glTF exporter: Manage active UVMap correclty, when there is no UVMap used in node tree

io_scene_gltf2/__init__.py

@@ -4,7 +4,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (3, 2, 14),
+    "version": (3, 2, 15),
     'blender': (3, 1, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py

 # SPDX-License-Identifier: Apache-2.0
 # Copyright 2018-2021 The glTF-Blender-IO authors.
 
+from copy import deepcopy
 import bpy
 
 from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached, cached_by_key
@@ -17,14 +18,17 @@ from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extension
 from io_scene_gltf2.io.com.gltf2_io_debug import print_console
 
 @cached
-def get_material_cache_key(blender_material, export_settings):
+def get_material_cache_key(blender_material, active_uvmap_index, export_settings):
     # Use id of material
     # Do not use bpy.types that can be unhashable
     # Do not use material name, that can be not unique (when linked)
-    return ((id(blender_material),))
+    return (
+      (id(blender_material),),
+      (active_uvmap_index,)
+    )
 
 @cached_by_key(key=get_material_cache_key)
-def gather_material(blender_material, export_settings):
+def gather_material(blender_material, active_uvmap_index, export_settings):
     """
     Gather the material used by the blender primitive.
 
@@ -35,26 +39,79 @@ def gather_material(blender_material, export_settings):
     if not __filter_material(blender_material, export_settings):
         return None
 
-    mat_unlit = __gather_material_unlit(blender_material, export_settings)
+    mat_unlit = __gather_material_unlit(blender_material, active_uvmap_index, export_settings)
     if mat_unlit is not None:
         return mat_unlit
 
     orm_texture = __gather_orm_texture(blender_material, export_settings)
 
-    material = gltf2_io.Material(
+    emissive_texture, uvmap_actives_emissive_texture = __gather_emissive_texture(blender_material, export_settings)
+    extensions, uvmap_actives_extensions = __gather_extensions(blender_material, export_settings)
+    normal_texture, uvmap_actives_normal_texture = __gather_normal_texture(blender_material, export_settings)
+    occlusion_texture, uvmap_actives_occlusion_texture = __gather_occlusion_texture(blender_material, orm_texture, export_settings)
+    pbr_metallic_roughness, uvmap_actives_pbr_metallic_roughness = __gather_pbr_metallic_roughness(blender_material, orm_texture, export_settings)
+
+    base_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),
+        emissive_texture=emissive_texture,
+        extensions=extensions,
         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)
+        normal_texture=normal_texture,
+        occlusion_texture=occlusion_texture,
+        pbr_metallic_roughness=pbr_metallic_roughness
     )
 
+
+    # merge all uvmap_actives
+    uvmap_actives = []
+    if uvmap_actives_emissive_texture:
+        uvmap_actives.extend(uvmap_actives_emissive_texture)
+    if uvmap_actives_extensions:
+        uvmap_actives.extend(uvmap_actives_extensions)
+    if uvmap_actives_normal_texture:
+        uvmap_actives.extend(uvmap_actives_normal_texture)
+    if uvmap_actives_occlusion_texture:
+        uvmap_actives.extend(uvmap_actives_occlusion_texture)
+    if uvmap_actives_pbr_metallic_roughness:
+        uvmap_actives.extend(uvmap_actives_pbr_metallic_roughness)
+
+    # Because some part of material are shared (eg pbr_metallic_roughness), we must copy the material
+    # Texture must be shared, but not TextureInfo
+    material = deepcopy(base_material)
+    __get_new_material_texture_shared(base_material, material)
+
+    active_uvmap_index = active_uvmap_index if active_uvmap_index != 0 else None
+
+    for tex in uvmap_actives:
+        if tex == "emissiveTexture":
+            material.emissive_texture.tex_coord = active_uvmap_index
+        elif tex == "normalTexture":
+            material.normal_texture.tex_coord = active_uvmap_index
+        elif tex == "occlusionTexture":
+            material.occlusion_texture.tex_coord = active_uvmap_index
+        elif tex == "baseColorTexture":
+            material.pbr_metallic_roughness.base_color_texture.tex_coord = active_uvmap_index
+        elif tex == "metallicRoughnessTexture":
+            material.pbr_metallic_roughness.metallic_roughness_texture.tex_coord = active_uvmap_index
+        elif tex == "clearcoatTexture":
+            material.extensions["KHR_materials_clearcoat"].extension['clearcoatTexture'].tex_coord = active_uvmap_index
+        elif tex == "clearcoatRoughnessTexture":
+            material.extensions["KHR_materials_clearcoat"].extension['clearcoatRoughnessTexture'].tex_coord = active_uvmap_index
+        elif tex == "clearcoatNormalTexture": #TODO not tested yet
+            material.extensions["KHR_materials_clearcoat"].extension['clearcoatNormalTexture'].tex_coord = active_uvmap_index
+        elif tex == "transmissionTexture": #TODO not tested yet
+            material.extensions["KHR_materials_transmission"].extension['transmissionTexture'].tex_coord = active_uvmap_index
+
+    # If material is not using active UVMap, we need to return the same material,
+    # Even if multiples meshes are using different active UVMap
+    if len(uvmap_actives) == 0 and active_uvmap_index != -1:
+        material = gather_material(blender_material, -1, export_settings)
+
+
     # If emissive is set, from an emissive node (not PBR)
     # We need to set manually default values for
     # pbr_metallic_roughness.baseColor
@@ -80,6 +137,25 @@ def gather_material(blender_material, export_settings):
     #             'material'] + ' not found. Please assign glTF 2.0 material or enable Blinn-Phong material in export.')
 
