source/blender/nodes/shader/materialx/material.cc

@@ -11,26 +11,28 @@
 
 namespace blender::nodes::materialx {
 
-static void export_nodegraph(MaterialX::DocumentPtr doc, Depsgraph *depsgraph, Material *material)
+static void export_nodegraph(MaterialX::GraphElement *graph,
+                             Depsgraph *depsgraph,
+                             Material *material)
 {
   material->nodetree->ensure_topology_cache();
 
   bNode *output_node = ntreeShaderOutputNode(material->nodetree, SHD_OUTPUT_ALL);
-  OutputMaterialNodeParser material_node(doc, depsgraph, material, output_node);
-  material_node.compute();
+  OutputMaterialNodeParser parser(graph, depsgraph, material, output_node);
+  parser.compute();
 }
 
-static void create_standard_surface(MaterialX::DocumentPtr doc, Material *material)
+static void create_standard_surface(MaterialX::GraphElement *graph, Material *material)
 {
-  MaterialX::NodePtr surfacematerial = doc->addNode(
-      "surfacematerial", MaterialX::EMPTY_STRING, "material");
-  MaterialX::NodePtr standard_surface = doc->addNode(
+  MaterialX::NodePtr standard_surface = graph->addNode(
       "standard_surface", MaterialX::EMPTY_STRING, "surfaceshader");
 
   standard_surface->addInput("base", "float")->setValue(1.0);
   standard_surface->addInput("base_color", "color3")
       ->setValue(MaterialX::Color3(material->r, material->g, material->b));
 
+  MaterialX::NodePtr surfacematerial = graph->addNode(
+      "surfacematerial", MaterialX::EMPTY_STRING, "material");
   surfacematerial->addInput(standard_surface->getType(), standard_surface->getType())
       ->setNodeName(standard_surface->getName());
 }
@@ -39,10 +41,10 @@ MaterialX::DocumentPtr export_to_materialx(Depsgraph *depsgraph, Material *mater
 {
   MaterialX::DocumentPtr doc = MaterialX::createDocument();
   if (material->use_nodes) {
-    export_nodegraph(doc, depsgraph, material);
+    export_nodegraph(doc.get(), depsgraph, material);
   }
   else {
-    create_standard_surface(doc, material);
+    create_standard_surface(doc.get(), material);
   }
   return doc;
 }

source/blender/nodes/shader/materialx/material.h

@@ -12,7 +12,5 @@
 namespace blender::nodes::materialx {
 
 MaterialX::DocumentPtr export_to_materialx(Depsgraph *depsgraph, Material *material);
-static void create_standard_surface(MaterialX::DocumentPtr doc, Material *material);
-static void export_nodegraph(MaterialX::DocumentPtr doc, Depsgraph *depsgraph, Material *material);
 
 }  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/bsdf_principled.cc

@@ -10,117 +10,246 @@ namespace blender::nodes::materialx {
 
 NodeItem BSDFPrincipledNodeParser::compute()
 {
-  NodeItem node = create_node("standard_surface", "surfaceshader");
+  auto enabled = [](NodeItem &val) -> bool
+  {
+    if (val.node) {
+      return true;
+    }
+    if (!val.value) {
+      return false;
+    }
+    if (val.value->isA<float>()) {
+      return val.value->asA<float>() != 0.0f;
+    }
+    return true;
+  };
 
-  MaterialX::Color3 default_white_color = MaterialX::Color3(1.0, 1.0, 1.0);
-#pragma region get inputs
-  const bNodeSocket base_color_socket = node->input_by_identifier("Base Color");
-  const char *matx_input = "base_color";
-  if (base_color_socket.link) {
-    get_input_link_node(&base_color_socket, matx_node, matx_input);
-  }
-  else {
-    const float *base_color = base_color_socket.default_value_typed<bNodeSocketValueRGBA>()->value;
-    matx_node->addInput("base_color", "color3")
-        ->setValue(MaterialX::Color3(base_color[0], base_color[1], base_color[2]));
+  /* Getting required inputs
+   * Note: if some inputs are not needed they won't be taken */
+  NodeItem base_color = get_input_value("Base Color");
+
+  NodeItem subsurface = get_input_value("Subsurface");
+  NodeItem subsurface_radius = empty_value();
+  NodeItem subsurface_color = empty_value();
+  if (enabled(subsurface)) {
+    subsurface_radius = get_input_value("Subsurface Radius");
+    subsurface_color = get_input_value("Subsurface Color");
   }
 
