diff --git a/.gitignore b/.gitignore
index 1553f7c..b6f9cc2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.o
 *.obj
 CMakePresets.json
 build/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 568b6c6..7d199cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,8 @@ message(STATUS "SCons: ${SCONS_PROGRAM}")
 
 if(WIN32)
     set(GODOT_PLATFORM "windows")
+elseif(APPLE)
+    set(GODOT_PLATFORM "macos")
 else()
     set(GODOT_PLATFORM "linuxbsd")
 endif()
diff --git a/README.md b/README.md
index f5cf389..cab77b7 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,11 @@
 * Python >= 3.6
 * SCons >= 4.5.2
 
+
+On MacOS, you will also need two other things
+ * MoltenVK (follow [Godot instructions](https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_macos.html)
+ * llvm-ar (I used homebrew's llvm).
+
 #### Test Prerequisites
 
 * Catch2 >= 2.13.8
@@ -50,6 +55,12 @@ cmake -E make_directory build
 cmake -B build -S .
 ```
 
+On MacOS, you need to direct CMake to use your llvm-ar, perhaps like this:
+
+```
+cmake -DCMAKE_AR=/opt/homebrew/opt/llvm/bin/llvm-ar -B build -S .
+```
+
 5. Build the project's extended version of Godot >= 4.2 e.g.
 
 ```
@@ -64,6 +75,8 @@ Launch the project's extended version of Godot >= 4.2 e.g.
 godot\bin\godot.windows.editor.x86_64.exe
 ```
 
+(On other platforms, the binary name will be slightly different.)
+
 ## Roadmap
 
 ## License
diff --git a/godot b/godot
index b09f793..15073af 160000
--- a/godot
+++ b/godot
@@ -1 +1 @@
-Subproject commit b09f793f564a6c95dc76acc654b390e68441bd01
+Subproject commit 15073afe3856abd2aa1622492fe50026c7d63dc1
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_declaration.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_declaration.hpp
index 9fe6434..d9bbdf8 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_declaration.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_declaration.hpp
@@ -70,7 +70,7 @@ struct ClassDeclaration : public std::variant<std::monostate, Definition, Declar
     ClassDeclaration& operator=(ClassDeclaration const&) = delete;
 
     ClassDeclaration(ClassDeclaration&&) = default;
-    ClassDeclaration& operator=(ClassDeclaration&&) = default;
+    ClassDeclaration& operator=(ClassDeclaration&&) = delete;
 
     /// \note An inlined destructor can't delete incomplete types.
     ~ClassDeclaration();
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_definition.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_definition.hpp
index f056a5e..f31de0a 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_definition.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/class_definition.hpp
@@ -76,7 +76,7 @@ class ClassDefinition : public Node {
 
     ClassDefinition& operator=(ClassDefinition const&) = delete;
 
-    ClassDefinition& operator=(ClassDefinition&&) = default;
+    ClassDefinition& operator=(ClassDefinition&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/declaration.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/declaration.hpp
index 1d58634..7ba1edf 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/declaration.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/declaration.hpp
@@ -76,7 +76,7 @@ class Declaration : public Node {
 
     Declaration& operator=(Declaration const&) = delete;
 
-    Declaration& operator=(Declaration&&) = default;
+    Declaration& operator=(Declaration&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition.hpp
index 7b2b3f3..409c1d7 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition.hpp
@@ -80,7 +80,7 @@ class Definition : public Node {
 
     Definition& operator=(Definition const&) = delete;
 
-    Definition& operator=(Definition&&) = default;
+    Definition& operator=(Definition&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition_statement.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition_statement.hpp
index e465f6d..ef3c35f 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition_statement.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/definition_statement.hpp
@@ -69,8 +69,8 @@ struct DefinitionStatement : public std::variant<std::monostate, Statement, Decl
     DefinitionStatement(DefinitionStatement const&) = delete;
     DefinitionStatement& operator=(DefinitionStatement const&) = delete;
 
-    DefinitionStatement(DefinitionStatement&&) = default;
-    DefinitionStatement& operator=(DefinitionStatement&&) = default;
+    DefinitionStatement(DefinitionStatement&&) = delete;
+    DefinitionStatement& operator=(DefinitionStatement&&) = delete;
 
     /// \note An inlined destructor can't delete incomplete types.
