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Fix T57308: (hopefully) FBX export UV islands broken. 

Looks like we need to not merge UVs from different islands into same set
of coordinates in the 'compressed' mapped storage of FBX data, seems to
be the way for that piece of crap of a wanabe format to convey islands
concept...

Gets the code even more cryptic, yay!
This commit is contained in:
Bastien Montagne 2019-01-12 12:56:48 +01:00
parent 46a9160c6f
commit a2e1c4f1d1
Notes: blender-bot 2023-02-14 19:25:30 +01:00 
Referenced by issue #57308, Perfectly overlapping UV islands (result from applied mirror modifier) of exported FBX mesh get broken into individual polygon UV islands when imported into Maya 2018
2 changed files with 13 additions and 7 deletions
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2
io_scene_fbx/__init__.py
View File

@ -21,7 +21,7 @@
bl_info = {
"name": "FBX format",
"author": "Campbell Barton, Bastien Montagne, Jens Restemeier",
"version": (4, 13, 1),
"version": (4, 14, 0),
"blender": (2, 80, 0),
"location": "File > Import-Export",
"description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",

18
io_scene_fbx/export_fbx_bin.py
View File

@ -1100,10 +1100,14 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
# Textures are now only related to materials, in FBX!
uvnumber = len(me.uv_layers)
if uvnumber:
def _uvtuples_gen(raw_uvs):
return zip(*(iter(raw_uvs),) * 2)
# Looks like this mapping is also expected to convey UV islands (arg..... :((((( ).
# So we need to generate unique triplets (uv, vertex_idx) here, not only just based on UV values.
def _uvtuples_gen(raw_uvs, raw_lvidxs):
return zip(zip(*(iter(raw_uvs),) * 2), raw_lvidxs)
t_luv = array.array(data_types.ARRAY_FLOAT64, (0.0,)) * len(me.loops) * 2
t_lvidx = array.array(data_types.ARRAY_INT32, (0,)) * len(me.loops)
me.loops.foreach_get("vertex_index", t_lvidx)
for uvindex, uvlayer in enumerate(me.uv_layers):
uvlayer.data.foreach_get("uv", t_luv)
lay_uv = elem_data_single_int32(geom, b"LayerElementUV", uvindex)
@ -1112,13 +1116,15 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
elem_data_single_string(lay_uv, b"MappingInformationType", b"ByPolygonVertex")
elem_data_single_string(lay_uv, b"ReferenceInformationType", b"IndexToDirect")
uv2idx = tuple(set(_uvtuples_gen(t_luv)))
elem_data_single_float64_array(lay_uv, b"UV", chain(*uv2idx)) # Flatten again...
uv_ids = tuple(set(_uvtuples_gen(t_luv, t_lvidx)))
elem_data_single_float64_array(lay_uv, b"UV", chain(*(uv for uv, vidx in uv_ids))) # Flatten again...
uv2idx = {uv: idx for idx, uv in enumerate(uv2idx)}
elem_data_single_int32_array(lay_uv, b"UVIndex", (uv2idx[uv] for uv in _uvtuples_gen(t_luv)))
uv2idx = {uv_id: idx for idx, uv_id in enumerate(uv_ids)}
elem_data_single_int32_array(lay_uv, b"UVIndex", (uv2idx[uv_id] for uv_id in _uvtuples_gen(t_luv, t_lvidx)))
del uv2idx
del uv_ids
del t_luv
del t_lvidx
del _uvtuples_gen
# Face's materials.