-  const float *base_color =
-      node->input_by_identifier("Base Color").default_value_typed<bNodeSocketValueRGBA>()->value;
-  const float subsurface =
-      node->input_by_identifier("Subsurface").default_value_typed<bNodeSocketValueFloat>()->value;
+  NodeItem metallic = get_input_value("Metallic");
+  NodeItem specular = get_input_value("Specular");
+  // NodeItem specular_tint = get_input_value("Specular Tint");
+  NodeItem roughness = get_input_value("Roughness");
 
-  const float *subsurface_radius = node->input_by_identifier("Subsurface Radius")
-                                       .default_value_typed<bNodeSocketValueVector>()
-                                       ->value;
-  const float *subsurface_color = node->input_by_identifier("Subsurface Color")
-                                      .default_value_typed<bNodeSocketValueRGBA>()
-                                      ->value;
-  const float metallic =
-      node->input_by_identifier("Metallic").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float specular =
-      node->input_by_identifier("Specular").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float roughness =
-      node->input_by_identifier("Roughness").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float anisotropic =
-      node->input_by_identifier("Anisotropic").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float anisotropic_rot = node->input_by_identifier("Anisotropic Rotation")
-                                    .default_value_typed<bNodeSocketValueFloat>()
-                                    ->value;
-  const float sheen =
-      node->input_by_identifier("Sheen").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float clearcoat =
-      node->input_by_identifier("Clearcoat").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float clearcoat_roughness = node->input_by_identifier("Clearcoat Roughness")
-                                        .default_value_typed<bNodeSocketValueFloat>()
-                                        ->value;
-  const float IOR =
-      node->input_by_identifier("IOR").default_value_typed<bNodeSocketValueFloat>()->value;
-  const float transmission = node->input_by_identifier("Transmission")
-                                 .default_value_typed<bNodeSocketValueFloat>()
-                                 ->value;
-  const float *emission =
-      node->input_by_identifier("Emission").default_value_typed<bNodeSocketValueRGBA>()->value;
-  const float emission_str = node->input_by_identifier("Emission Strength")
-                                 .default_value_typed<bNodeSocketValueFloat>()
-                                 ->value;
-  const float *normal =
-      node->input_by_identifier("Normal").default_value_typed<bNodeSocketValueVector>()->value;
-  const float *clearcoat_normal = node->input_by_identifier("Clearcoat Normal")
-                                      .default_value_typed<bNodeSocketValueVector>()
-                                      ->value;
-  const float *tangent =
-      node->input_by_identifier("Tangent").default_value_typed<bNodeSocketValueVector>()->value;
-#pragma endregion get inputs
+  NodeItem anisotropic = empty_value();
+  NodeItem anisotropic_rotation = empty_value();
+  if (enabled(metallic)) {
+    /* TODO: use Specular Tint input */
+    anisotropic = get_input_value("Anisotropic");
+    if (enabled(anisotropic)) {
+        anisotropic_rotation = get_input_value("Anisotropic Rotation");
+        // anisotropic_rotation = 0.5 - (anisotropic_rotation % 1.0)
+    }
+  }
 
-#pragma region set inputs
-  matx_node->addInput("base", "float")->setValue(1.0);
-  matx_node->addInput("diffuse_roughness", "float")->setValue(roughness);
-  matx_node->addInput("normal", "vector3")
-      ->setValue(MaterialX::Vector3(normal[0], normal[1], normal[2]));
-  matx_node->addInput("tangent", "vector3")
-      ->setValue(MaterialX::Vector3(tangent[0], tangent[1], tangent[2]));
+  NodeItem sheen = get_input_value("Sheen");
+  // sheen_tint = empty_value();
+  // if enabled(sheen):
+  //     sheen_tint = get_input_value("Sheen Tint");
 