     ~DefinitionStatement();
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/external_reference.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/external_reference.hpp
index 69af2a6..0dce1bf 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/external_reference.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/external_reference.hpp
@@ -66,7 +66,7 @@ class ExternalReference : public Node {
     /// \throws std::invalid_argument
     ExternalReference(AMdoc const* const document, AMitem const* const map_object);
 
-    ExternalReference(ExternalReference const&) = default;
+    ExternalReference(ExternalReference const&) = delete;
 
     ExternalReference& operator=(ExternalReference const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/file.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/file.hpp
index 8859107..16599c7 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/file.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/file.hpp
@@ -71,7 +71,7 @@ class File : public Node {
     /// \throws std::invalid_argument
     File(AMdoc const* const document, AMitem const* const map_object = nullptr);
 
-    File(File const&) = default;
+    File(File const&) = delete;
 
     File& operator=(File const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/node.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/node.hpp
index 604c396..af0cde3 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/node.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/node.hpp
@@ -106,7 +106,7 @@ class Node {
 
     Node(Node&&) = default;
 
-    Node& operator=(Node&&) = default;
+    Node& operator=(Node&&) = delete;
 
     /// \brief Checks that the enum property under a given key matches the given
     ///        tag value.
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/number.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/number.hpp
index d67db47..11a737f 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/number.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/number.hpp
@@ -63,7 +63,7 @@ struct Number : public std::variant<double,        // AM_VAL_TYPE_F64
     Number& operator=(Number const&) = delete;
 
     Number(Number&&) = default;
-    Number& operator=(Number&&) = default;
+    Number& operator=(Number&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration.hpp
index 2864c10..b50633a 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration.hpp
@@ -76,11 +76,11 @@ class ObjectDeclaration : public Node {
 
     ObjectDeclaration(ObjectDeclaration const&) = delete;
 
-    ObjectDeclaration(ObjectDeclaration&&) = default;
+    ObjectDeclaration(ObjectDeclaration&&) = delete;
 
     ObjectDeclaration& operator=(ObjectDeclaration const&) = delete;
 
-    ObjectDeclaration& operator=(ObjectDeclaration&&) = default;
+    ObjectDeclaration& operator=(ObjectDeclaration&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_entries.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_entries.hpp
index c4b327e..fac3801 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_entries.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_entries.hpp
@@ -70,7 +70,7 @@ class ObjectDeclarationEntries : public Node {
 
     ObjectDeclarationEntries& operator=(ObjectDeclarationEntries const&) = delete;
 
-    ObjectDeclarationEntries& operator=(ObjectDeclarationEntries&&) = default;
+    ObjectDeclarationEntries& operator=(ObjectDeclarationEntries&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list.hpp
index 93785e1..85eeed6 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list.hpp
@@ -69,11 +69,11 @@ class ObjectDeclarationList : public Node {
 
     ObjectDeclarationList(ObjectDeclarationList const&) = delete;
 
-    ObjectDeclarationList(ObjectDeclarationList&&) = default;
+    ObjectDeclarationList(ObjectDeclarationList&&) = delete;
 
     ObjectDeclarationList& operator=(ObjectDeclarationList const&) = delete;
 
-    ObjectDeclarationList& operator=(ObjectDeclarationList&&) = default;
+    ObjectDeclarationList& operator=(ObjectDeclarationList&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list_value.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list_value.hpp
index 82c137f..9b3ad86 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list_value.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declaration_list_value.hpp
@@ -66,11 +66,11 @@ class ObjectDeclarationListValue : public Node {
 
     ObjectDeclarationListValue(ObjectDeclarationListValue const&) = delete;
 
-    ObjectDeclarationListValue(ObjectDeclarationListValue&&) = default;
+    ObjectDeclarationListValue(ObjectDeclarationListValue&&) = delete;
 
     ObjectDeclarationListValue& operator=(ObjectDeclarationListValue const&) = delete;
 
-    ObjectDeclarationListValue& operator=(ObjectDeclarationListValue&&) = default;
+    ObjectDeclarationListValue& operator=(ObjectDeclarationListValue&&) = delete;
 
     /// \brief Accepts a visitor that can only read this node.
