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

@@ -28,6 +28,10 @@ VolumeModifierData::VolumeModifierData(BlenderSceneDelegate *scene_delegate,
 
 bool VolumeModifierData::is_volume_modifier(Object *object)
 {
+  if (object->type != OB_MESH) {
+    return false;
+  }
+
   FluidModifierData *volume_modifier = (FluidModifierData *)BKE_modifiers_findby_type(
       object, eModifierType_Fluid);
   return volume_modifier && volume_modifier->type & MOD_FLUID_TYPE_DOMAIN &&
@@ -62,6 +66,33 @@ void VolumeModifierData::init()
   write_materials();
 }
 
+void VolumeModifierData::update()
+{
+  Object *object = (Object *)id;
+  if ((id->recalc & ID_RECALC_GEOMETRY) || (((ID *)object->data)->recalc & ID_RECALC_GEOMETRY)) {
+    remove();
+    init();
+    insert();
+    return;
+  }
+  pxr::HdDirtyBits bits = pxr::HdChangeTracker::Clean;
+  if (id->recalc & ID_RECALC_SHADING) {
+    write_materials();
+    bits |= pxr::HdChangeTracker::DirtyMaterialId | pxr::HdChangeTracker::DirtyDoubleSided;
+  }
+  if (id->recalc & ID_RECALC_TRANSFORM) {
+    write_transform();
+    bits |= pxr::HdChangeTracker::DirtyTransform;
+  }
+
+  if (bits == pxr::HdChangeTracker::Clean) {
+    return;
+  }
+
+  scene_delegate_->GetRenderIndex().GetChangeTracker().MarkRprimDirty(prim_id, bits);
+  ID_LOG(1, "");
+}
+
 void VolumeModifierData::write_transform()
 {
   Object *object = (Object *)this->id;

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

@@ -18,6 +18,7 @@ class VolumeModifierData : public VolumeData {
   static bool is_volume_modifier(Object *object);
 
   void init() override;
+  void update() override;
 
  private:
   void write_transform() override;