diff options
Diffstat (limited to 'io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_emission.py')
| -rw-r--r-- | io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_emission.py | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_emission.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_emission.py new file mode 100644 index 00000000..562fc19d --- /dev/null +++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_emission.py @@ -0,0 +1,61 @@ +# 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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