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

@@ -32,6 +32,12 @@ pxr::HdMeshTopology BlenderSceneDelegate::GetMeshTopology(pxr::SdfPath const &id
 pxr::GfMatrix4d BlenderSceneDelegate::GetTransform(pxr::SdfPath const &id)
 {
   CLOG_INFO(LOG_RENDER_HYDRA_SCENE, 3, "%s", id.GetText());
+
+  pxr::SdfPath i_id = instancer_prim_id(id);
+  if (!i_id.IsEmpty()) {
+    InstancerData *i_data = instancer_data(i_id);
+    return i_data->get_transform(id);
+  }
   ObjectData *obj_data = object_data(id);
   if (obj_data) {
     return obj_data->transform;
@@ -212,6 +218,18 @@ pxr::SdfPath BlenderSceneDelegate::instancer_prim_id(Object *object) const
   return prim_id((ID *)object, "I");
 }
 
+pxr::SdfPath BlenderSceneDelegate::instancer_prim_id(pxr::SdfPath const &child_id) const
+{
+  int n = child_id.GetPathElementCount();
+  if (n == 3) {
+    return child_id.GetParentPath();
+  }
+  if (n == 4) {
+    return child_id.GetParentPath().GetParentPath();
+  }
+  return pxr::SdfPath();
+}
+
 pxr::SdfPath BlenderSceneDelegate::world_prim_id() const
 {
   return GetDelegateID().AppendElementString("World");

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

@@ -64,6 +64,7 @@ class BlenderSceneDelegate : public pxr::HdSceneDelegate {
   pxr::SdfPath object_prim_id(Object *object) const;
   pxr::SdfPath material_prim_id(Material *mat) const;
   pxr::SdfPath instancer_prim_id(Object *object) const;
+  pxr::SdfPath instancer_prim_id(pxr::SdfPath const &child_id) const;
   pxr::SdfPath world_prim_id() const;
 
   ObjectData *object_data(pxr::SdfPath const &id) const;

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

@@ -107,6 +107,11 @@ bool InstancerData::update_visibility()
   return ret;
 }
 
+pxr::GfMatrix4d InstancerData::get_transform(pxr::SdfPath const &id) const
+{
+  return pxr::GfMatrix4d(1.0);
+}
+
 pxr::HdPrimvarDescriptorVector InstancerData::primvar_descriptors(
     pxr::HdInterpolation interpolation) const
 {
@@ -146,7 +151,6 @@ void InstancerData::check_update(Object *object)
   }
   ObjectData *obj_data = it->second.obj_data.get();
   obj_data->update();
-  obj_data->transform = pxr::GfMatrix4d(1.0);
 
   pxr::HdDirtyBits bits = pxr::HdChangeTracker::Clean;
   if (object->id.recalc & ID_RECALC_TRANSFORM) {
@@ -211,24 +215,36 @@ void InstancerData::set_instances()
   int index = 0;
   Instance *inst;
   pxr::SdfPath p_id;
+  Object *ob;
 
   ListBase *lb = object_duplilist(
       scene_delegate_->depsgraph, scene_delegate_->scene, (Object *)id);
   LISTBASE_FOREACH (DupliObject *, dupli, lb) {
+    ob = dupli->ob;
+    if (!is_supported(ob)) {
+      continue;
+    }
     p_id = object_prim_id(dupli->ob);
-    auto it = mesh_instances_.find(p_id);
-    if (it == mesh_instances_.end()) {
-      inst = &mesh_instances_[p_id];
-      if (!is_supported(dupli->ob)) {
-        continue;
+    if (ob->type == OB_LAMP) {
+      auto it = mesh_instances_.find(p_id);
+      if (it == mesh_instances_.end()) {
+        inst = &mesh_instances_[p_id];
+        inst->obj_data = std::make_unique<LightData>(scene_delegate_, ob, p_id);
+        inst->obj_data->init();
+      }
+      else {
+        inst = &it->second;
       }
-      inst->obj_data = ObjectData::create(scene_delegate_, dupli->ob, p_id);
-
-      /* Instance's transform should be identity */
-      inst->obj_data->transform = pxr::GfMatrix4d(1.0);
     }
     else {
-      inst = &it->second;
+      auto it = mesh_instances_.find(p_id);
+      if (it == mesh_instances_.end()) {
+        inst = &mesh_instances_[p_id];
+        inst->obj_data = ObjectData::create(scene_delegate_, ob, p_id);
+      }
+      else {
+        inst = &it->second;
+      }
     }
     mesh_transforms_.push_back(gf_matrix_from_transform(dupli->mat));
     inst->indices.push_back(index);

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

@@ -31,6 +31,7 @@ class InstancerData : public ObjectData {
   pxr::VtValue get_data(pxr::TfToken const &key) const override;
   bool update_visibility() override;
 
+  pxr::GfMatrix4d get_transform(pxr::SdfPath const &id) const;
   pxr::HdPrimvarDescriptorVector primvar_descriptors(pxr::HdInterpolation interpolation) const;
   pxr::VtIntArray indices(pxr::SdfPath const &id) const;
   ObjectData *object_data(pxr::SdfPath const &id) const;