merge channels (metallic/Roughness) : use default value

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_clearcoat.py

@@ -65,6 +65,7 @@ def export_clearcoat(blender_material, export_settings):
             clearcoat_texture, clearcoat_texture_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 clearcoat_socket,
                 clearcoat_roughness_slots,
+                (),
                 export_settings,
             )
             clearcoat_extension['clearcoatTexture'] = clearcoat_texture
@@ -74,6 +75,7 @@ def export_clearcoat(blender_material, export_settings):
             clearcoat_roughness_texture, clearcoat_roughness_texture_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 clearcoat_roughness_socket,
                 clearcoat_roughness_slots,
+                (),
                 export_settings,
             )
             clearcoat_extension['clearcoatRoughnessTexture'] = clearcoat_roughness_texture

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_emission.py

@@ -62,7 +62,7 @@ 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)
+    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):

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_sheen.py

@@ -50,6 +50,7 @@ def export_sheen(blender_material, export_settings):
             original_sheenColor_texture, original_sheenColor_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 sheenColor_socket,
                 (sheenColor_socket,),
+                (),
                 export_settings,
             )
             sheen_extension['sheenColorTexture'] = original_sheenColor_texture
@@ -74,6 +75,7 @@ def export_sheen(blender_material, export_settings):
             original_sheenRoughness_texture, original_sheenRoughness_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 sheenRoughness_socket,
                 (sheenRoughness_socket,),
+                (),
                 export_settings,
             )
             sheen_extension['sheenRoughnessTexture'] = original_sheenRoughness_texture

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_specular.py

@@ -49,6 +49,7 @@ def export_original_specular(blender_material, export_settings):
             original_specular_texture, original_specular_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 original_specular_socket,
                 (original_specular_socket,),
+                (),
                 export_settings,
             )
             specular_extension['specularTexture'] = original_specular_texture
@@ -71,6 +72,7 @@ def export_original_specular(blender_material, export_settings):
             original_specularcolor_texture, original_specularcolor_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
                 original_specularcolor_socket,
                 (original_specularcolor_socket,),
+                (),
                 export_settings,
             )
             specular_extension['specularColorTexture'] = original_specularcolor_texture
@@ -162,6 +164,7 @@ def normalize(c):
         specularColorTexture, use_active_uvmap, specularColorFactor = gltf2_blender_gather_texture_info.gather_texture_info(
             primary_socket,
             sockets,
+            (),
             export_settings,
             filter_type='ANY')
         if specularColorTexture is None:

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_transmission.py

@@ -48,6 +48,7 @@ def export_transmission(blender_material, export_settings):
         combined_texture, use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
             transmission_socket,
             transmission_slots,
+            (),
             export_settings,
         )
         if has_transmission_texture:

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_gather_materials_volume.py

@@ -76,6 +76,7 @@ def export_volume(blender_material, export_settings):
         combined_texture, use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
             thicknesss_socket,
             thickness_slots,
+            (),
             export_settings,
         )
         if has_thickness_texture:

addons/io_scene_gltf2/blender/exp/material/extensions/gltf2_blender_image.py

@@ -38,6 +38,11 @@ class FillWhite:
     """Fills a channel with all ones (1.0)."""
     pass
 
+class FillWith:
+    """Fills a channel with all same values"""
+    def __init__(self, value):
+        self.value = value
+
 class StoreData:
     def __init__(self, data):
         """Store numeric data (not an image channel"""
@@ -109,6 +114,9 @@ def store_data(self, identifier, data, type='Image'):
     def fill_white(self, dst_chan: Channel):
         self.fills[dst_chan] = FillWhite()
 
+    def fill_with(self, dst_chan, value):
+        self.fills[dst_chan] = FillWith(value)
+
     def is_filled(self, chan: Channel) -> bool:
         return chan in self.fills
 
@@ -193,6 +201,8 @@ def __encode_unhappy(self, export_settings) -> bytes:
             for dst_chan, fill in self.fills.items():
                 if isinstance(fill, FillImage) and fill.image == image:
                     out_buf[int(dst_chan)::4] = tmp_buf[int(fill.src_chan)::4]
+                elif isinstance(fill, FillWith):
+                    out_buf[int(dst_chan)::4] = fill.value
 
         tmp_buf = None  # GC this
 

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_image.py

@@ -28,11 +28,12 @@
 @cached
 def gather_image(
         blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
+        default_sockets: typing.Tuple[bpy.types.NodeSocket],
         export_settings):
     if not __filter_image(blender_shader_sockets, export_settings):
         return None, None
 
