ns', self.specular_coefficent))
transparency = mtl_dict.get('d')
if not transparency:
transparency = 1.0 - float(mtl_dict.get('Tr', 0))
self.transparency = float(transparency)
class MTL(object):
def __init__(self, filename):
self.contents = {}
self.filename = filename
if not os.path.exists(filename):
return
for line in open(filename, "r"):
if line.startswith('#'):
continue
values = line.split()
if not values:
continue
if values[0] == 'newmtl':
mtl = self.contents[values[1]] = {}
elif mtl is None:
raise ValueError("mtl file doesn't start with newmtl stmt")
if len(values[1:]) > 1:
mtl[values[0]] = values[1:]
else:
mtl[values[0]] = values[1]
def __getitem__(self, key):
return self.contents[key]
def get(self, key, default=None):
return self.contents.get(key, default)
class ObjHandle(object):
""" """
def __init__(self, filename=None, swapyz=False, delimiter=None,
vertices=None, normals=None, texcoords=None, faces=None, face_norms=None, face_texs=None,
obj_material=None, mtl=None, triangulate=False):
if filename is not None:
self.load(filename, swapyz, delimiter, triangulate=triangulate)
else:
self.vertices = np.array(vertices) if vertices is not None else np.array([])
self.normals = np.array(normals) if normals is not None else np.array([])
self.texcoords = np.array(texcoords) if texcoords is not None else np.array([])
self.faces = np.array(faces) if faces is not None else np.array([[]])
self.face_norms = np.array(face_norms) if face_norms is not None else np.empty((self.faces.shape[0], 0))
self.face_texs = np.array(face_texs) if face_texs is not None else np.empty((self.faces.shape[0], 0))
if swapyz:
self.vertices = self.vertices[: [0, 2, 1]]
self.normals = self.normals[: [0, 2, 1]]
self.objects = {}
self._current_object = None
self.obj_material = obj_material
self.mtl = mtl
def load(self, filename, swapyz=False, delimiter=None, triangulate=False):
"""Loads a Wavefront OBJ file. """
self.objects = {}
self.vertices = []
self.normals = []
self.texcoords = []
self.faces = []
self.face_norms = []
self.face_texs = []
self._current_object = None
self.mtl = None
self.obj_material = None
for line in open(filename, "r", encoding="utf8"):
if delimiter is not None and delimiter == "# object" and "# object" in line:
if self._current_object:
self.finish_object()
self._current_object = line.split()[2]
if line.startswith('#'):
continue
if line.startswith('s'):
continue
values = line.split()
if not values:
continue
if values[0] == 'o' and len(self.vertices) != 0:
self.finish_object()
self._current_object = values[1]
elif values[0] == 'mtllib':
# load materials file here
self.mtl = MTL(values[1])
elif values[0] in ('usemtl', 'usemat'):
self.obj_material = values[1]
if values[0] == 'v':
v = list(map(float, values[1:4]))
if swapyz:
v = [v[0], v[2], v[1]]
#v = [v[1], v[2], v[0]]
self.vertices.append(v)
elif values[0] == 'vn':
v = list(map(float, values[1:4]))
if swapyz:
v = [v[0], v[2], v[1]]
#v = [v[1], v[2], v[0]]
self.normals.append(v)
elif values[0] == 'vt':
self.texcoords.append(list(map(float, values[1:3])))
elif values[0] == 'f':
if not triangulate or len(values) == 4:
face = []
texcoords = []
norms = []
for v in values[1:]:
w = v.split('/')
face.append(int(w[0]) - 1)
if len(w) >= 2 and len(w[1]) > 0:
if '//' not in v:
texcoords.append(int(w[1]) - 1)
else:
norms.append(int(w[1]) - 1)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]) - 1)
self.faces.append(face)
self.face_norms.append(norms)
self.face_texs.append(texcoords)
else:
face = []
texcoords = []
norms = []
for v in values[1:4]:
w = v.split('/')
face.append(int(w[0]) - 1)
if len(w) >= 2 and len(w[1]) > 0:
if '//' not in v:
texcoords.append(int(w[1]) - 1)
else:
norms.append(int(w[1]) - 1)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]) - 1)
self.faces.append(face)
self.face_norms.append(norms)
self.face_texs.append(texcoords)
face = []
texcoords = []
norms = []
for v in [values[1], values[3], values[4]]:
w = v.split('/')
face.append(int(w[0]) - 1)
if len(w) >= 2 and len(w[1]) > 0:
if '//' not in v:
texcoords.append(int(w[1]) - 1)
else:
norms.append(int(w[1]) - 1)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]) - 1)
self.faces.append(face)
self.face_norms.append(norms)
self.face_texs.append(texcoords)
self.finish_object()
def finish_object(self):
self.vertices = np.array(self.vertices)
self.normals = np.array(self.normals)
self.texcoords = np.array(self.texcoords)
self.faces = np.array(self.faces)
self.face_norms = np.array(self.face_norms)
self.face_texs = np.array(self.face_texs)
if self._current_object is None:
return
mesh = MeshData()
idx = 0
material = self.mtl.get(self.obj_material)
if material:
mesh.set_materials(material)
for verts, norms, tcs in zip(self.faces, self.face_norms, self.face_texs):
# verts = f[0]
# norms = f[1]
# tcs = f[2]
for i in range(3):
# get normal components
n = np.array([0.0, 0.0, 0.0])
if norms is not None:
n = self.normals[norms[i] - 1]
# get texture coordinate components
t = np.array([0.0, 0.0])
if tcs is not None:
t = self.texcoords[tcs[i] - 1]
# get vertex components
v = self.vertices[verts[i] - 1]
data = [v[0], v[1], v[2], n[0], n[1], n[2], t[0], t[1]]
mesh.vertices.extend(data)
# add material info in the vertice
mesh.vertices.extend(
mesh.ambient_color +
mesh.diffuse_color +
mesh.specular_color
)
tri = [idx, idx + 1, idx + 2]
mesh.indices.extend(tri)
idx += 3
mesh.vertices = np.array(mesh.vertices)
mesh.indices = np.array(mesh.indices)
self.objects[self._current_object] = mesh
# mesh.calculate_normals()
self.faces = []
def write(self, filename, swapyz=False):
# NOTE: NO CONSIDERATION FOR DELIMITER NOW
with open(filename, 'w') as f:
if self.mtl is not None:
f.write(f"mtllib {self.mtl.filename}\n")
for v in self.vertices:
if swapyz:
v = v[0], v[2], v[1]
f.write(f"v {v[0]:.6f} {v[1]:.6f} {v[2]:.6f}\n")
if self.texcoords.size != 0:
for vt in self.texcoords:
f.write(f"vt {vt[0]:.6f} {vt[1]:.6f}\n")
if self.normals.size != 0:
for vn in self.normals:
if swapyz:
vn = vn[0], vn[2], vn[1]
f.write(f"vn {vn[0]:.6f} {vn[1]:.6f} {vn[2]:.6f}\n")
if self.obj_material is not None:
f.write(f"usemtl {self.obj_material}\n")
for verts, norms, tcs in zip(self.faces, self.face_norms, self.face_texs):
f.write("f ")
for i in range(verts.shape[0]):
f.write(f"{verts[i] + 1}")
if tcs.size != 0:
f.write(f"/{tcs[i] + 1}")
elif norms.size != 0:
f.write("/")
if norms.size != 0:
f.write(f"/{norms[i] + 1}")
if i != verts.shape[0] - 1:
f.write(" ")
f.write("\n")
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