source/blender/render/hydra/engine.cc

@@ -25,7 +25,7 @@ Engine::Engine(RenderEngine *bl_engine, const std::string &render_delegate_name)
   pxr::TF_PY_ALLOW_THREADS_IN_SCOPE();
   render_delegate_ = registry.CreateRenderDelegate(pxr::TfToken(render_delegate_name_));
 
-  /* Current USD (23.02) has limited support for Vulkan. To make it works USD should be built
+  /* USD has limited support for Vulkan. To make it works USD should be built
    * with PXR_ENABLE_VULKAN_SUPPORT=TRUE which is not possible now */
   if (GPU_backend_get_type() == GPU_BACKEND_VULKAN) {
     BLI_setenv("HGI_ENABLE_VULKAN", "1");

source/blender/render/hydra/scene_delegate/blender_scene_delegate.cc

@@ -15,7 +15,7 @@ CLG_LOGREF_DECLARE_GLOBAL(LOG_RENDER_HYDRA_SCENE, "render.hydra.scene");
 BlenderSceneDelegate::BlenderSceneDelegate(pxr::HdRenderIndex *parent_index,
                                            pxr::SdfPath const &delegate_id,
                                            BlenderSceneDelegate::EngineType engine_type,
-                                           std::string render_delegate_name)
+                                           const std::string &render_delegate_name)
     : HdSceneDelegate(parent_index, delegate_id),
       engine_type(engine_type),
       render_delegate_name(render_delegate_name)
@@ -258,6 +258,8 @@ InstancerData *BlenderSceneDelegate::instancer_data(pxr::SdfPath const &id, bool
 {
   pxr::SdfPath p_id;
   if (child_id) {
+    /* Getting instancer path id from child Mesh instance (consist with 3 path elements) and
+     * Light instance (consist with 4 path elements) */
     int n = id.GetPathElementCount();
     if (n == 3) {
       p_id = id.GetParentPath();

source/blender/render/hydra/scene_delegate/blender_scene_delegate.h

@@ -30,7 +30,7 @@ class BlenderSceneDelegate : public pxr::HdSceneDelegate {
   BlenderSceneDelegate(pxr::HdRenderIndex *parent_index,
                        pxr::SdfPath const &delegate_id,
                        BlenderSceneDelegate::EngineType engine_type,
-                       std::string render_delegate_name);
+                       const std::string &render_delegate_name);
   ~BlenderSceneDelegate() override = default;
 
   /* Delegate methods */