     ///
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declarations.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declarations.hpp
index e181b7a..37d9704 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declarations.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_declarations.hpp
@@ -75,8 +75,8 @@ struct ObjectDeclarations : public std::variant<std::monostate, ObjectDeclaratio
     ObjectDeclarations(ObjectDeclarations const&) = delete;
     ObjectDeclarations& operator=(ObjectDeclarations const&) = delete;
 
-    ObjectDeclarations(ObjectDeclarations&&) = default;
-    ObjectDeclarations& operator=(ObjectDeclarations&&) = default;
+    ObjectDeclarations(ObjectDeclarations&&) = delete;
+    ObjectDeclarations& operator=(ObjectDeclarations&&) = delete;
 
     /// \note An inlined destructor can't delete incomplete types.
     ~ObjectDeclarations();
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_value.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_value.hpp
index e729f49..82490dc 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_value.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/object_value.hpp
@@ -60,7 +60,7 @@ class ObjectValue : public Node {
     /// \throws std::invalid_argument
     ObjectValue(AMdoc const* const document, AMitem const* const map_object);
 
-    ObjectValue(ObjectValue const&) = default;
+    ObjectValue(ObjectValue const&) = delete;
 
     ObjectValue& operator=(ObjectValue const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/reference_file.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/reference_file.hpp
index d85b367..659bd6b 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/reference_file.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/reference_file.hpp
@@ -65,7 +65,7 @@ class ReferenceFile : public Node {
     /// \throws std::invalid_argument
     ReferenceFile(AMdoc const* const document, AMitem const* const map_object);
 
-    ReferenceFile(ReferenceFile const&) = default;
+    ReferenceFile(ReferenceFile const&) = delete;
 
     ReferenceFile& operator=(ReferenceFile const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/statement.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/statement.hpp
index 3dd8c78..182faa1 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/statement.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/statement.hpp
@@ -71,8 +71,8 @@ struct Statement : public std::variant<std::monostate, ClassDefinition, Definiti
     Statement(Statement const&) = delete;
     Statement& operator=(Statement const&) = delete;
 
-    Statement(Statement&&) = default;
-    Statement& operator=(Statement&&) = default;
+    Statement(Statement&&) = delete;
+    Statement& operator=(Statement&&) = delete;
 
     /// \note An inlined destructor can't delete incomplete types.
     ~Statement();
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/document.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/document.hpp
index 7427a16..3175ec6 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/document.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/document.hpp
@@ -79,7 +79,7 @@ class Document {
     Document& operator=(Document const&) = delete;
 
     Document(Document&&) = default;
-    Document& operator=(Document&&) = default;
+    Document& operator=(Document&&) = delete;
 
     operator AMdoc*() const;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/item.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/item.hpp
index b3e858a..14e1c96 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/item.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/item.hpp
@@ -60,9 +60,9 @@ class Item {
 
     Item(Item&&) = default;
 
-    Item& operator=(Item const&) = default;
+    Item& operator=(Item const&) = delete;
 
-    Item& operator=(Item&&) = default;
+    Item& operator=(Item&&) = delete;
 
     operator AMitem const*() const;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/json_writer.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/json_writer.hpp
index 834aa3d..c61b27e 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/json_writer.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/utils/json_writer.hpp
@@ -55,7 +55,7 @@ class JsonWriter : public Visitor {
 
         Indenter(Indenter&&) = default;
 
-        Indenter& operator=(Indenter const&) = default;
+        Indenter& operator=(Indenter const&) = delete;
 
         Indenter& operator=(Indenter&&) = delete;
 
@@ -93,7 +93,7 @@ class JsonWriter : public Visitor {
 
     JsonWriter& operator=(JsonWriter const&) = delete;
 
-    JsonWriter& operator=(JsonWriter&&) = default;
+    JsonWriter& operator=(JsonWriter&&) = delete;
 
     operator std::string() const;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/value.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/value.hpp
index 846d670..65d2222 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/value.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/value.hpp
@@ -104,8 +104,8 @@ struct Value : public std::variant<std::monostate,  // undefined
     Value(Value const&) = delete;
     Value& operator=(Value const&) = delete;
 
-    Value(Value&&) = default;
-    Value& operator=(Value&&) = default;
+    Value(Value&&) = delete;
+    Value& operator=(Value&&) = delete;
 
     /// \note An inlined destructor can't delete incomplete types.
