diff --git a/lroom.cpp b/lroom.cpp
index 606450e..b021a30 100644
--- a/lroom.cpp
+++ b/lroom.cpp
@@ -129,7 +129,7 @@ LRoom * LRoom::DOB_Update(LRoomManager &manager, Spatial * pDOB)
 // objects can still be rendered outside immediate view for casting shadows.
 // All objects in view (that are set to cast shadows) should cast shadows, so the actual
 // shown objects are a superset of the softshown.
-void LRoom::SoftShow(VisualInstance * pVI, bool bShow) const
+void LRoom::SoftShow(VisualInstance * pVI, bool bShow)
 {
 	// hijack this layer number
 	uint32_t mask = pVI->get_layer_mask();
@@ -166,6 +166,25 @@ void LRoom::SoftShow(VisualInstance * pVI, bool bShow) const
 }
 
 
+// naive version, adds all the non visible objects in visible rooms as shadow casters
+void LRoom::AddShadowCasters(LRoomManager &manager)
+{
+	int last_sob = m_iFirstSOB + m_iNumSOBs;
+	for (int n=m_iFirstSOB; n<last_sob; n++)
+	{
+		bool bVisible = manager.m_BF_visible_SOBs.GetBit(n) != 0;
+
+		// already in list
+		if (bVisible)
+			continue;
+
+		manager.m_BF_render_SOBs.SetBit(n, true);
+		manager.m_RenderList_SOBs.push_back(n);
+	}
+
+}
+
+
 // hide all the objects not hit on this frame .. instead of calling godot hide without need
 // (it might be expensive)
 void LRoom::FinalizeVisibility(LRoomManager &manager)
diff --git a/lroom.h b/lroom.h
index b0036ea..a4bbc21 100644
--- a/lroom.h
+++ b/lroom.h
@@ -108,6 +108,8 @@ public:
 	// (it might be expensive)
 	void FinalizeVisibility(LRoomManager &manager);
 
+	// naive version, adds all the non visible objects in visible rooms as shadow casters
+	void AddShadowCasters(LRoomManager &manager);
 
 	void DOB_Add(const LDob &dob);
 	const LDob &DOB_Get(unsigned int ui) const {return m_DOBs[ui];}
@@ -126,7 +128,7 @@ private:
 	// instead of directly showing and hiding objects we now set their layer,
 	// and the camera will hide them with a cull mask. This is so that
 	// objects can still be rendered outside immediate view for casting shadows.
-	void SoftShow(VisualInstance * pVI, bool bShow) const;
+	static void SoftShow(VisualInstance * pVI, bool bShow);
 
 	// whether lportal thinks this room is currently visible
 	// this allows us to show / hide dobs as they cross room boundaries
diff --git a/lroom_manager.cpp b/lroom_manager.cpp
index d0b5c72..812abc7 100644
--- a/lroom_manager.cpp
+++ b/lroom_manager.cpp
@@ -698,6 +698,14 @@ void LRoomManager::FrameUpdate()
 	// set soft visibility of objects within visible rooms
 	FrameUpdate_FinalizeVisibility_WithinRooms();
 
+	FrameUpdate_AddShadowCasters();
+
+	// swap the current and previous visible room list
+	LVector<int> * pTemp = m_pCurr_VisibleRoomList;
+	m_pCurr_VisibleRoomList = m_pPrev_VisibleRoomList;
+	m_pPrev_VisibleRoomList = pTemp;
+
+
 	// draw debug
 	FrameUpdate_DrawDebug(cam, *pRoom);
 
@@ -735,6 +743,17 @@ void LRoomManager::FrameUpdate_FinalizeRooms()
 	}
 }
 
+void LRoomManager::FrameUpdate_AddShadowCasters()
+{
+	// simple for the moment, add all objects in visible rooms as casters if they are not already visible
+	for (int n=0; n<m_pCurr_VisibleRoomList->size(); n++)
+	{
+		int r = (*m_pCurr_VisibleRoomList)[n];
+		m_Rooms[r].AddShadowCasters(*this);
+	}
+
+}
+
 void LRoomManager::FrameUpdate_FinalizeVisibility_WithinRooms()
 {
 	// and hide all the dobs that are in visible rooms that haven't been made visible
@@ -747,10 +766,6 @@ void LRoomManager::FrameUpdate_FinalizeVisibility_WithinRooms()
 		m_Rooms[r].FinalizeVisibility(*this);
 	}
 
-	// swap the current and previous visible room list
-	LVector<int> * pTemp = m_pCurr_VisibleRoomList;
-	m_pCurr_VisibleRoomList = m_pPrev_VisibleRoomList;
-	m_pPrev_VisibleRoomList = pTemp;
 
 }
 
diff --git a/lroom_manager.h b/lroom_manager.h
index 9c06af7..836fbe8 100644
--- a/lroom_manager.h
+++ b/lroom_manager.h
@@ -97,6 +97,7 @@ private:
 	void FrameUpdate();
 	void FrameUpdate_Prepare();
 	void FrameUpdate_FinalizeRooms();
+	void FrameUpdate_AddShadowCasters();
 	void FrameUpdate_FinalizeVisibility_WithinRooms();
 
 	// debugging emulate view frustum