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# Copyright 2018-2019 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import bpy
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.io.com.gltf2_io_extensions import Extension
from io_scene_gltf2.blender.exp import gltf2_blender_gather_texture_info, gltf2_blender_export_keys
from io_scene_gltf2.blender.exp import gltf2_blender_search_node_tree
from io_scene_gltf2.blender.exp import gltf2_blender_gather_materials_pbr_metallic_roughness
from io_scene_gltf2.blender.exp import gltf2_blender_gather_materials_unlit
from ..com.gltf2_blender_extras import generate_extras
from io_scene_gltf2.blender.exp import gltf2_blender_get
from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
from io_scene_gltf2.io.com.gltf2_io_debug import print_console
@cached
def gather_material(blender_material, export_settings):
"""
Gather the material used by the blender primitive.
:param blender_material: the blender material used in the glTF primitive
:param export_settings:
:return: a glTF material
"""
if not __filter_material(blender_material, export_settings):
return None
mat_unlit = __gather_material_unlit(blender_material, export_settings)
if mat_unlit is not None:
return mat_unlit
orm_texture = __gather_orm_texture(blender_material, export_settings)
material = gltf2_io.Material(
alpha_cutoff=__gather_alpha_cutoff(blender_material, export_settings),
alpha_mode=__gather_alpha_mode(blender_material, export_settings),
double_sided=__gather_double_sided(blender_material, export_settings),
emissive_factor=__gather_emissive_factor(blender_material, export_settings),
emissive_texture=__gather_emissive_texture(blender_material, export_settings),
extensions=__gather_extensions(blender_material, export_settings),
extras=__gather_extras(blender_material, export_settings),
name=__gather_name(blender_material, export_settings),
normal_texture=__gather_normal_texture(blender_material, export_settings),
occlusion_texture=__gather_occlusion_texture(blender_material, orm_texture, export_settings),
pbr_metallic_roughness=__gather_pbr_metallic_roughness(blender_material, orm_texture, export_settings)
)
export_user_extensions('gather_material_hook', export_settings, material, blender_material)
return material
# material = blender_primitive['material']
#
# if get_material_requires_texcoords(glTF, material) and not export_settings['gltf_texcoords']:
# material = -1
#
# if get_material_requires_normals(glTF, material) and not export_settings['gltf_normals']:
# material = -1
#
# # Meshes/primitives without material are allowed.
# if material >= 0:
# primitive.material = material
# else:
# print_console('WARNING', 'Material ' + internal_primitive[
# 'material'] + ' not found. Please assign glTF 2.0 material or enable Blinn-Phong material in export.')
def __filter_material(blender_material, export_settings):
return export_settings[gltf2_blender_export_keys.MATERIALS]
def __gather_alpha_cutoff(blender_material, export_settings):
if blender_material.blend_method == 'CLIP':
return blender_material.alpha_threshold
return None
def __gather_alpha_mode(blender_material, export_settings):
if blender_material.blend_method == 'CLIP':
return 'MASK'
elif blender_material.blend_method in ['BLEND', 'HASHED']:
return 'BLEND'
return None
def __gather_double_sided(blender_material, export_settings):
if not blender_material.use_backface_culling:
return True
old_double_sided_socket = gltf2_blender_get.get_socket_old(blender_material, "DoubleSided")
if old_double_sided_socket is not None and\
not old_double_sided_socket.is_linked and\
old_double_sided_socket.default_value > 0.5:
return True
return None
def __gather_emissive_factor(blender_material, export_settings):
emissive_socket = gltf2_blender_get.get_socket(blender_material, "Emissive")
if emissive_socket is None:
emissive_socket = gltf2_blender_get.get_socket_old(blender_material, "EmissiveFactor")
if isinstance(emissive_socket, bpy.types.NodeSocket):
factor = gltf2_blender_get.get_factor_from_socket(emissive_socket, kind='RGB')
if factor is None and emissive_socket.is_linked:
