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Tentative fix for T59850: FBX: wrong alpha in some material imported by Unity. 

Looks like FBX also likes to make a mess with materials' behaviors...
Many thanks to Thomas Chollet (@thomasch) for his help understanding how
Unity handles materials' alpha when importing from FBX.

Hopefully this won't break any other importer... ;)
This commit is contained in:
Bastien Montagne 2019-05-11 15:43:25 +02:00
parent 55d0ff708c
commit 1b00d42246
2 changed files with 13 additions and 2 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, 14, 6),
"version": (4, 14, 7),
"blender": (2, 80, 0),
"location": "File > Import-Export",
"description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",

13
io_scene_fbx/export_fbx_bin.py
View File

@ -1257,7 +1257,18 @@ def fbx_data_material_elements(root, ma, scene_data):
# Not in Principled BSDF, so assuming always 0
elem_props_template_set(tmpl, props, "p_color", b"AmbientColor", ambient_color)
elem_props_template_set(tmpl, props, "p_number", b"AmbientFactor", 0.0)
elem_props_template_set(tmpl, props, "p_color", b"TransparentColor", ma_wrap.base_color)
# Sweetness... Looks like we are not the only ones to not know exactly how FBX is supposed to work (see T59850).
# According to one of its developers, Unity uses that formula to extract alpha value:
#
# alpha = 1 - TransparencyFactor
# if (alpha == 1 or alpha == 0):
# alpha = 1 - TransparentColor.r
#
# Until further info, let's assume this is correct way to do, hence the following code for TransparentColor.
if ma_wrap.transmission < 1.0e-5 or ma_wrap.transmission > (1.0 - 1.0e-5):
elem_props_template_set(tmpl, props, "p_color", b"TransparentColor", (ma_wrap.transmission,) * 3)
else:
elem_props_template_set(tmpl, props, "p_color", b"TransparentColor", ma_wrap.base_color)
elem_props_template_set(tmpl, props, "p_number", b"TransparencyFactor", ma_wrap.transmission)
elem_props_template_set(tmpl, props, "p_number", b"Opacity", 1.0 - ma_wrap.transmission)
elem_props_template_set(tmpl, props, "p_vector_3d", b"NormalMap", (0.0, 0.0, 0.0))