 
+def __get_new_material_texture_shared(base, node):
+        if node is None:
+            return
+        if callable(node) is True:
+            return
+        if node.__str__().startswith('__'):
+            return
+        if type(node) in [gltf2_io.TextureInfo, gltf2_io.MaterialOcclusionTextureInfoClass, gltf2_io.MaterialNormalTextureInfoClass]:
+            node.index = base.index
+        else:
+            if hasattr(node, '__dict__'):
+                for attr, value in node.__dict__.items():
+                    __get_new_material_texture_shared(getattr(base, attr), value)
+            else:
+                # For extensions (on a dict)
+                if type(node).__name__ == 'dict':
+                    for i in node.keys():
+                        __get_new_material_texture_shared(base[i], node[i])
+
 def __filter_material(blender_material, export_settings):
     return export_settings[gltf2_blender_export_keys.MATERIALS]
 
@@ -155,17 +231,20 @@ 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)
+    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 __gather_extensions(blender_material, export_settings):
     extensions = {}
 
     # KHR_materials_clearcoat
+    actives_uvmaps = []
 
-    clearcoat_extension = __gather_clearcoat_extension(blender_material, export_settings)
+    clearcoat_extension, use_actives_uvmap_clearcoat = __gather_clearcoat_extension(blender_material, export_settings)
     if clearcoat_extension:
         extensions["KHR_materials_clearcoat"] = clearcoat_extension
+        actives_uvmaps.extend(use_actives_uvmap_clearcoat)
 
     # KHR_materials_transmission
 
@@ -173,7 +252,7 @@ def __gather_extensions(blender_material, export_settings):
     if transmission_extension:
         extensions["KHR_materials_transmission"] = transmission_extension
 
-    return extensions if extensions else None
+    return extensions, actives_uvmaps if extensions else None
 
 
 def __gather_extras(blender_material, export_settings):
@@ -190,10 +269,11 @@ 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_texture, use_active_uvmap_normal = gltf2_blender_gather_texture_info.gather_material_normal_texture_info_class(
         normal,
         (normal,),
         export_settings)
+    return normal_texture, ["normalTexture"] if use_active_uvmap_normal else None
 
 
 def __gather_orm_texture(blender_material, export_settings):
@@ -231,7 +311,7 @@ def __gather_orm_texture(blender_material, export_settings):
         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)
+    info, info_use_active_uvmap = gltf2_blender_gather_texture_info.gather_texture_info(result[0], result, export_settings)
     if info is None:
         return None
 
@@ -241,10 +321,11 @@ 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_texture, use_active_uvmap_occlusion = gltf2_blender_gather_texture_info.gather_material_occlusion_texture_info_class(
         occlusion,
         orm_texture or (occlusion,),
         export_settings)
+    return occlusion_texture, ["occlusionTexture"] if use_active_uvmap_occlusion else None
 
 
 def __gather_pbr_metallic_roughness(blender_material, orm_texture, export_settings):
@@ -284,7 +365,7 @@ def __gather_clearcoat_extension(blender_material, export_settings):
         clearcoat_enabled = True
 
     if not clearcoat_enabled:
-        return None
+        return None, None
 
     if isinstance(clearcoat_roughness_socket, bpy.types.NodeSocket) and not clearcoat_roughness_socket.is_linked:
         clearcoat_extension['clearcoatRoughnessFactor'] = clearcoat_roughness_socket.default_value
@@ -302,28 +383,38 @@ def __gather_clearcoat_extension(blender_material, export_settings):
     elif has_clearcoat_roughness_texture:
         clearcoat_roughness_slots = (clearcoat_roughness_socket,)
 