-  matx_node->addInput("metalness", "float")->setValue(metallic);
+  NodeItem clearcoat = get_input_value("Clearcoat");
+  NodeItem clearcoat_roughness = empty_value();
+  if (enabled(clearcoat)) {
+    clearcoat_roughness = get_input_value("Clearcoat Roughness");
+  }
 
-  matx_node->addInput("specular", "float")->setValue(specular);
-  matx_node->addInput("specular_color", "color3")->setValue(default_white_color);
-  matx_node->addInput("specular_roughness", "float")->setValue(roughness);
-  matx_node->addInput("specular_IOR", "float")->setValue(IOR);
-  matx_node->addInput("specular_anisotropy", "float")->setValue(anisotropic);
-  matx_node->addInput("specular_rotation", "float")->setValue(anisotropic_rot);
+  NodeItem ior = get_input_value("IOR");
 
-  matx_node->addInput("transmission", "float")->setValue(transmission);
-  matx_node->addInput("transmission_color", "color3")->setValue(default_white_color);
-  matx_node->addInput("transmission_extra_roughness", "float")->setValue(roughness);
+  NodeItem transmission = get_input_value("Transmission");
+  NodeItem transmission_roughness = empty_value();
+  if (enabled(transmission)) {
+    transmission_roughness = get_input_value("Transmission Roughness");
+  }
 
-  matx_node->addInput("subsurface", "float")->setValue(subsurface);
-  matx_node->addInput("subsurface_color", "color3")
-      ->setValue(MaterialX::Color3(subsurface_color[0], subsurface_color[1], subsurface_color[2]));
-  matx_node->addInput("subsurface_radius", "color3")
-      ->setValue(
-          MaterialX::Color3(subsurface_radius[0], subsurface_radius[1], subsurface_radius[2]));
-  matx_node->addInput("subsurface_anisotropy", "float")->setValue(anisotropic);
+  NodeItem emission = get_input_value("Emission");
+  NodeItem emission_strength = get_input_value("Emission Strength");
 
-  matx_node->addInput("sheen", "float")->setValue(sheen);
-  matx_node->addInput("sheen_color", "color3")->setValue(default_white_color);
-  matx_node->addInput("sheen_roughness", "float")->setValue(roughness);
+  NodeItem alpha = get_input_value("Alpha");
+  // transparency = 1.0 - alpha
 
-  matx_node->addInput("coat", "float")->setValue(clearcoat);
-  matx_node->addInput("coat_color", "color3")->setValue(default_white_color);
-  matx_node->addInput("coat_roughness", "float")->setValue(clearcoat_roughness);
-  matx_node->addInput("coat_IOR", "float")->setValue(IOR);
-  matx_node->addInput("coat_anisotropy", "float")->setValue(anisotropic);
-  matx_node->addInput("coat_rotation", "float")->setValue(anisotropic_rot);
-  matx_node->addInput("coat_normal", "vector3")
-      ->setValue(
-          MaterialX::Vector3(clearcoat_normal[0], clearcoat_normal[1], clearcoat_normal[2]));
+  NodeItem normal = get_input_link("Normal");
+  NodeItem clearcoat_normal = get_input_link("Clearcoat Normal");
+  NodeItem tangent = get_input_link("Tangent");
 
