1 files changed, 75 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_material_replace.cc b/source/blender/nodes/geometry/nodes/node_geo_material_replace.cc
new file mode 100644
index 00000000000..40ecab98dea
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_material_replace.cc
@@ -0,0 +1,75 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "node_geometry_util.hh"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+
+#include "BKE_material.h"
+
+static bNodeSocketTemplate geo_node_material_replace_in[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {SOCK_MATERIAL, N_("Old")},
+    {SOCK_MATERIAL, N_("New")},
+    {-1, ""},
+};
+
+static bNodeSocketTemplate geo_node_material_replace_out[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {-1, ""},
+};
+
+namespace blender::nodes {
+
+static void geo_node_material_replace_exec(GeoNodeExecParams params)
+{
+  Material *old_material = params.extract_input<Material *>("Old");
+  Material *new_material = params.extract_input<Material *>("New");
+
+  GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
+  geometry_set = geometry_set_realize_instances(geometry_set);
+
+  if (geometry_set.has<MeshComponent>()) {
+    MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
+    Mesh *mesh = mesh_component.get_for_write();
+    if (mesh != nullptr) {
+      for (const int i : IndexRange(mesh->totcol)) {
+        if (mesh->mat[i] == old_material) {
+          mesh->mat[i] = new_material;
+        }
+      }
+    }
+  }
+
+  params.set_output("Geometry", std::move(geometry_set));
+}
+
+}  // namespace blender::nodes
+
+void register_node_type_geo_material_replace()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(
+      &ntype, GEO_NODE_MATERIAL_REPLACE, "Material Replace", NODE_CLASS_GEOMETRY, 0);
+  node_type_socket_templates(&ntype, geo_node_material_replace_in, geo_node_material_replace_out);
+  ntype.geometry_node_execute = blender::nodes::geo_node_material_replace_exec;
+  nodeRegisterType(&ntype);
+}