Geometry Nodes: Add default attribute name to field inputs/outputs

Geometry node group inputs and outputs get a new property that controls
the attribute name used for that field input/output when assigning the
node group to a modifier for the first time. If the default name is assigned
to an input, the default "Use attribute name" is true .

In order to properly detect when a node group is first assigned,
the modifier now clears its properties when clearing the node group.

Ref T96707

Differential Revision: https://developer.blender.org/D14761

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 4195782db08..4d68330c84d 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -10890,6 +10890,14 @@ static void rna_def_node_socket_interface(BlenderRNA *brna)
       "Attribute domain used by the geometry nodes modifier to create an attribute output");
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
 
+  prop = RNA_def_property(srna, "default_attribute_name", PROP_STRING, PROP_NONE);
+  RNA_def_property_string_sdna(prop, NULL, "default_attribute_name");
+  RNA_def_property_ui_text(prop,
+                           "Default Attribute",
+                           "The attribute name used by default when the node group is used by a "
+                           "geometry nodes modifier");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
+
   /* registration */
   prop = RNA_def_property(srna, "bl_socket_idname", PROP_STRING, PROP_NONE);
   RNA_def_property_string_sdna(prop, NULL, "typeinfo->idname");