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Speed up FBX export of face material indices with numpy #104450

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Bastien Montagne merged 1 commits from Mysteryem/blender-addons:fbx_numpy_face_materials_pr into main 2023-03-06 15:10:58 +01:00
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1 changed files with 18 additions and 7 deletions
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25
io_scene_fbx/export_fbx_bin.py
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@ -1213,16 +1213,27 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
elem_data_single_string(lay_ma, b"Name", b"")
nbr_mats = len(me_fbxmaterials_idx)
if nbr_mats > 1:
t_pm = array.array(data_types.ARRAY_INT32, (0,)) * len(me.polygons)
bl_pm_dtype = np.uintc
fbx_pm_dtype = np.int32
t_pm = np.empty(len(me.polygons), dtype=bl_pm_dtype)
me.polygons.foreach_get("material_index", t_pm)
# We have to validate mat indices, and map them to FBX indices.
# Note a mat might not be in me_fbxmats_idx (e.g. node mats are ignored).
def_ma = next(me_fbxmaterials_idx[m] for m in me_blmaterials if m in me_fbxmaterials_idx)
blmaterials_to_fbxmaterials_idxs = [me_fbxmaterials_idx.get(m, def_ma) for m in me_blmaterials]
ma_idx_limit = len(blmaterials_to_fbxmaterials_idxs)
_gen = (blmaterials_to_fbxmaterials_idxs[m] if m < ma_idx_limit else def_ma for m in t_pm)
t_pm = array.array(data_types.ARRAY_INT32, _gen)
# Note a mat might not be in me_fbxmaterials_idx (e.g. node mats are ignored).
# The first valid material will be used for materials out of bounds of me_blmaterials or materials not
# in me_fbxmaterials_idx.
def_me_blmaterial_idx, def_ma = next(
(i, me_fbxmaterials_idx[m]) for i, m in enumerate(me_blmaterials) if m in me_fbxmaterials_idx)
# Set material indices that are out of bounds to the default material index
mat_idx_limit = len(me_blmaterials)
t_pm[t_pm >= mat_idx_limit] = def_me_blmaterial_idx
# Map to FBX indices. Materials not in me_fbxmaterials_idx will be set to the default material index.
blmat_fbx_idx = np.fromiter((me_fbxmaterials_idx.get(m, def_ma) for m in me_blmaterials),
dtype=fbx_pm_dtype)
t_pm = blmat_fbx_idx[t_pm]
elem_data_single_string(lay_ma, b"MappingInformationType", b"ByPolygon")
# XXX Logically, should be "Direct" reference type, since we do not have any index array, and have one