source/blender/editors/space_node/drawnode.cc

@@ -1465,6 +1465,11 @@ static void std_node_socket_interface_draw(bContext * /*C*/, uiLayout *layout, P
   }
 
   uiItemR(layout, ptr, "hide_value", DEFAULT_FLAGS, nullptr, 0);
+
+  const bNodeTree *node_tree = reinterpret_cast<const bNodeTree *>(ptr->owner_id);
+  if (sock->in_out == SOCK_IN && node_tree->type == NTREE_GEOMETRY) {
+    uiItemR(col, ptr, "hide_in_modifier", DEFAULT_FLAGS, nullptr, 0);
+  }
 }
 
 static void node_socket_virtual_draw_color(bContext * /*C*/,

source/blender/makesdna/DNA_node_types.h

@@ -282,6 +282,10 @@ typedef enum eNodeSocketFlag {
    * type is obvious and the name takes up too much space.
    */
   SOCK_HIDE_LABEL = (1 << 12),
+  /**
+   * Only used for geometry nodes. Don't show the socket value in the modifier interface.
+   */
+  SOCK_HIDE_IN_MODIFIER = (1 << 13),
 } eNodeSocketFlag;
 
 typedef struct bNode {

source/blender/makesrna/intern/rna_nodetree.c

@@ -11219,6 +11219,14 @@ static void rna_def_node_socket_interface(BlenderRNA *brna)
       prop, "Hide Value", "Hide the socket input value even when the socket is not connected");
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
 
+  prop = RNA_def_property(srna, "hide_in_modifier", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "flag", SOCK_HIDE_IN_MODIFIER);
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_ui_text(prop,
+                           "Hide in Modifier",
+                           "Don't show the input value in the geometry nodes modifier interface");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
+
   prop = RNA_def_property(srna, "attribute_domain", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_items(prop, rna_enum_attribute_domain_items);
   RNA_def_property_ui_text(

source/blender/modifiers/intern/MOD_nodes.cc

@@ -1736,7 +1736,9 @@ static void panel_draw(const bContext *C, Panel *panel)
 
     int socket_index;
     LISTBASE_FOREACH_INDEX (bNodeSocket *, socket, &nmd->node_group->inputs, socket_index) {
-      draw_property_for_socket(*C, layout, nmd, &bmain_ptr, ptr, *socket, socket_index);
+      if (!(socket->flag & SOCK_HIDE_IN_MODIFIER)) {
+        draw_property_for_socket(*C, layout, nmd, &bmain_ptr, ptr, *socket, socket_index);
+      }
     }
   }