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objloader.py
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objloader.py
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class MeshData(object):
def __init__(self, **kwargs):
self.name = kwargs.get("name")
self.vertex_format = [
(b'v_pos', 3, 'float'),
(b'v_normal', 3, 'float'),
(b'v_tc0', 2, 'float')]
self.vertices = []
self.indices = []
def calculate_normals(self):
for i in range(len(self.indices) / (3)):
fi = i * 3
v1i = self.indices[fi]
v2i = self.indices[fi + 1]
v3i = self.indices[fi + 2]
vs = self.vertices
p1 = [vs[v1i + c] for c in range(3)]
p2 = [vs[v2i + c] for c in range(3)]
p3 = [vs[v3i + c] for c in range(3)]
u, v = [0, 0, 0], [0, 0, 0]
for j in range(3):
v[j] = p2[j] - p1[j]
u[j] = p3[j] - p1[j]
n = [0, 0, 0]
n[0] = u[1] * v[2] - u[2] * v[1]
n[1] = u[2] * v[0] - u[0] * v[2]
n[2] = u[0] * v[1] - u[1] * v[0]
for k in range(3):
self.vertices[v1i + 3 + k] = n[k]
self.vertices[v2i + 3 + k] = n[k]
self.vertices[v3i + 3 + k] = n[k]
class ObjFile:
def finish_object(self):
if self._current_object is None:
return
mesh = MeshData()
idx = 0
for f in self.faces:
verts = f[0]
norms = f[1]
tcs = f[2]
for i in range(3):
# get normal components
n = (0.0, 0.0, 0.0)
if norms[i] != -1:
n = self.normals[norms[i] - 1]
# get texture coordinate components
t = (0.0, 0.0)
if tcs[i] != -1:
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)
tri = [idx, idx + 1, idx + 2]
mesh.indices.extend(tri)
idx += 3
self.objects[self._current_object] = mesh
# mesh.calculate_normals()
self.faces = []
def __init__(self, filename, swapyz=False):
"""Loads a Wavefront OBJ file. """
self.objects = {}
self.vertices = []
self.normals = []
self.texcoords = []
self.faces = []
self._current_object = None
material = None
for line in open(filename, "r"):
if line.startswith('#'):
continue
if line.startswith('s'):
continue
values = line.split()
if not values:
continue
if values[0] == 'o':
self.finish_object()
self._current_object = values[1]
# elif values[0] == 'mtllib':
# self.mtl = MTL(values[1])
# elif values[0] in ('usemtl', 'usemat'):
# material = values[1]
if values[0] == 'v':
v = list(map(float, values[1:4]))
if swapyz:
v = v[0], v[2], v[1]
self.vertices.append(v)
elif values[0] == 'vn':
v = list(map(float, values[1:4]))
if swapyz:
v = v[0], v[2], v[1]
self.normals.append(v)
elif values[0] == 'vt':
self.texcoords.append(map(float, values[1:3]))
elif values[0] == 'f':
face = []
texcoords = []
norms = []
for v in values[1:]:
w = v.split('/')
face.append(int(w[0]))
if len(w) >= 2 and len(w[1]) > 0:
texcoords.append(int(w[1]))
else:
texcoords.append(-1)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]))
else:
norms.append(-1)
self.faces.append((face, norms, texcoords, material))
self.finish_object()
def MTL(filename):
contents = {}
mtl = None
return
for line in open(filename, "r"):
if line.startswith('#'):
continue
values = line.split()
if not values:
continue
if values[0] == 'newmtl':
mtl = contents[values[1]] = {}
elif mtl is None:
raise ValueError("mtl file doesn't start with newmtl stmt")
mtl[values[0]] = values[1:]
return contents