-    image_data = __get_image_data(blender_shader_sockets, export_settings)
+    image_data = __get_image_data(blender_shader_sockets, default_sockets, export_settings)
     if image_data.empty():
         # The export image has no data
         return None, None
@@ -184,7 +185,7 @@ def __gather_uri(image_data, mime_type, name, export_settings):
     return None, None
 
 
-def __get_image_data(sockets, export_settings) -> ExportImage:
+def __get_image_data(sockets, default_sockets, export_settings) -> ExportImage:
     # For shared resources, such as images, we just store the portion of data that is needed in the glTF property
     # in a helper class. During generation of the glTF in the exporter these will then be combined to actual binary
     # resources.
@@ -194,14 +195,22 @@ def __get_image_data(sockets, export_settings) -> ExportImage:
     if any([socket.name == "Specular" and socket.node.type == "BSDF_PRINCIPLED" for socket in sockets]):
         return __get_image_data_specular(sockets, results, export_settings)
     else:
-        return __get_image_data_mapping(sockets, results, export_settings)
+        return __get_image_data_mapping(sockets, default_sockets, results, export_settings)
 
-def __get_image_data_mapping(sockets, results, export_settings) -> ExportImage:
+def __get_image_data_mapping(sockets, default_sockets, results, export_settings) -> ExportImage:
     """
     Simple mapping
     Will fit for most of exported textures : RoughnessMetallic, Basecolor, normal, ...
     """
     composed_image = ExportImage()
+
+    default_metallic = None
+    default_roughness = None
+    if "Metallic" in [s.name for s in default_sockets]:
+        default_metallic = [s for s in default_sockets if s.name == "Metallic"][0].default_value
+    if "Roughness" in [s.name for s in default_sockets]:
+        default_roughness = [s for s in default_sockets if s.name == "Roughness"][0].default_value
+
     for result, socket in zip(results, sockets):
         # Assume that user know what he does, and that channels/images are already combined correctly for pbr
         # If not, we are going to keep only the first texture found
@@ -252,9 +261,15 @@ def __get_image_data_mapping(sockets, results, export_settings) -> ExportImage:
                 # Since metal/roughness are always used together, make sure
                 # the other channel is filled.
                 if socket.name == 'Metallic' and not composed_image.is_filled(Channel.G):
-                    composed_image.fill_white(Channel.G)
+                    if default_roughness is not None:
+                        composed_image.fill_with(Channel.G, default_roughness)
+                    else:
+                        composed_image.fill_white(Channel.G)
                 elif socket.name == 'Roughness' and not composed_image.is_filled(Channel.B):
-                    composed_image.fill_white(Channel.B)
+                    if default_metallic is not None:
+                        composed_image.fill_with(Channel.B, default_metallic)
+                    else:
+                        composed_image.fill_white(Channel.B)
             else:
                 # copy full image...eventually following sockets might overwrite things
                 composed_image = ExportImage.from_blender_image(result.shader_node.image)

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_materials.py

@@ -340,7 +340,7 @@ def __gather_orm_texture(blender_material, export_settings):
         return None
 
     # Double-check this will past the filter in texture_info
-    info, info_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(result[0], result, export_settings)
+    info, info_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(result[0], result, (), export_settings)
     if info is None:
         return None
 

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_materials_pbr_metallic_roughness.py

@@ -108,7 +108,7 @@ def __gather_base_color_texture(blender_material, export_settings):
     if not inputs:
         return None, None, None
 
-    return gltf2_blender_gather_texture_info.gather_texture_info(inputs[0], inputs, export_settings)
+    return gltf2_blender_gather_texture_info.gather_texture_info(inputs[0], inputs, (), export_settings)
 
 
 def __gather_extensions(blender_material, export_settings):
@@ -139,21 +139,26 @@ def __gather_metallic_roughness_texture(blender_material, orm_texture, export_se
     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)
 
+    default_sockets = ()
     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, None, None
         texture_input = (metallic_roughness,)
     elif not hasMetal:
         texture_input = (roughness_socket,)
+        default_sockets = (metallic_socket,)
     elif not hasRough:
         texture_input = (metallic_socket,)
+        default_sockets = (roughness_socket,)
     else:
         texture_input = (metallic_socket, roughness_socket)
+        default_sockets = ()
 
     return gltf2_blender_gather_texture_info.gather_texture_info(
         texture_input[0],
         orm_texture or texture_input,
+        default_sockets,
         export_settings,
     )
 

