Fix T37978: cycles nodes with multiple Material Output nodes not predictable.

Now it uses the last activated node like compositing does. This should have no
effect on existing files until you activate another output node there.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 08b86b574b0..b6a031f527f 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -3162,6 +3162,16 @@ static void def_texture(StructRNA *srna)
 
 /* -- Shader Nodes ---------------------------------------------------------- */
 
+static void def_sh_output(StructRNA *srna)
+{
+	PropertyRNA *prop;
+	
+	prop = RNA_def_property(srna, "is_active_output", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", NODE_DO_OUTPUT);
+	RNA_def_property_ui_text(prop, "Active Output", "True if this node is used as the active output");
+	RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
+}
+
 static void def_sh_material(StructRNA *srna)
 {
 	PropertyRNA *prop;