diff --git a/src/gamedata/r_defs.h b/src/gamedata/r_defs.h
index d6453b6f8a..bf0f6be4b9 100644
--- a/src/gamedata/r_defs.h
+++ b/src/gamedata/r_defs.h
@@ -1029,6 +1029,16 @@ public:
 		return pos == floor? floorplane:ceilingplane;
 	}
 
+	void SetPlaneReflectivity(int pos, double val)
+	{
+		reflect[pos] = val;
+	}
+
+	double GetPlaneReflectivity(int pos)
+	{
+		return reflect[pos];
+	}
+
 	bool isSecret() const
 	{
 		return !!(Flags & SECF_SECRET);
diff --git a/src/scripting/vmthunks.cpp b/src/scripting/vmthunks.cpp
index a0e1b22a11..b8241fc112 100644
--- a/src/scripting/vmthunks.cpp
+++ b/src/scripting/vmthunks.cpp
@@ -869,6 +869,32 @@ DEFINE_ACTION_FUNCTION_NATIVE(_Sector, SetXOffset, SetXOffset)
 	 ACTION_RETURN_INT(self->GetLightLevel());
  }
 
+ static void SetPlaneReflectivity(sector_t* self, int pos, double val)
+ {
+	 self->SetPlaneReflectivity(pos, val);
+ }
+
+ DEFINE_ACTION_FUNCTION_NATIVE(_Sector, SetPlaneReflectivity, SetPlaneReflectivity)
+ {
+	 PARAM_SELF_STRUCT_PROLOGUE(sector_t);
+	 PARAM_INT(pos);
+	 PARAM_FLOAT(val)
+	 self->SetPlaneReflectivity(pos, val);
+	 return 0;
+ }
+
+ static double GetPlaneReflectivity(sector_t* self, int pos)
+ {
+	 return self->GetPlaneReflectivity(pos);
+ }
+
+ DEFINE_ACTION_FUNCTION_NATIVE(_Sector, GetPlaneReflectivity, GetPlaneReflectivity)
+ {
+	 PARAM_SELF_STRUCT_PROLOGUE(sector_t);
+	 PARAM_INT(pos);
+	 ACTION_RETURN_FLOAT(self->GetPlaneReflectivity(pos));
+ }
+
  static int PortalBlocksView(sector_t *self, int pos)
  {
 	 return self->PortalBlocksView(pos);
diff --git a/wadsrc/static/zscript/mapdata.zs b/wadsrc/static/zscript/mapdata.zs
index 06a7bf3ead..9031b31587 100644
--- a/wadsrc/static/zscript/mapdata.zs
+++ b/wadsrc/static/zscript/mapdata.zs
@@ -553,6 +553,8 @@ struct Sector native play
 	native void ChangeLightLevel(int newval);
 	native void SetLightLevel(int newval);
 	native clearscope int GetLightLevel() const;
+	native void SetPlaneReflectivity(int pos, double val);
+	native clearscope double GetPlaneReflectivity(int pos);
 	native void AdjustFloorClip();
 	native clearscope bool IsLinked(Sector other, bool ceiling) const;