diff --git a/plugins/rendermax/renderer_light.cpp b/plugins/rendermax/renderer_light.cpp
index 5dcc47dca..4a59ac5a3 100644
--- a/plugins/rendermax/renderer_light.cpp
+++ b/plugins/rendermax/renderer_light.cpp
@@ -21,6 +21,7 @@
 #include "df/world.h"
 #include "df/building.h"
 #include "df/building_doorst.h"
+#include "df/building_floodgatest.h"
 #include "df/plant.h"
 #include "df/plant_raw.h"
 
@@ -901,6 +902,12 @@ void lightingEngineViewscreen::doOcupancyAndLights()
                 if(!door->door_flags.bits.closed)
                     continue;
             }
+            else if(type==df::enums::building_type::Floodgate)
+            {
+                df::building_floodgatest* gate=static_cast<df::building_floodgatest*>(bld);
+                if(!gate->gate_flags.bits.closed)
+                    continue;
+            }
             
             
             if(def->useMaterial)
diff --git a/plugins/rendermax/renderer_light.hpp b/plugins/rendermax/renderer_light.hpp
index ad90ca5eb..5466ff01f 100644
--- a/plugins/rendermax/renderer_light.hpp
+++ b/plugins/rendermax/renderer_light.hpp
@@ -128,6 +128,7 @@ struct buildingLightDef
     bool useMaterial;
     float thickness;
     float size;
+    buildingLightDef():poweredOnly(false),useMaterial(true),thickness(1.0f),size(1.0f){}
 };
 class lightingEngineViewscreen:public lightingEngine
 {
diff --git a/plugins/rendermax/rendermax.lua b/plugins/rendermax/rendermax.lua
index cbd7b3536..c5e7c21a7 100644
--- a/plugins/rendermax/rendermax.lua
+++ b/plugins/rendermax/rendermax.lua
@@ -145,4 +145,5 @@ addBuilding("Statue",{1,1,1},{0.9,0.75,0.3},8)
 addBuilding("Bed",{1,1,1},{0.3,0.2,0.0},2)
 addBuilding("WindowGlass",nil,nil,0,{"useMaterial"})
 addBuilding("WindowGem",nil,nil,0,{"useMaterial"})
-addBuilding("Door",nil,nil,0,{"useMaterial"}) -- special case, only closed door obstruct/emit light
\ No newline at end of file
+addBuilding("Door",nil,nil,0,{"useMaterial"}) -- special case, only closed door obstruct/emit light
+addBuilding("Floodgate",nil,nil,0,{"useMaterial"}) -- special case, only closed door obstruct/emit light