+    use_actives_uvmaps = []
+
     if len(clearcoat_roughness_slots) > 0:
         if has_clearcoat_texture:
-            clearcoat_extension['clearcoatTexture'] = gltf2_blender_gather_texture_info.gather_texture_info(
+            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
+            if clearcoat_texture_use_active_uvmap:
+                use_actives_uvmaps.append("clearcoatTexture")
         if has_clearcoat_roughness_texture:
-            clearcoat_extension['clearcoatRoughnessTexture'] = gltf2_blender_gather_texture_info.gather_texture_info(
+            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
+            if clearcoat_roughness_texture_use_active_uvmap:
+                use_actives_uvmaps.append("clearcoatRoughnessTexture")
     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_texture, clearcoat_normal_texture_use_active_uvmap = gltf2_blender_gather_texture_info.gather_material_normal_texture_info_class(
             clearcoat_normal_socket,
             (clearcoat_normal_socket,),
             export_settings
         )
+        clearcoat_extension['clearcoatNormalTexture'] = clearcoat_normal_texture
+        if clearcoat_normal_texture_use_active_uvmap:
+            use_actives_uvmaps.append("clearcoatNormalTexture")
 
-    return Extension('KHR_materials_clearcoat', clearcoat_extension, False)
+    return Extension('KHR_materials_clearcoat', clearcoat_extension, False), use_actives_uvmaps
 
 def __gather_transmission_extension(blender_material, export_settings):
     transmission_enabled = False
@@ -350,7 +441,7 @@ def __gather_transmission_extension(blender_material, export_settings):
         transmission_slots = (transmission_socket,)
 
     if len(transmission_slots) > 0:
-        combined_texture = gltf2_blender_gather_texture_info.gather_texture_info(
+        combined_texture, use_active_uvmap = gltf2_blender_gather_texture_info.gather_texture_info(
             transmission_socket,
             transmission_slots,
             export_settings,
@@ -358,17 +449,19 @@ def __gather_transmission_extension(blender_material, export_settings):
         if has_transmission_texture:
             transmission_extension['transmissionTexture'] = combined_texture
 
-    return Extension('KHR_materials_transmission', transmission_extension, False)
+    return Extension('KHR_materials_transmission', transmission_extension, False), ["transmissionTexture"] if use_active_uvmap else []
 
 
-def __gather_material_unlit(blender_material, export_settings):
+def __gather_material_unlit(blender_material, active_uvmap_index, 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(
+    base_color_texture, use_active_uvmap = gltf2_unlit.gather_base_color_texture(info, export_settings)
+
+    base_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),
@@ -382,7 +475,7 @@ def __gather_material_unlit(blender_material, export_settings):
 
         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),
+            base_color_texture=base_color_texture,
             metallic_factor=0.0,
             roughness_factor=0.9,
             metallic_roughness_texture=None,
@@ -391,6 +484,19 @@ def __gather_material_unlit(blender_material, export_settings):
         )
     )
 
+    if use_active_uvmap is not None:
+        # Because some part of material are shared (eg pbr_metallic_roughness), we must copy the material
+        # Texture must be shared, but not TextureInfo
+        material = deepcopy(base_material)
+        __get_new_material_texture_shared(base_material, material)
+        material.pbr_metallic_roughness.base_color_texture.tex_coord = active_uvmap_index
+    elif use_active_uvmap is None and active_uvmap_index != -1:
+        # If material is not using active UVMap, we need to return the same material,
+        # Even if multiples meshes are using different active UVMap
+        material = gather_material(blender_material, -1, export_settings)
+    else:
+        material = base_material
+
     export_user_extensions('gather_material_unlit_hook', export_settings, material, blender_material)
 
     return material

io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py

@@ -13,21 +13,31 @@ from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extension
 @cached
 def gather_material_pbr_metallic_roughness(blender_material, orm_texture, export_settings):
     if not __filter_pbr_material(blender_material, export_settings):
-        return None
+        return None, None
+
+    base_color_texture, use_active_uvmap_base_color_texture = __gather_base_color_texture(blender_material, export_settings)
+    metallic_roughness_texture, use_active_uvmap_metallic_roughness_texture = __gather_metallic_roughness_texture(blender_material, orm_texture, export_settings)
 
     material = gltf2_io.MaterialPBRMetallicRoughness(
         base_color_factor=__gather_base_color_factor(blender_material, export_settings),
-        base_color_texture=__gather_base_color_texture(blender_material, export_settings),
+        base_color_texture=base_color_texture,
         extensions=__gather_extensions(blender_material, export_settings),
         extras=__gather_extras(blender_material, export_settings),
         metallic_factor=__gather_metallic_factor(blender_material, export_settings),
-        metallic_roughness_texture=__gather_metallic_roughness_texture(blender_material, orm_texture, export_settings),
+        metallic_roughness_texture=metallic_roughness_texture,
         roughness_factor=__gather_roughness_factor(blender_material, export_settings)
     )
 
