def parse_ply(fname):
m = Mesh()
state = 'init'
format_re = re.compile('format\\s+ascii\\s+1.0')
comment_re = re.compile('comment\\s.*')
element_re = re.compile('element\\s+(?P<name>\\w+)\\s+(?P<num>\\d+)')
property_re = re.compile('property\\s+(?P<type>\\w+)\\s+(?P<name>\\w+)')
property_list_re = re.compile('property\\s+list\\s+(?P<itype>\\w+)\\s+(?P<etype>\\w+)\\s+(?P<name>\\w+)')
element_types = []
vertex_names = {
'x': lambda v, x: v.setX(x),
'y': lambda v, y: v.setY(y),
'z': lambda v, z: v.setZ(z),
'nx': lambda v, nx: v.setNX(nx),
'ny': lambda v, ny: v.setNY(ny),
'nz': lambda v, nz: v.setNZ(nz),
's': lambda v, s: v.setS(s),
't': lambda v, t: v.setT(t)
}
face_names = {
#'vertex_indices': (lambda f, l, m=m: f.set([m.getVertex(v) for v in l])) #real values of vertices
'vertex_indices': (lambda f, l, m=m: f.set(l)) #references to vertices
}
element_type_dict = {
'vertex' : (lambda: Vertex(), vertex_names, lambda v, m=m: m.addVertex(v)),
'face' : (lambda: Face(), face_names, lambda f, m=m: m.addFace(f))
}
type_handles = {
'float' : get_float,
'double' : get_double,
'char' : get_char,
'uchar' : get_uchar,
'short' : get_short,
'ushort' : get_ushort,
'int' : get_int,
'uint' : get_uint
}
i = 0
j = 0
for line in open(fname, 'r'):
line = line.rstrip()
if state == 'init':
if line != 'ply':
raise RuntimeError('PLY: file is not a ply file')
state = 'format'
elif state == 'format':
if not format_re.match(line):
raise RuntimeError('PLY: unsupported ply format')
state = 'header'
elif state == 'header':
if comment_re.match(line):
#comment, do nothing
continue
match = element_re.match(line)
if match:
element_types.append((match.group('name'), int(match.group('num')), []))
continue
match = property_list_re.match(line)
if match:
element_types[-1][2].append((match.group('name'), 'list', match.group('itype'), match.group('etype')))
continue
match = property_re.match(line)
if match:
element_types[-1][2].append((match.group('name'), match.group('type')))
continue
if line == 'end_header':
state = 'body'
continue
raise RuntimeError('PLY: unknown header field')
elif state == 'body':
if j >= element_types[i][1]:
j = 0
i = i + 1
if i >= len(element_types):
raise RuntimeExeception('PLY: too much data in file')
line = line.split()
actions = element_type_dict[element_types[i][0]]
obj = actions[0]()
for property in element_types[i][2]:
x = None
if property[1] == 'list':
numelems = type_handles[property[2]](line[0])
line = line[1:]
x = []
for count in range(numelems):
x.append(type_handles[property[3]](line[0]))
line = line[1:]
else:
x = type_handles[property[1]](line[0])
line = line[1:]
actions[1][property[0]](obj, x)
actions[2](obj)
j = j + 1
return m
