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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2022 The glTF-Blender-IO authors.
import bpy
from io_scene_gltf2.io.com.gltf2_io_extensions import Extension
from io_scene_gltf2.blender.exp import gltf2_blender_get
from io_scene_gltf2.blender.exp import gltf2_blender_gather_texture_info
def export_emission_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):
if export_settings['gltf_image_format'] != "NONE":
factor = gltf2_blender_get.get_factor_from_socket(emissive_socket, kind='RGB')
else:
factor = gltf2_blender_get.get_const_from_default_value_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]
# Official glTF clamp to range [0,1]
# If we are outside, we need to use extension KHR_materials_emissive_strength
if factor == [0, 0, 0]: factor = None
return factor
return None
def export_emission_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")
emissive_texture, use_actives_uvmap_emissive, _ = gltf2_blender_gather_texture_info.gather_texture_info(emissive, (emissive,), export_settings)
return emissive_texture, ["emissiveTexture"] if use_actives_uvmap_emissive else None
def export_emission_strength_extension(emissive_factor, export_settings):
emissive_strength_extension = {}
emissive_strength_extension['emissiveStrength'] = max(emissive_factor)
return Extension('KHR_materials_emissive_strength', emissive_strength_extension, False)
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