-  matx_node->addInput("emission", "float")->setValue(emission_str);
-  matx_node->addInput("emission_color", "color3")
-      ->setValue(MaterialX::Color3(emission[0], emission[1], emission[2]));
-#pragma endregion set inputs
-  return matx_node;
+  /* Creating standard_surface */
+  NodeItem res = create_node("standard_surface", "surfaceshader");
+  res.set_input("base", 1.0, "float");
+  res.set_input("base_color", base_color);
+  res.set_input("diffuse_roughness", roughness);
+  res.set_input("normal", normal);
+  res.set_input("tangent", tangent);
+
+  if (enabled(metallic)) {
+    res.set_input("metalness", metallic);
+  }
+
+  if (enabled(specular)) {
+    res.set_input("specular", specular);
+    res.set_input("specular_color", base_color);
+    res.set_input("specular_roughness", roughness);
+    res.set_input("specular_IOR", ior);
+    res.set_input("specular_anisotropy", anisotropic);
+    res.set_input("specular_rotation", anisotropic_rotation);
+  }
+
+  if (enabled(transmission)) {
+    res.set_input("transmission", transmission);
+    res.set_input("transmission_color", base_color);
+    res.set_input("transmission_extra_roughness", transmission_roughness);
+  }
+
+  if (enabled(subsurface)) {
+    res.set_input("subsurface", subsurface);
+    res.set_input("subsurface_color", subsurface_color);
+    res.set_input("subsurface_radius", subsurface_radius);
+    res.set_input("subsurface_anisotropy", anisotropic);
+  }
+
+  if (enabled(sheen)) {
+    res.set_input("sheen", sheen);
+    res.set_input("sheen_color", base_color);
+    res.set_input("sheen_roughness", roughness);
+  }
+
+  if (enabled(clearcoat)) {
+    res.set_input("coat", clearcoat);
+    res.set_input("coat_color", base_color);
+    res.set_input("coat_roughness", clearcoat_roughness);
+    res.set_input("coat_IOR", ior);
+    res.set_input("coat_anisotropy", anisotropic);
+    res.set_input("coat_rotation", anisotropic_rotation);
+    res.set_input("coat_normal", clearcoat_normal);
+  }
+
+  if (enabled(emission)) {
+    res.set_input("emission", emission_strength);
+    res.set_input("emission_color", emission);
+  }
+
+  return res;
+
+
+
+//
+//  MaterialX::Color3 default_white_color = MaterialX::Color3(1.0, 1.0, 1.0);
+//#pragma region get inputs
+//  const bNodeSocket base_color_socket = res->input_by_identifier("Base Color");
+//  const char *matx_input = "base_color";
+//  if (base_color_socket.link) {
+//    get_input_link_node(&base_color_socket, matx_node, matx_input);
+//  }
+//  else {
+//    const float *base_color = base_color_socket.default_value_typed<bNodeSocketValueRGBA>()->value;
+//    matx_node->addInput("base_color", "color3")
+//        ->setValue(MaterialX::Color3(base_color[0], base_color[1], base_color[2]));
+//  }
+//
+//  const float *base_color =
+//      res->input_by_identifier("Base Color").default_value_typed<bNodeSocketValueRGBA>()->value;
+//  const float subsurface =
+//      res->input_by_identifier("Subsurface").default_value_typed<bNodeSocketValueFloat>()->value;
+//
+//  const float *subsurface_radius = res->input_by_identifier("Subsurface Radius")
+//                                       .default_value_typed<bNodeSocketValueVector>()
+//                                       ->value;
+//  const float *subsurface_color = res->input_by_identifier("Subsurface Color")
+//                                      .default_value_typed<bNodeSocketValueRGBA>()
+//                                      ->value;
+//  const float metallic =
+//      res->input_by_identifier("Metallic").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float specular =
+//      res->input_by_identifier("Specular").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float roughness =
+//      res->input_by_identifier("Roughness").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float anisotropic =
+//      res->input_by_identifier("Anisotropic").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float anisotropic_rot = res->input_by_identifier("Anisotropic Rotation")
+//                                    .default_value_typed<bNodeSocketValueFloat>()
+//                                    ->value;
+//  const float sheen =
+//      res->input_by_identifier("Sheen").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float clearcoat =
