source/blender/nodes/shader/CMakeLists.txt

@@ -147,6 +147,7 @@ set(LIB
 if(WITH_MATERIALX)
   list(APPEND SRC
     materialx/material.cc
+    materialx/nodes/blackbody.cc
     materialx/nodes/brightness.cc
     materialx/nodes/bsdf_principled.cc
     materialx/nodes/huesatval.cc

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

@@ -0,0 +1,22 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "node_parser.h"
+
+namespace blender::nodes::materialx {
+
+NodeItem BlackbodyNodeParser::compute()
+{
+  /* This node doesn't have an implementation in MaterialX 1.38.6.
+   * It's added in MaterialX 1.38.8. Uncomment this code after switching to 1.38.8.
+   * 
+   * NodeItem temperature = get_input_value("Temperature", NodeItem::Type::Float);
+
+   * NodeItem res = create_node("blackbody", "color3");
+   * res.set_input("temperature", temperature);
+   * return res; */
+  return empty();
+}
+
+}  // namespace blender::nodes::materialx

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

@@ -132,6 +132,7 @@ NodeItem NodeParser::get_input_link(const bNodeSocket &socket)
     break;
 
   switch (from_node->typeinfo->type) {
+    CASE_NODE_TYPE(SH_NODE_BLACKBODY, BlackbodyNodeParser)
     CASE_NODE_TYPE(SH_NODE_BRIGHTCONTRAST, BrightContrastNodeParser)
     CASE_NODE_TYPE(SH_NODE_BSDF_PRINCIPLED, BSDFPrincipledNodeParser)
     CASE_NODE_TYPE(SH_NODE_COMBINE_COLOR, CombineColorNodeParser)

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

@@ -63,6 +63,7 @@ template<class T> NodeItem NodeParser::value(const T &data) const
     NodeItem compute() override; \
   };
 
+DECLARE_PARSER(BlackbodyNodeParser)
 DECLARE_PARSER(BrightContrastNodeParser)
 DECLARE_PARSER(BSDFPrincipledNodeParser)
 DECLARE_PARSER(CombineColorNodeParser)