     ~Value();
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_definition.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_definition.hpp
index 7897882..28fe5a1 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_definition.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_definition.hpp
@@ -75,7 +75,7 @@ class VariantDefinition : public Node {
     /// \throws std::invalid_argument
     VariantDefinition(AMdoc const* const document, AMitem const* const map_object);
 
-    VariantDefinition(VariantDefinition const&) = default;
+    VariantDefinition(VariantDefinition const&) = delete;
 
     VariantDefinition& operator=(VariantDefinition const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_set.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_set.hpp
index 628f865..7b5825f 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_set.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/variant_set.hpp
@@ -68,7 +68,7 @@ class VariantSet : public Node {
     /// \throws std::invalid_argument
     VariantSet(AMdoc const* const document, AMitem const* const map_object);
 
-    VariantSet(VariantSet const&) = default;
+    VariantSet(VariantSet const&) = delete;
 
     VariantSet& operator=(VariantSet const&) = delete;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/visitor.hpp b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/visitor.hpp
index 6baf316..94fca69 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/visitor.hpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/include/cavi/usdj_am/visitor.hpp
@@ -64,7 +64,7 @@ class Visitor {
 
     Visitor& operator=(Visitor const&) = delete;
 
-    Visitor& operator=(Visitor&&) = default;
+    Visitor& operator=(Visitor&&) = delete;
 
     virtual ~Visitor() = 0;
 
diff --git a/modules/reality_merge/thirdparty/cavi_usdj-am/src/utils/item.cpp b/modules/reality_merge/thirdparty/cavi_usdj-am/src/utils/item.cpp
index c1c0ff7..d7b0c93 100644
--- a/modules/reality_merge/thirdparty/cavi_usdj-am/src/utils/item.cpp
+++ b/modules/reality_merge/thirdparty/cavi_usdj-am/src/utils/item.cpp
@@ -147,7 +147,7 @@ Item operator/(Item const& lhs, std::uint64_t const pos) {
 
 std::ostream& operator<<(std::ostream& os, Item const& in) {
     AMbyteSpan key;
-    std::uint64_t pos;
+    size_t pos;
     // The root of a document is a map object.
     AMvalType val_type = AM_VAL_TYPE_OBJ_TYPE;
     auto const fmtflags = os.flags();
@@ -158,7 +158,7 @@ std::ostream& operator<<(std::ostream& os, Item const& in) {
         AMitem const* const c_item = AMresultItem(result.get());
         if (AMitemKey(c_item, &key)) {
             os << "\"" << from_bytes(key) << "\"";
-        } else if (AMitemPos(c_item, &pos)) {
+        } else if (AMitemPos(c_item, reinterpret_cast<size_t*>(&pos))) {
             os << pos;
         }
         val_type = AMitemValType(c_item);
diff --git a/modules/reality_merge/usdj_body_updater.h b/modules/reality_merge/usdj_body_updater.h
index 1a108e4..199a26b 100644
--- a/modules/reality_merge/usdj_body_updater.h
+++ b/modules/reality_merge/usdj_body_updater.h
@@ -75,13 +75,13 @@ class UsdjBodyUpdater : public cavi::usdj_am::Visitor {
 
     UsdjBodyUpdater(UsdjBodyUpdater const&) = delete;
 
-    UsdjBodyUpdater(UsdjBodyUpdater&&) = default;
+    UsdjBodyUpdater(UsdjBodyUpdater&&) = delete;
 
     ~UsdjBodyUpdater();
 
     UsdjBodyUpdater& operator=(UsdjBodyUpdater const&) = delete;
 
-    UsdjBodyUpdater& operator=(UsdjBodyUpdater&&) = default;
+    UsdjBodyUpdater& operator=(UsdjBodyUpdater&&) = delete;
 
     /// \brief Creates new physics bodies and sorts pre-existing ones into
     ///        categories of forgotten, kept and removed.