# In glTF, the default emissiveFactor is all zeros, so if an emission texture is connected,
# we have to manually set it to all ones.
factor = [1.0, 1.0, 1.0]
if factor is None: factor = [0.0, 0.0, 0.0]
# Handle Emission Strength
strength_socket = None
if emissive_socket.node.type == 'EMISSION':
strength_socket = emissive_socket.node.inputs['Strength']
elif 'Emission Strength' in emissive_socket.node.inputs:
strength_socket = emissive_socket.node.inputs['Emission Strength']
strength = (
gltf2_blender_get.get_const_from_socket(strength_socket, kind='VALUE')
if strength_socket is not None
else None
)
if strength is not None:
factor = [f * strength for f in factor]
# Clamp to range [0,1]
factor = [min(1.0, f) for f in factor]
if factor == [0, 0, 0]: factor = None
return factor
return None
def __gather_emissive_texture(blender_material, export_settings):
emissive = gltf2_blender_get.get_socket(blender_material, "Emissive")
if emissive is None:
emissive = gltf2_blender_get.get_socket_old(blender_material, "Emissive")
return gltf2_blender_gather_texture_info.gather_texture_info(emissive, (emissive,), export_settings)
def __gather_extensions(blender_material, export_settings):
extensions = {}
# KHR_materials_clearcoat
clearcoat_extension = __gather_clearcoat_extension(blender_material, export_settings)
if clearcoat_extension:
extensions["KHR_materials_clearcoat"] = clearcoat_extension
# KHR_materials_transmission
transmission_extension = __gather_transmission_extension(blender_material, export_settings)
if transmission_extension:
extensions["KHR_materials_transmission"] = transmission_extension
return extensions if extensions else None
def __gather_extras(blender_material, export_settings):
if export_settings['gltf_extras']:
return generate_extras(blender_material)
return None
def __gather_name(blender_material, export_settings):
return blender_material.name
def __gather_normal_texture(blender_material, export_settings):
normal = gltf2_blender_get.get_socket(blender_material, "Normal")
if normal is None:
normal = gltf2_blender_get.get_socket_old(blender_material, "Normal")
return gltf2_blender_gather_texture_info.gather_material_normal_texture_info_class(
normal,
(normal,),
export_settings)
def __gather_orm_texture(blender_material, export_settings):
# Check for the presence of Occlusion, Roughness, Metallic sharing a single image.
# If not fully shared, return None, so the images will be cached and processed separately.
occlusion = gltf2_blender_get.get_socket(blender_material, "Occlusion")
if occlusion is None or not __has_image_node_from_socket(occlusion):
occlusion = gltf2_blender_get.get_socket_old(blender_material, "Occlusion")
if occlusion is None or not __has_image_node_from_socket(occlusion):
return None
metallic_socket = gltf2_blender_get.get_socket(blender_material, "Metallic")
roughness_socket = gltf2_blender_get.get_socket(blender_material, "Roughness")
hasMetal = metallic_socket is not None and __has_image_node_from_socket(metallic_socket)
hasRough = roughness_socket is not None and __has_image_node_from_socket(roughness_socket)
if not hasMetal and not hasRough:
metallic_roughness = gltf2_blender_get.get_socket_old(blender_material, "MetallicRoughness")
if metallic_roughness is None or not __has_image_node_from_socket(metallic_roughness):
return None
result = (occlusion, metallic_roughness)
elif not hasMetal:
result = (occlusion, roughness_socket)
elif not hasRough:
result = (occlusion, metallic_socket)
else:
result = (occlusion, roughness_socket, metallic_socket)
if not gltf2_blender_gather_texture_info.check_same_size_images(result):
print_console("INFO",
"Occlusion and metal-roughness texture will be exported separately "
"(use same-sized images if you want them combined)")
return None
# Double-check this will past the filter in texture_info
info = gltf2_blender_gather_texture_info.gather_texture_info(result[0], result, export_settings)
if info is None:
return None
return result
def __gather_occlusion_texture(blender_material, orm_texture, export_settings):
occlusion = gltf2_blender_get.get_socket(blender_material, "Occlusion")
if occlusion is None:
occlusion = gltf2_blender_get.get_socket_old(blender_material, "Occlusion")
return gltf2_blender_gather_texture_info.gather_material_occlusion_texture_info_class(
occlusion,
orm_texture or (occlusion,),
export_settings)
def __gather_pbr_metallic_roughness(blender_material, orm_texture, export_settings):
return gltf2_blender_gather_materials_pbr_metallic_roughness.gather_material_pbr_metallic_roughness(
blender_material,
orm_texture,
export_settings)
def __has_image_node_from_socket(socket):
result = gltf2_blender_search_node_tree.from_socket(
socket,
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
if not result:
return False
return True
def __gather_clearcoat_extension(blender_material, export_settings):
clearcoat_enabled = False
has_clearcoat_texture = False
has_clearcoat_roughness_texture = False
clearcoat_extension = {}
clearcoat_roughness_slots = ()
clearcoat_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat')
clearcoat_roughness_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat Roughness')
clearcoat_normal_socket = gltf2_blender_get.get_socket(blender_material, 'Clearcoat Normal')
if isinstance(clearcoat_socket, bpy.types.NodeSocket) and not clearcoat_socket.is_linked:
clearcoat_extension['clearcoatFactor'] = clearcoat_socket.default_value
clearcoat_enabled = clearcoat_extension['clearcoatFactor'] > 0
elif __has_image_node_from_socket(clearcoat_socket):
clearcoat_extension['clearcoatFactor'] = 1
has_clearcoat_texture = True
clearcoat_enabled = True
if not clearcoat_enabled:
return None
if isinstance(clearcoat_roughness_socket, bpy.types.NodeSocket) and not clearcoat_roughness_socket.is_linked:
clearcoat_extension['clearcoatRoughnessFactor'] = clearcoat_roughness_socket.default_value
elif __has_image_node_from_socket(clearcoat_roughness_socket):