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_materials_unlit.py

@@ -141,6 +141,7 @@ def gather_base_color_texture(info, export_settings):
         unlit_texture, unlit_use_active_uvmap, _ = gltf2_blender_gather_texture_info.gather_texture_info(
             sockets[0],
             sockets,
+            (),
             export_settings,
         )
         return unlit_texture, ["unlitTexture"] if unlit_use_active_uvmap else None

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_texture.py

@@ -25,6 +25,7 @@
 @cached
 def gather_texture(
         blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
+        default_sockets: typing.Tuple[bpy.types.NodeSocket],
         export_settings):
     """
     Gather texture sampling information and image channels from a blender shader texture attached to a shader socket.
@@ -37,7 +38,7 @@ def gather_texture(
     if not __filter_texture(blender_shader_sockets, export_settings):
         return None, None
 
-    source, factor = __gather_source(blender_shader_sockets, export_settings)
+    source, factor = __gather_source(blender_shader_sockets, default_sockets, export_settings)
 
     texture = gltf2_io.Texture(
         extensions=__gather_extensions(blender_shader_sockets, export_settings),
@@ -88,8 +89,8 @@ def __gather_sampler(blender_shader_sockets, export_settings):
         export_settings)
 
 
-def __gather_source(blender_shader_sockets, export_settings):
-    return gltf2_blender_gather_image.gather_image(blender_shader_sockets, export_settings)
+def __gather_source(blender_shader_sockets, default_sockets, export_settings):
+    return gltf2_blender_gather_image.gather_image(blender_shader_sockets, default_sockets, export_settings)
 
 # Helpers
 

addons/io_scene_gltf2/blender/exp/material/gltf2_blender_gather_texture_info.py

@@ -29,20 +29,25 @@
 # occlusion the primary_socket would be the occlusion socket, and
 # blender_shader_sockets would be the (O,R,M) sockets.
 
-def gather_texture_info(primary_socket, blender_shader_sockets, export_settings, filter_type='ALL'):
-    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'DEFAULT', filter_type, export_settings)
+# Default socket parameter is used when there is a mapping between channels, and one of the channel is not a texture
+# In that case, we will create a texture with one channel from texture, other from default socket value
+# Example: MetallicRoughness
+
+def gather_texture_info(primary_socket, blender_shader_sockets, default_sockets, export_settings, filter_type='ALL'):
+    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, default_sockets, 'DEFAULT', filter_type, export_settings)
 
 def gather_material_normal_texture_info_class(primary_socket, blender_shader_sockets, export_settings, filter_type='ALL'):
-    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'NORMAL', filter_type, export_settings)
+    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, (), 'NORMAL', filter_type, export_settings)
 
 def gather_material_occlusion_texture_info_class(primary_socket, blender_shader_sockets, export_settings, filter_type='ALL'):
-    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'OCCLUSION', filter_type, export_settings)
+    return __gather_texture_info_helper(primary_socket, blender_shader_sockets, (), 'OCCLUSION', filter_type, export_settings)
 
 
 @cached
 def __gather_texture_info_helper(
         primary_socket: bpy.types.NodeSocket,
         blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
+        default_sockets: typing.Tuple[bpy.types.NodeSocket],
         kind: str,
         filter_type: str,
         export_settings):
@@ -51,7 +56,7 @@ def __gather_texture_info_helper(
 
     tex_transform, tex_coord, use_active_uvmap = __gather_texture_transform_and_tex_coord(primary_socket, export_settings)
 
-    index, factor = __gather_index(blender_shader_sockets, export_settings)
+    index, factor = __gather_index(blender_shader_sockets, default_sockets, export_settings)
 
     fields = {
         'extensions': __gather_extensions(tex_transform, export_settings),
@@ -146,9 +151,9 @@ def __gather_occlusion_strength(primary_socket, export_settings):
     return None
 
 
-def __gather_index(blender_shader_sockets, export_settings):
+def __gather_index(blender_shader_sockets, default_sockets, export_settings):
     # We just put the actual shader into the 'index' member
-    return gltf2_blender_gather_texture.gather_texture(blender_shader_sockets, export_settings)
+    return gltf2_blender_gather_texture.gather_texture(blender_shader_sockets, default_sockets, export_settings)
 
 
 def __gather_texture_transform_and_tex_coord(primary_socket, export_settings):