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OBJ IO: Use Principled BSDF's Alpha new setting. 

Much better than using Principled's Transmission setting as we did
before...

Part of T64609.
This commit is contained in:
Bastien Montagne 2019-05-15 21:17:08 +02:00
parent 44dd3564bb
commit 05baedacbf
3 changed files with 9 additions and 9 deletions
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2
io_scene_obj/__init__.py
View File

@ -21,7 +21,7 @@
bl_info = {
"name": "Wavefront OBJ format",
"author": "Campbell Barton, Bastien Montagne",
"version": (3, 5, 6),
"version": (3, 5, 7),
"blender": (2, 80, 0),
"location": "File > Import-Export",
"description": "Import-Export OBJ, Import OBJ mesh, UV's, materials and textures",

6
io_scene_obj/export_obj.py
View File

@ -74,7 +74,7 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
if mat_wrap:
use_mirror = mat_wrap.metallic != 0.0
use_transparency = mat_wrap.transmission != 0.0
use_transparency = mat_wrap.alpha != 1.0
# XXX Totally empirical conversion, trying to adapt it
# (from 1.0 - 0.0 Principled BSDF range to 0.0 - 900.0 OBJ specular exponent range)...
@ -94,7 +94,7 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
# XXX Not supported by current Principled-based shader.
fw('Ke 0.0 0.0 0.0\n')
fw('Ni %.6f\n' % mat_wrap.ior) # Refraction index
fw('d %.6f\n' % (1.0 - mat_wrap.transmission)) # Alpha (obj uses 'd' for dissolve)
fw('d %.6f\n' % mat_wrap.alpha) # Alpha (obj uses 'd' for dissolve)
# See http://en.wikipedia.org/wiki/Wavefront_.obj_file for whole list of values...
# Note that mapping is rather fuzzy sometimes, trying to do our best here.
@ -116,7 +116,7 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
"map_Ka": None, # ambient...
"map_Ks": "specular_texture",
"map_Ns": "roughness_texture",
"map_d": "transmission_texture",
"map_d": "alpha_texture",
"map_Tr": None, # transmission roughness?
"map_Bump": "normalmap_texture",
"disp": None, # displacement...

10
io_scene_obj/import_obj.py
View File

@ -176,7 +176,7 @@ def create_materials(filepath, relpath,
_generic_tex_set(mat_wrap.normalmap_texture, image, 'UV', map_offset, map_scale)
elif type == 'D':
_generic_tex_set(mat_wrap.transmission_texture, image, 'UV', map_offset, map_scale)
_generic_tex_set(mat_wrap.alpha_texture, image, 'UV', map_offset, map_scale)
elif type == 'disp':
# XXX Not supported?
@ -245,8 +245,8 @@ def create_materials(filepath, relpath,
if do_transparency:
if "ior" not in context_material_vars:
context_mat_wrap.ior = 1.0
if "transmission" not in context_material_vars:
context_mat_wrap.transmission = 1.0
if "alpha" not in context_material_vars:
context_mat_wrap.alpha = 1.0
# EEVEE only
context_material.blend_method = 'BLEND'
@ -341,8 +341,8 @@ def create_materials(filepath, relpath,
context_mat_wrap.ior = float_func(line_split[1])
context_material_vars.add("ior")
elif line_id == b'd': # dissolve (transparency)
context_mat_wrap.transmission = 1.0 - float_func(line_split[1])
context_material_vars.add("transmission")
context_mat_wrap.alpha = float_func(line_split[1])
context_material_vars.add("alpha")
elif line_id == b'tr': # translucency
print("WARNING, currently unsupported 'tr' translucency option, skipped.")
elif line_id == b'tf':