clearcoat_extension['clearcoatRoughnessFactor'] = 1
has_clearcoat_roughness_texture = True
# Pack clearcoat (R) and clearcoatRoughness (G) channels.
if has_clearcoat_texture and has_clearcoat_roughness_texture:
clearcoat_roughness_slots = (clearcoat_socket, clearcoat_roughness_socket,)
elif has_clearcoat_texture:
clearcoat_roughness_slots = (clearcoat_socket,)
elif has_clearcoat_roughness_texture:
clearcoat_roughness_slots = (clearcoat_roughness_socket,)
if len(clearcoat_roughness_slots) > 0:
if has_clearcoat_texture:
clearcoat_extension['clearcoatTexture'] = gltf2_blender_gather_texture_info.gather_texture_info(
clearcoat_socket,
clearcoat_roughness_slots,
export_settings,
)
if has_clearcoat_roughness_texture:
clearcoat_extension['clearcoatRoughnessTexture'] = gltf2_blender_gather_texture_info.gather_texture_info(
clearcoat_roughness_socket,
clearcoat_roughness_slots,
export_settings,
)
if __has_image_node_from_socket(clearcoat_normal_socket):
clearcoat_extension['clearcoatNormalTexture'] = gltf2_blender_gather_texture_info.gather_material_normal_texture_info_class(
clearcoat_normal_socket,
(clearcoat_normal_socket,),
export_settings
)
return Extension('KHR_materials_clearcoat', clearcoat_extension, False)
def __gather_transmission_extension(blender_material, export_settings):
transmission_enabled = False
has_transmission_texture = False
transmission_extension = {}
transmission_slots = ()
transmission_socket = gltf2_blender_get.get_socket(blender_material, 'Transmission')
if isinstance(transmission_socket, bpy.types.NodeSocket) and not transmission_socket.is_linked:
transmission_extension['transmissionFactor'] = transmission_socket.default_value
transmission_enabled = transmission_extension['transmissionFactor'] > 0
elif __has_image_node_from_socket(transmission_socket):
transmission_extension['transmissionFactor'] = 1
has_transmission_texture = True
transmission_enabled = True
if not transmission_enabled:
return None
# Pack transmission channel (R).
if has_transmission_texture:
transmission_slots = (transmission_socket,)
if len(transmission_slots) > 0:
combined_texture = gltf2_blender_gather_texture_info.gather_texture_info(
transmission_socket,
transmission_slots,
export_settings,
)
if has_transmission_texture:
transmission_extension['transmissionTexture'] = combined_texture
return Extension('KHR_materials_transmission', transmission_extension, False)
def __gather_material_unlit(blender_material, export_settings):
gltf2_unlit = gltf2_blender_gather_materials_unlit
info = gltf2_unlit.detect_shadeless_material(blender_material, export_settings)
if info is None:
return None
material = gltf2_io.Material(
alpha_cutoff=__gather_alpha_cutoff(blender_material, export_settings),
alpha_mode=__gather_alpha_mode(blender_material, export_settings),
double_sided=__gather_double_sided(blender_material, export_settings),
extensions={"KHR_materials_unlit": Extension("KHR_materials_unlit", {}, required=False)},
extras=__gather_extras(blender_material, export_settings),
name=__gather_name(blender_material, export_settings),
emissive_factor=None,
emissive_texture=None,
normal_texture=None,
occlusion_texture=None,
pbr_metallic_roughness=gltf2_io.MaterialPBRMetallicRoughness(
base_color_factor=gltf2_unlit.gather_base_color_factor(info, export_settings),
base_color_texture=gltf2_unlit.gather_base_color_texture(info, export_settings),
metallic_factor=0.0,
roughness_factor=0.9,
metallic_roughness_texture=None,
extensions=None,
extras=None,
)
)
export_user_extensions('gather_material_unlit_hook', export_settings, material, blender_material)
return material
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