+//      res->input_by_identifier("Clearcoat").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float clearcoat_roughness = res->input_by_identifier("Clearcoat Roughness")
+//                                        .default_value_typed<bNodeSocketValueFloat>()
+//                                        ->value;
+//  const float IOR =
+//      res->input_by_identifier("IOR").default_value_typed<bNodeSocketValueFloat>()->value;
+//  const float transmission = res->input_by_identifier("Transmission")
+//                                 .default_value_typed<bNodeSocketValueFloat>()
+//                                 ->value;
+//  const float *emission =
+//      res->input_by_identifier("Emission").default_value_typed<bNodeSocketValueRGBA>()->value;
+//  const float emission_str = res->input_by_identifier("Emission Strength")
+//                                 .default_value_typed<bNodeSocketValueFloat>()
+//                                 ->value;
+//  const float *normal =
+//      res->input_by_identifier("Normal").default_value_typed<bNodeSocketValueVector>()->value;
+//  const float *clearcoat_normal = res->input_by_identifier("Clearcoat Normal")
+//                                      .default_value_typed<bNodeSocketValueVector>()
+//                                      ->value;
+//  const float *tangent =
+//      res->input_by_identifier("Tangent").default_value_typed<bNodeSocketValueVector>()->value;
+//#pragma endregion get inputs
+//
+//#pragma region set inputs
+//  matx_node->addInput("base", "float")->setValue(1.0);
+//  matx_node->addInput("diffuse_roughness", "float")->setValue(roughness);
+//  matx_node->addInput("normal", "vector3")
+//      ->setValue(MaterialX::Vector3(normal[0], normal[1], normal[2]));
+//  matx_node->addInput("tangent", "vector3")
+//      ->setValue(MaterialX::Vector3(tangent[0], tangent[1], tangent[2]));
+//
+//  matx_node->addInput("metalness", "float")->setValue(metallic);
+//
+//  matx_node->addInput("specular", "float")->setValue(specular);
+//  matx_node->addInput("specular_color", "color3")->setValue(default_white_color);
+//  matx_node->addInput("specular_roughness", "float")->setValue(roughness);
+//  matx_node->addInput("specular_IOR", "float")->setValue(IOR);
+//  matx_node->addInput("specular_anisotropy", "float")->setValue(anisotropic);
+//  matx_node->addInput("specular_rotation", "float")->setValue(anisotropic_rot);
+//
+//  matx_node->addInput("transmission", "float")->setValue(transmission);
+//  matx_node->addInput("transmission_color", "color3")->setValue(default_white_color);
+//  matx_node->addInput("transmission_extra_roughness", "float")->setValue(roughness);
+//
+//  matx_node->addInput("subsurface", "float")->setValue(subsurface);
+//  matx_node->addInput("subsurface_color", "color3")
+//      ->setValue(MaterialX::Color3(subsurface_color[0], subsurface_color[1], subsurface_color[2]));
+//  matx_node->addInput("subsurface_radius", "color3")
+//      ->setValue(
+//          MaterialX::Color3(subsurface_radius[0], subsurface_radius[1], subsurface_radius[2]));
+//  matx_node->addInput("subsurface_anisotropy", "float")->setValue(anisotropic);
+//
+//  matx_node->addInput("sheen", "float")->setValue(sheen);
+//  matx_node->addInput("sheen_color", "color3")->setValue(default_white_color);
+//  matx_node->addInput("sheen_roughness", "float")->setValue(roughness);
+//
+//  matx_node->addInput("coat", "float")->setValue(clearcoat);
+//  matx_node->addInput("coat_color", "color3")->setValue(default_white_color);
+//  matx_node->addInput("coat_roughness", "float")->setValue(clearcoat_roughness);
+//  matx_node->addInput("coat_IOR", "float")->setValue(IOR);
+//  matx_node->addInput("coat_anisotropy", "float")->setValue(anisotropic);
+//  matx_node->addInput("coat_rotation", "float")->setValue(anisotropic_rot);
+//  matx_node->addInput("coat_normal", "vector3")
+//      ->setValue(
+//          MaterialX::Vector3(clearcoat_normal[0], clearcoat_normal[1], clearcoat_normal[2]));
+//
+//  matx_node->addInput("emission", "float")->setValue(emission_str);
+//  matx_node->addInput("emission_color", "color3")
+//      ->setValue(MaterialX::Color3(emission[0], emission[1], emission[2]));
+//#pragma endregion set inputs
+//  return matx_node;
 }
 
