Optimize dirty shadow bounds update for particles and foliage

Source/Engine/Foliage/Foliage.cpp

@@ -909,7 +909,7 @@ void Foliage::RebuildClusters()
         _box = BoundingBox(_transform.Translation, _transform.Translation);
         _sphere = BoundingSphere(_transform.Translation, 0.0f);
         if (_sceneRenderingKey != -1)
-            GetSceneRendering()->UpdateActor(this, _sceneRenderingKey);
+            GetSceneRendering()->UpdateActor(this, _sceneRenderingKey, ISceneRenderingListener::Bounds);
         return;
     }
 

Source/Engine/Particles/ParticleEffect.cpp

@@ -372,7 +372,7 @@ void ParticleEffect::UpdateBounds()
     _box = bounds;
     BoundingSphere::FromBox(bounds, _sphere);
     if (_sceneRenderingKey != -1)
-        GetSceneRendering()->UpdateActor(this, _sceneRenderingKey);
+        GetSceneRendering()->UpdateActor(this, _sceneRenderingKey, ISceneRenderingListener::Bounds);
 }
 
 void ParticleEffect::Sync()

Source/Engine/Renderer/ShadowsPass.cpp

@@ -404,8 +404,17 @@ public:
         // Dirty static objects to redraw when changed (eg. material modification)
         if (a->HasStaticFlag(StaticFlags::Shadow))
         {
-            DirtyStaticBounds(prevBounds);
-            DirtyStaticBounds(a->GetSphere());
+            // TODO: skip actors that don't cast shadows (eg. particles)
+            BoundingSphere bounds = a->GetSphere();
+            if (bounds != prevBounds)
+            {
+                // Avoid dirtying twice when bounds are close to each other
+                if (BoundingSphere::NearEqual(bounds, prevBounds, METERS_TO_UNITS_SCALE))
+                    BoundingSphere::Merge(bounds, prevBounds, bounds);
+                else
+                    DirtyStaticBounds(prevBounds);
+            }
+            DirtyStaticBounds(bounds);
         }
         else if (flags & StaticFlags)
         {