diff --git a/modules/reality_merge/usdj_box_size_extractor.h b/modules/reality_merge/usdj_box_size_extractor.h
index 367bfc6..5a74109 100644
--- a/modules/reality_merge/usdj_box_size_extractor.h
+++ b/modules/reality_merge/usdj_box_size_extractor.h
@@ -54,7 +54,7 @@ class UsdjBoxSizeExtractor : public cavi::usdj_am::Visitor {
 
     UsdjBoxSizeExtractor& operator=(UsdjBoxSizeExtractor const&) = delete;
 
-    UsdjBoxSizeExtractor& operator=(UsdjBoxSizeExtractor&&) = default;
+    UsdjBoxSizeExtractor& operator=(UsdjBoxSizeExtractor&&) = delete;
 
     std::optional<Vector3> operator()();
 
diff --git a/modules/reality_merge/usdj_color_extractor.h b/modules/reality_merge/usdj_color_extractor.h
index c618bfb..dc6aae6 100644
--- a/modules/reality_merge/usdj_color_extractor.h
+++ b/modules/reality_merge/usdj_color_extractor.h
@@ -55,7 +55,7 @@ class UsdjColorExtractor : public cavi::usdj_am::Visitor {
 
     UsdjColorExtractor& operator=(UsdjColorExtractor const&) = delete;
 
-    UsdjColorExtractor& operator=(UsdjColorExtractor&&) = default;
+    UsdjColorExtractor& operator=(UsdjColorExtractor&&) = delete;
 
     std::optional<Color> operator()();
 
diff --git a/modules/reality_merge/usdj_geometry_extractor.h b/modules/reality_merge/usdj_geometry_extractor.h
index 7869dbd..da2e261 100644
--- a/modules/reality_merge/usdj_geometry_extractor.h
+++ b/modules/reality_merge/usdj_geometry_extractor.h
@@ -65,7 +65,7 @@ class UsdjGeometryExtractor : public cavi::usdj_am::Visitor {
 
     UsdjGeometryExtractor& operator=(UsdjGeometryExtractor const&) = delete;
 
-    UsdjGeometryExtractor& operator=(UsdjGeometryExtractor&&) = default;
+    UsdjGeometryExtractor& operator=(UsdjGeometryExtractor&&) = delete;
 
     std::pair<MeshPtr, Shape3dPtr> operator()();
 
diff --git a/modules/reality_merge/usdj_static_body_3d.h b/modules/reality_merge/usdj_static_body_3d.h
index ef83321..694cf10 100644
--- a/modules/reality_merge/usdj_static_body_3d.h
+++ b/modules/reality_merge/usdj_static_body_3d.h
@@ -74,7 +74,7 @@ class UsdjStaticBody3D : public PhysicsBody3D {
 
     UsdjStaticBody3D(UsdjStaticBody3D&&) = default;
 
-    UsdjStaticBody3D& operator=(UsdjStaticBody3D&&) = default;
+    UsdjStaticBody3D& operator=(UsdjStaticBody3D&&) = delete;
 
     AMobjId const* get_object_id() const;
 
diff --git a/modules/reality_merge/usdj_transform_3d_extractor.h b/modules/reality_merge/usdj_transform_3d_extractor.h
index a684a18..3ddcd5f 100644
--- a/modules/reality_merge/usdj_transform_3d_extractor.h
+++ b/modules/reality_merge/usdj_transform_3d_extractor.h
@@ -54,7 +54,7 @@ class UsdjTransform3dExtractor : public cavi::usdj_am::Visitor {
 
     UsdjTransform3dExtractor& operator=(UsdjTransform3dExtractor const&) = delete;
 
-    UsdjTransform3dExtractor& operator=(UsdjTransform3dExtractor&&) = default;
+    UsdjTransform3dExtractor& operator=(UsdjTransform3dExtractor&&) = delete;
 
     std::optional<Transform3D> operator()();
 
diff --git a/modules/reality_merge/usdj_velocity_extractor.h b/modules/reality_merge/usdj_velocity_extractor.h
index ac7a53c..26ebffd 100644
--- a/modules/reality_merge/usdj_velocity_extractor.h
+++ b/modules/reality_merge/usdj_velocity_extractor.h
@@ -54,7 +54,7 @@ class UsdjVelocityExtractor : public cavi::usdj_am::Visitor {
 
     UsdjVelocityExtractor& operator=(UsdjVelocityExtractor const&) = delete;
 
-    UsdjVelocityExtractor& operator=(UsdjVelocityExtractor&&) = default;
+    UsdjVelocityExtractor& operator=(UsdjVelocityExtractor&&) = delete;
 
     /// \throws std::invalid_argument
     std::optional<Vector3> operator()(cavi::usdj_am::usd::physics::TokenType const reference);