 }  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/node_parser.cc

@@ -16,13 +16,13 @@ NodeItem::NodeItem(MaterialX::GraphElement *graph)
 {
 }
 
-void NodeItem::set_input(const std::string &name, const NodeItem &item)
+void NodeItem::set_input(const std::string &name, const NodeItem &res)
 {
-  if (item.value) {
-    set_input(name, item.value);
+  if (res.value) {
+    set_input(name, res.value);
   }
   else {
-    set_input(name, item.node);
+    set_input(name, res.node);
   }
 }
 
@@ -66,47 +66,51 @@ NodeParser::NodeParser(MaterialX::GraphElement *graph,
 {
 }
 
-NodeItem NodeParser::create_node(const std::string &mx_category, const std::string &mx_type)
+NodeItem NodeParser::create_node(const std::string &mx_category, const std::string &mx_type, bool accessory)
 {
-  NodeItem item(graph);
-  item.node = graph->addNode(mx_category, MaterialX::createValidName(node->name), mx_type);
-  return item;
+  NodeItem res = empty_value();
+  res.node = graph->addNode(mx_category,
+                            accessory ? MaterialX::EMPTY_STRING :
+                                        MaterialX::createValidName(node->name),
+                            mx_type);
+  return res;
 }
 
 NodeItem NodeParser::get_input_default(const std::string &name)
 {
+  NodeItem res = empty_value();
+
   const bNodeSocket &socket = node->input_by_identifier(name);
-  NodeItem item(graph);
   switch (socket.type) {
     case SOCK_FLOAT: {
       float v = socket.default_value_typed<bNodeSocketValueFloat>()->value;
-      item.value = MaterialX::Value::createValue<float>(v);
+      res.value = MaterialX::Value::createValue<float>(v);
     } break;
     case SOCK_VECTOR: {
       const float *v = socket.default_value_typed<bNodeSocketValueVector>()->value;
-      item.value = MaterialX::Value::createValue<MaterialX::Vector3>(
+      res.value = MaterialX::Value::createValue<MaterialX::Vector3>(
           MaterialX::Vector3(v[0], v[1], v[2]));
     } break;
     case SOCK_RGBA: {
       const float *v = socket.default_value_typed<bNodeSocketValueRGBA>()->value;
-      item.value = MaterialX::Value::createValue<MaterialX::Color4>(
+      res.value = MaterialX::Value::createValue<MaterialX::Color4>(
           MaterialX::Color4(v[0], v[1], v[2], v[3]));
     } break;
     default: {
       // TODO log warn
     }
   }
-  return item;
+  return res;
 }
 
 
 NodeItem NodeParser::get_input_link(const std::string &name)
 {
-  NodeItem item(graph);
+  NodeItem res = empty_value();
 
   const bNodeLink *link = node->input_by_identifier(name).link;
   if (!link->is_used()) {
-    return item;
+    return res;
   }
 
   const bNode *in_node = link->fromnode;
@@ -115,7 +119,7 @@ NodeItem NodeParser::get_input_link(const std::string &name)
   while (in_node->type == NODE_REROUTE) {
     link = in_node->input_socket(0).link;
     if (!link->is_used()) {
-      return item;
+      return res;
     }
     in_node = link->fromnode;
   }
@@ -131,20 +135,25 @@ NodeItem NodeParser::get_input_link(const std::string &name)
       break;
     default:
       // TODO: warning log
-      return item;
+      return res;
   }
 
-  item = parser->compute();
-  return item;
+  res = parser->compute();
+  return res;
 }
 
 NodeItem NodeParser::get_input_value(const std::string &name)
 {
-  NodeItem item = get_input_link(name);
-  if (!item) {
-    item = get_input_value(name);
+  NodeItem res = get_input_link(name);
+  if (!res) {
+    res = get_input_value(name);
   }
-  return item;
+  return res;
+}
+
+NodeItem NodeParser::empty_value()
+{
+  return NodeItem(graph);
 }
 
 std::string NodeParser::get_mx_type(const bNodeSocket *sock)

source/blender/nodes/shader/materialx/nodes/node_parser.h

@@ -56,10 +56,13 @@ class NodeParser {
   virtual NodeItem compute() = 0;
 
  protected:
-  NodeItem create_node(const std::string &mx_category, const std::string &mx_type);
+  NodeItem create_node(const std::string &mx_category,
+                       const std::string &mx_type,
+                       bool accessory = false);
   NodeItem get_input_default(const std::string &name);
   NodeItem get_input_link(const std::string &name);
   NodeItem get_input_value(const std::string &name);
+  NodeItem empty_value();
 
