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

@@ -13,7 +13,7 @@ NodeItem BlackbodyNodeParser::compute()
    * 
    * NodeItem temperature = get_input_value("Temperature", NodeItem::Type::Float);
 
-   * NodeItem res = create_node("blackbody", "color3");
+   * NodeItem res = create_node("blackbody", NodeItem::Type::Color3);
    * res.set_input("temperature", temperature);
    * return res; */
   return empty();

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

@@ -147,6 +147,7 @@ NodeItem NodeParser::get_input_link(const bNodeSocket &socket, NodeItem::Type to
     CASE_NODE_TYPE(SH_NODE_MATH, MathNodeParser)
     CASE_NODE_TYPE(SH_NODE_MIX_RGB_LEGACY, MixRGBNodeParser)
     CASE_NODE_TYPE(SH_NODE_NORMAL_MAP, NormalMapNodeParser)
+    CASE_NODE_TYPE(SH_NODE_RGBTOBW, RGBToBWNodeParser)
     CASE_NODE_TYPE(SH_NODE_SEPARATE_COLOR, SeparateColorNodeParser)
     CASE_NODE_TYPE(SH_NODE_SEPXYZ, SeparateXYZNodeParser)
     CASE_NODE_TYPE(SH_NODE_TEX_CHECKER, TexCheckerNodeParser)

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

@@ -101,6 +101,7 @@ DECLARE_NODE_PARSER(MapRangeNodeParser)
 DECLARE_NODE_PARSER(MathNodeParser)
 DECLARE_NODE_PARSER(MixRGBNodeParser)
 DECLARE_NODE_PARSER(NormalMapNodeParser)
+DECLARE_NODE_PARSER(RGBToBWNodeParser)
 DECLARE_NODE_PARSER(SeparateColorNodeParser)
 DECLARE_NODE_PARSER(SeparateXYZNodeParser)
 DECLARE_NODE_PARSER(TexCheckerNodeParser)

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

@@ -0,0 +1,18 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "node_parser.h"
+
+namespace blender::nodes::materialx {
+
+NodeItem RGBToBWNodeParser::compute()
+{
+  NodeItem color = get_input_value("Color", NodeItem::Type::Color3);
+
+  NodeItem res = create_node("luminance", NodeItem::Type::Color3);
+  res.set_input("in", color);
+  return res; 
+}
+
+}  // namespace blender::nodes::materialx