source/blender/io/usd/hydra/hydra_scene_delegate.cc

@@ -5,6 +5,7 @@
 
 #include <bitset>
 
+#include "DNA_light_types.h"
 #include "DNA_scene_types.h"
 
 #include "BLI_set.hh"
@@ -238,6 +239,39 @@ void HydraSceneDelegate::clear()
   view3d = nullptr;
 }
 
+bool HydraSceneDelegate::has_shadows()
+{
+
+  bool has_shadows = false;
+
+  DEGObjectIterSettings settings = {0};
+  settings.depsgraph = depsgraph;
+  settings.flags = DEG_OBJECT_ITER_FOR_RENDER_ENGINE_FLAGS;
+  DEGObjectIterData data = {0};
+  data.settings = &settings;
+  data.graph = settings.depsgraph;
+  data.flag = settings.flags;
+
+  ITER_BEGIN (DEG_iterator_objects_begin,
+              DEG_iterator_objects_next,
+              DEG_iterator_objects_end,
+              &data,
+              Object *,
+              object)
+  {
+    if (object->type == OB_LAMP) {
+      Light *light = (Light *)object->data;
+      has_shadows |= light->mode & LA_SHADOW;
+      if (has_shadows) {
+        break;
+      }
+    }
+  }
+  ITER_END;
+
+  return has_shadows;
+}
+
 pxr::SdfPath HydraSceneDelegate::prim_id(ID *id, const char *prefix) const
 {
   /* Making id of object in form like <prefix>_<pointer in 16 hex digits format> */

source/blender/io/usd/hydra/hydra_scene_delegate.h

@@ -44,7 +44,6 @@ class HydraSceneDelegate : public pxr::HdSceneDelegate {
     std::string studiolight_name;
     float studiolight_rotation;
     float studiolight_intensity;
-    bool use_storm_shadows = false;
 
     bool operator==(const ShadingSettings &other);
   };
@@ -91,6 +90,7 @@ class HydraSceneDelegate : public pxr::HdSceneDelegate {
 
   void populate(Depsgraph *depsgraph, View3D *v3d);
   void clear();
+  bool has_shadows();
 
  private:
   pxr::SdfPath prim_id(ID *id, const char *prefix) const;

source/blender/io/usd/hydra/light.cc

@@ -148,9 +148,10 @@ void LightData::write_shadow_params()
    we verified if any of light's shadow is turned on, if yes shadow task will be added*/
   Light *light = (Light *)((Object *)id)->data;
   bool use_shadow = (light->mode & LA_SHADOW) && light->type == LA_SUN;
-  scene_delegate_->shading_settings.use_storm_shadows |= use_shadow;
-  if (use_shadow) {
   data_[pxr::HdLightTokens->hasShadow] = use_shadow;
+  if (!use_shadow) {
+    return;
+  }
   pxr::HdxShadowParams shadow_params = pxr::HdxShadowParams();
 
   /* ShadowMatrix class is used to calculates shadow matrix from light frustum.*/
@@ -174,7 +175,6 @@ void LightData::write_shadow_params()
   data_[pxr::HdLightTokens->shadowCollection] = pxr::HdRprimCollection(
       pxr::HdTokens->geometry, pxr::HdReprSelector(pxr::HdReprTokens->refined));
 }
-}
 
 void LightData::insert()
 {

source/blender/render/hydra/final_engine.cc

@@ -27,6 +27,7 @@ void FinalEngine::render(Depsgraph *depsgraph)
 {
   const Scene *scene = DEG_get_evaluated_scene(depsgraph);
   const ViewLayer *view_layer = DEG_get_evaluated_view_layer(depsgraph);
+  bool has_shadows = hydra_scene_delegate_->has_shadows();
 
   char scene_name[MAX_ID_FULL_NAME];
   BKE_id_full_name_get(scene_name, &scene->id, 0);
@@ -50,7 +51,7 @@ void FinalEngine::render(Depsgraph *depsgraph)
   render_task_delegate_->set_viewport(pxr::GfVec4d(0, 0, resolution_[0], resolution_[1]));
   if (light_tasks_delegate_) {
     light_tasks_delegate_->set_viewport(pxr::GfVec4d(0, 0, resolution_[0], resolution_[1]));
-    light_tasks_delegate_->set_shadows(hydra_scene_delegate_->shading_settings.use_storm_shadows);
+    light_tasks_delegate_->set_shadows(has_shadows);
   }
 
   render_task_delegate_->add_aov(pxr::HdAovTokens->color);
@@ -73,7 +74,7 @@ void FinalEngine::render(Depsgraph *depsgraph)
       tasks.push_back(light_tasks_delegate_->skydome_task());
     }
     tasks.push_back(light_tasks_delegate_->simple_task());
-    if (hydra_scene_delegate_->shading_settings.use_storm_shadows) {
+    if (has_shadows) {
       tasks.push_back(light_tasks_delegate_->shadow_task());
     }
   }

source/blender/render/hydra/viewport_engine.cc

@@ -219,6 +219,8 @@ void ViewportEngine::render(Depsgraph *depsgraph, bContext *context)
 {
   ViewSettings view_settings(context);
   const Scene *scene = DEG_get_evaluated_scene(depsgraph);
+  bool has_shadows = hydra_scene_delegate_->has_shadows();
+
   if (view_settings.width() * view_settings.height() == 0) {
     return;
   };
@@ -233,7 +235,7 @@ void ViewportEngine::render(Depsgraph *depsgraph, bContext *context)
   render_task_delegate_->set_viewport(viewport);
   if (light_tasks_delegate_) {
     light_tasks_delegate_->set_viewport(viewport);
-    light_tasks_delegate_->set_shadows(hydra_scene_delegate_->shading_settings.use_storm_shadows);
+    light_tasks_delegate_->set_shadows(has_shadows);
   }
 
   render_task_delegate_->add_aov(pxr::HdAovTokens->color);
@@ -245,7 +247,7 @@ void ViewportEngine::render(Depsgraph *depsgraph, bContext *context)
       tasks.push_back(light_tasks_delegate_->skydome_task());
     }
     tasks.push_back(light_tasks_delegate_->simple_task());
-    if (hydra_scene_delegate_->shading_settings.use_storm_shadows) {
+    if (has_shadows) {
       tasks.push_back(light_tasks_delegate_->shadow_task());
     }
   }