   std::string get_mx_type(const bNodeSocket *sock);
 };

source/blender/nodes/shader/materialx/nodes/output_material.cc

@@ -6,21 +6,15 @@
 
 namespace blender::nodes::materialx {
 
-OutputMaterialNodeParser::OutputMaterialNodeParser(MaterialX::DocumentPtr doc,
-                                                   const Depsgraph *depsgraph,
-                                                   const Material *material,
-                                                   const bNode *node)
-    : NodeParser(doc, depsgraph, material, node)
+NodeItem OutputMaterialNodeParser::compute()
 {
-  matx_node = doc->addNode("surfacematerial", MaterialX::createValidName(node->name), "material");
-}
-
-MaterialX::NodePtr OutputMaterialNodeParser::compute()
-{
-  const char *matx_socket = "surfaceshader";
-  const bNodeSocket sock = node->input_by_identifier("Surface");
-  get_input_link_node(&sock, matx_node, matx_socket);
-  return matx_node;
+  NodeItem node = empty_value();
+  NodeItem surface = get_input_link("Surface");
+  if (surface) {
+    node = create_node("surfacematerial", "material");
+    node.set_input("surfaceshader", surface);
+  }
+  return node;
 }
 
 }  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/output_material.h

@@ -10,11 +10,8 @@ namespace blender::nodes::materialx {
 
 class OutputMaterialNodeParser : public NodeParser {
  public:
-  OutputMaterialNodeParser(MaterialX::DocumentPtr doc,
-                           const Depsgraph *depsgraph,
-                           const Material *material,
-                           const bNode *node);
-  MaterialX::NodePtr compute() override;
+  using NodeParser::NodeParser;
+  NodeItem compute() override;
 };
 
 }  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/tex_image.cc

@@ -11,18 +11,8 @@
 
 namespace blender::nodes::materialx {
 
-const MaterialX::Color3 TexImageNodeParser::texture_error_color_{1.0, 0.0, 1.0};
 
-TexImageNodeParser::TexImageNodeParser(MaterialX::DocumentPtr doc,
-                                       const Depsgraph *depsgraph,
-                                       const Material *material,
-                                       const bNode *node)
-    : NodeParser(doc, depsgraph, material, node)
-{
-  matx_node = doc->addNode("image", MaterialX::createValidName(node->name), "color3");
-}
-
-MaterialX::NodePtr TexImageNodeParser::compute()
+NodeItem TexImageNodeParser::compute()
 {
   Image *image = (Image *)node->id;
   NodeTexImage *tex = static_cast<NodeTexImage *>(node->storage);
@@ -34,12 +24,12 @@ MaterialX::NodePtr TexImageNodeParser::compute()
 #ifdef WITH_HYDRA
   image_path = io::hydra::cache_or_get_image_file(bmain, scene, image, &tex->iuser);
 #endif
-  MaterialX::NodePtr uv_node = doc->addNode("texcoord", MaterialX::EMPTY_STRING, "vector2");
 
-  matx_node->addInput("file", "filename")->setValue(image_path);
-  matx_node->addInput("texcoord", "vector2")->setNodeName(uv_node->getName());
-
-  return matx_node;
+  NodeItem texcoord = create_node("texcoord", "vector2", true);
+  NodeItem res = create_node("image", "color3");
+  res.set_input("file", image_path, "filename");
+  res.set_input("texcoord", texcoord);
+  return res;
 }
 
 }  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/tex_image.h

@@ -9,16 +9,9 @@
 namespace blender::nodes::materialx {
 
 class TexImageNodeParser : public NodeParser {
- protected:
-  /* Following Cycles color for wrong Texture nodes. */
-  static const MaterialX::Color3 texture_error_color_;
-
  public:
-  TexImageNodeParser(MaterialX::DocumentPtr doc,
-                     const Depsgraph *depsgraph,
-                     const Material *material,
-                     const bNode *node);
-  MaterialX::NodePtr compute() override;
+  using NodeParser::NodeParser;
+  NodeItem compute() override;
 };
 
 }  // namespace blender::nodes::materialx