add unchanged in mappings

Author: panquez

include/geode/model/representation/core/mapping.hpp

@@ -98,6 +98,8 @@ namespace geode
 
     using ModelAddedComponentMapping = ModelMapping< std::vector< uuid > >;
 
+    using ModelUnchangedComponentMapping = ModelMapping< std::vector< uuid > >;
+
     using MeshElementMapping = GenericMapping< MeshElement, MeshElement >;
 
     using MeshVertexMapping = GenericMapping< MeshVertex, MeshVertex >;
@@ -143,7 +145,8 @@ namespace geode
     struct ModelMappings
     {
         ModelGenericMapping component_mapping;
-        ModelAddedComponentMapping added_component;
+        ModelAddedComponentMapping added_components;
+        ModelUnchangedComponentMapping unchanged_components;
         ModelMeshesElementMapping mesh_element_mapping;
         ModelMeshesVertexMapping mesh_vertices_mapping;
     };

src/geode/mesh/core/graph.cpp

@@ -201,7 +201,8 @@ namespace geode
         index_t vertex_id ) const
     {
         OPENGEODE_ASSERT( vertex_id < this->nb_vertices(),
-            "[Graph::edges_around_vertex] Accessing an invalid vertex" );
+            "[Graph::edges_around_vertex] Accessing an invalid vertex (",
+            vertex_id, " but nb_vertices = ", this->nb_vertices(), ")" );
         return impl_->edges_around_vertex( vertex_id );
     }
 
@@ -243,7 +244,8 @@ namespace geode
         index_t vertex_id, EdgesAroundVertex edges, GraphKey )
     {
         OPENGEODE_ASSERT( vertex_id < this->nb_vertices(),
-            "[Graph::get_edges_around_vertex] Accessing an invalid vertex" );
+            "[Graph::edges_around_vertex] Accessing an invalid vertex (",
+            vertex_id, " but nb_vertices = ", this->nb_vertices(), ")" );
         return impl_->set_edges_around_vertex( vertex_id, std::move( edges ) );
     }