since fbx is a fairly structured format I wondered how hard it would be to make a parser in python.
Heres the first cut.
To make it useful I also added mesh import - only verts and faces.
Id really like if others could help coding this - the code is below, FBX isnt that hard to read and you can test with FBX exporter too and see how it works. 
def parse_fbx(path, fbx_data):
DEBUG = False
f = open(path, 'rU')
lines = f.readlines()
# remove comments and
lines = [l[:-1].rstrip() for l in lines if not l.lstrip().startswith(';')]
# remove whitespace
lines = [l for l in lines if l]
# remove multiline float lists
def unmultiline(i):
lines[i-1] = lines[i-1] + lines.pop(i).lstrip()
# Multiline floats, used for verts and matricies, this is harderto read so detect and make into 1 line.
i = 0
while i < len(lines):
l = lines[i].strip()
if l.startswith(','):
unmultiline(i)
i-=1
try:
float(l.split(',', 1)[0])
unmultiline(i)
i-=1
except:
pass
i += 1
CONTAINER = [None]
def isfloat(val):
try:
CONTAINER[0] = float(val)
return True
except:
return False
def isfloatlist(val):
try:
CONTAINER[0] = tuple([float(v) for v in val.split(',')])
return True
except:
return False
def read_fbx(i, ls):
if DEBUG:
print "LINE:", lines[i]
tag, val = lines[i].split(':', 1)
tag = tag.lstrip()
val = val.strip()
if val == '':
ls.append((tag, None, None))
if val.endswith('{'):
name = val[:-1].strip() # remove the trailing {
if name == '': name = None
sub_ls = []
ls.append((tag, name, sub_ls))
i+=1
while lines[i].strip() != '}':
i = read_fbx(i, sub_ls)
elif val.startswith('"') and val.endswith('"'):
ls.append((tag, None, val[1:-1])) # remove quotes
elif isfloat(val):
ls.append((tag, None, CONTAINER[0]))
elif isfloatlist(val):
ls.append((tag, None, CONTAINER[0]))
#name = .lstrip()[0]
if DEBUG:
print 'TAG:', tag
print 'VAL:', val
return i+1
i=0
while i < len(lines):
i = read_fbx(i, fbx_data)
# Blender code starts here:
import bpy
def import_fbx(path):
fbx_data = []
parse_fbx(path, fbx_data)
# Now lets get in the mesh data for fun.
sce = bpy.data.scenes.active
sce.objects.selected = []
for tag1, name1, value1 in fbx_data:
if tag1 == 'Objects':
for tag2, name2, value2 in value1:
if tag2 == 'Model':
print tag2, name2
# we dont parse this part properly
# the name2 can be somtrhing like
# Model "Model::kimiko", "Mesh"
if name2.endswith(' "Mesh"'):
verts = None
faces = None
# We have a mesh
for tag3, name3, value3 in value2:
# print 'FOO ', tag3, name3
if tag3 == 'Vertices':
#print value3
verts = value3
elif tag3 == 'PolygonVertexIndex':
#print value3
faces = value3
# convert odd fbx verts and faces to a blender mesh.
if verts and faces:
me = bpy.data.meshes.new()
# get a list of floats as triples
me.verts.extend( [verts[i-3:i] for i in xrange(3, len(verts)+3, 3)] )
# get weirdo face indicies
face = []
blen_faces = [face]
for f in faces:
if f<0:
face.append(int(-f)-1)
face = []
blen_faces.append(face)
else:
face.append(int(f))
if not blen_faces[-1]:
del blen_faces[-1]
me.faces.extend(blen_faces)
sce.objects.new(me)
#import_fbx('/test.fbx')
import Blender
if __name__ == '__main__':
Blender.Window.FileSelector(import_fbx, 'ASCII FBX 6.1', '*.fbx')