+    # merge all use_active_uvmap infos
+    uvmap_actives = []
+    if use_active_uvmap_base_color_texture is True:
+        uvmap_actives.append("baseColorTexture")
+    if use_active_uvmap_metallic_roughness_texture is True:
+        uvmap_actives.append("metallicRoughnessTexture")
+
     export_user_extensions('gather_material_pbr_metallic_roughness_hook', export_settings, material, blender_material, orm_texture)
 
-    return material
+    return material, uvmap_actives
 
 
 def __filter_pbr_material(blender_material, export_settings):
@@ -82,7 +92,7 @@ def __gather_base_color_texture(blender_material, export_settings):
         if socket is not None and __has_image_node_from_socket(socket)
     )
     if not inputs:
-        return None
+        return None, None
 
     return gltf2_blender_gather_texture_info.gather_texture_info(inputs[0], inputs, export_settings)
 
@@ -118,7 +128,7 @@ def __gather_metallic_roughness_texture(blender_material, orm_texture, export_se
     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
+            return None, None
         texture_input = (metallic_roughness,)
     elif not hasMetal:
         texture_input = (roughness_socket,)

io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_unlit.py

@@ -127,9 +127,10 @@ def gather_base_color_texture(info, export_settings):
         # because gather_image determines how to pack images based on the
         # names of sockets, and the names are hard-coded to a Principled
         # style graph.
-        return gltf2_blender_gather_texture_info.gather_texture_info(
+        unlit_texture, unlit_use_active_uvmap = gltf2_blender_gather_texture_info.gather_texture_info(
             sockets[0],
             sockets,
             export_settings,
         )
-    return None
+        return unlit_texture, ["unlitTexture"] if unlit_use_active_uvmap else None
+    return None, None

io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives.py

@@ -57,6 +57,13 @@ def gather_primitives(
     """
     primitives = []
 
+    # retrieve active render UVMap
+    active_uvmap_idx = 0
+    for i in range(len(blender_mesh.uv_layers)):
+        if blender_mesh.uv_layers[i].active_render is True:
+            active_uvmap_idx = i
+            break
+
     blender_primitives = __gather_cache_primitives(blender_mesh, uuid_for_skined_data,
         vertex_groups, modifiers, export_settings)
 
@@ -73,7 +80,8 @@ def gather_primitives(
             if mat is not None:
                 material = gltf2_blender_gather_materials.gather_material(
                     mat,
-                    export_settings,
+                    active_uvmap_idx,
+                    export_settings
                 )
 
         primitive = gltf2_io.MeshPrimitive(

io_scene_gltf2/blender/exp/gltf2_blender_gather_texture_info.py

@@ -36,15 +36,15 @@ def __gather_texture_info_helper(
         kind: str,
         export_settings):
     if not __filter_texture_info(primary_socket, blender_shader_sockets, export_settings):
-        return None
+        return None, None
 
-    tex_transform, tex_coord = __gather_texture_transform_and_tex_coord(primary_socket, export_settings)
+    tex_transform, tex_coord, use_active_uvmap = __gather_texture_transform_and_tex_coord(primary_socket, export_settings)
 
     fields = {
         'extensions': __gather_extensions(tex_transform, export_settings),
         'extras': __gather_extras(blender_shader_sockets, export_settings),
         'index': __gather_index(blender_shader_sockets, export_settings),
-        'tex_coord': tex_coord,
+        'tex_coord': tex_coord
     }
 
     if kind == 'DEFAULT':
@@ -59,11 +59,11 @@ def __gather_texture_info_helper(
         texture_info = gltf2_io.MaterialOcclusionTextureInfoClass(**fields)
 
     if texture_info.index is None:
-        return None
+        return None, None
 
     export_user_extensions('gather_texture_info_hook', export_settings, texture_info, blender_shader_sockets)
 
-    return texture_info
+    return texture_info, use_active_uvmap
 
 
 def __filter_texture_info(primary_socket, blender_shader_sockets, export_settings):
@@ -151,15 +151,17 @@ def __gather_texture_transform_and_tex_coord(primary_socket, export_settings):
         node = previous_node(node.inputs['Vector'])
 
     texcoord_idx = 0
+    use_active_uvmap = True
     if node and node.type == 'UVMAP' and node.uv_map:
         # Try to gather map index.
         for blender_mesh in bpy.data.meshes:
             i = blender_mesh.uv_layers.find(node.uv_map)
             if i >= 0:
                 texcoord_idx = i
+                use_active_uvmap = False
                 break
 
-    return texture_transform, texcoord_idx or None
+    return texture_transform, texcoord_idx or None, use_active_uvmap
 
 
 def __get_tex_from_socket(socket):