Fix #1725 Texture can now be plugged directly on socket

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

@@ -17,7 +17,6 @@
 from ...material.gltf2_blender_gather_texture_info import gather_texture_info
 from ..gltf2_blender_search_node_tree import \
     has_image_node_from_socket, \
-    get_socket_from_gltf_material_node, \
     get_socket, \
     get_factor_from_socket
 
@@ -53,13 +52,13 @@ def export_specular(blender_material, export_settings):
 
         # Texture
         if has_image_node_from_socket(specular_socket, export_settings):
-            original_specular_texture, uvmap_info, _ = gather_texture_info(
+            specular_texture, uvmap_info, _ = gather_texture_info(
                 specular_socket,
                 (specular_socket,),
                 (),
                 export_settings,
             )
-            specular_extension['specularTexture'] = original_specular_texture
+            specular_extension['specularTexture'] = specular_texture
             uvmap_infos.update({'specularTexture': uvmap_info})
 
     if specularcolor_non_linked is True:
@@ -74,13 +73,13 @@ def export_specular(blender_material, export_settings):
 
         # Texture
         if has_image_node_from_socket(speculartint_socket, export_settings):
-            original_specularcolor_texture, uvmap_info, _ = gather_texture_info(
+            specularcolor_texture, uvmap_info, _ = gather_texture_info(
                 speculartint_socket,
                 (speculartint_socket,),
                 (),
                 export_settings,
             )
-            specular_extension['specularColorTexture'] = original_specularcolor_texture
+            specular_extension['specularColorTexture'] = specularcolor_texture
             uvmap_infos.update({'specularColorTexture': uvmap_info})
 
     return Extension('KHR_materials_specular', specular_extension, False), uvmap_infos

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

@@ -72,7 +72,7 @@ def export_volume(blender_material, export_settings):
         volume_extension['thicknessFactor'] = fac if fac != None else 1.0
         has_thickness_texture = True
 
-       # Pack thickness channel (R).
+       # Pack thickness channel (G).
     if has_thickness_texture:
         thickness_slots = (thickness_socket,)
 

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

@@ -232,7 +232,7 @@ def __get_image_data_mapping(sockets, default_sockets, results, export_settings)
 
         else:
             # rudimentarily try follow the node tree to find the correct image data.
-            src_chan = Channel.R
+            src_chan = None
             for elem in result.path:
                 if isinstance(elem.from_node, bpy.types.ShaderNodeSeparateColor):
                     src_chan = {
@@ -243,6 +243,35 @@ def __get_image_data_mapping(sockets, default_sockets, results, export_settings)
                 if elem.from_socket.name == 'Alpha':
                     src_chan = Channel.A
 
+
+            if src_chan is None:
+                # No SeparateColor node found, so take the specification channel that is needed
+                # So export is correct if user plug the texture directly to the socket
+                if socket.socket.name == 'Metallic':
+                    src_chan = Channel.B
+                elif socket.socket.name == 'Roughness':
+                    src_chan = Channel.G
+                elif socket.socket.name == 'Occlusion':
+                    src_chan = Channel.R
+                elif socket.socket.name == 'Alpha':
+                    src_chan = Channel.A
+                elif socket.socket.name == 'Coat Weight':
+                    src_chan = Channel.R
+                elif socket.socket.name == 'Coat Roughness':
+                    src_chan = Channel.G
+                elif socket.socket.name == 'Thickness': # For KHR_materials_volume
+                    src_chan = Channel.G
+
+            if src_chan is None:
+                # Seems we can't find the channel
+                # We are in a case where user plugged a texture in a Color socket, but we may have used the alpha one
+                if socket.socket.name in ["Alpha", "Specular IOR Level", "Sheen Roughness"]:
+                    src_chan = Channel.A
+
+            if src_chan is None:
+                # We definitely can't find the channel, so keep the first channel even if this is wrong
+                src_chan = Channel.R
+
             dst_chan = None
 
             # some sockets need channel rewriting (gltf pbr defines fixed channels for some attributes)

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

@@ -49,7 +49,7 @@ def detect_shadeless_material(blender_material, export_settings):
     else:
         return None
 
-    socket = NodeSocket(socket, [blender_material.node_tree])
+    socket = NodeSocket(socket, [blender_material])
 
     # Be careful not to misidentify a lightpath trick as mix-alpha.
     result = __detect_lightpath_trick(socket)