turned on backface culling for lightmap tracing

WickedEngine/renderlightmapPS_indirect.hlsl

@@ -1,5 +1,5 @@
 #define RAYTRACE_EXIT 128 // doing the path trace in pixel shader will hang the GPU for some reason if we don't set a cap on the trace loop...
-//#define RAY_BACKFACE_CULLING
+#define RAY_BACKFACE_CULLING
 #include "globals.hlsli"
 #include "ShaderInterop_TracedRendering.h"
 #include "tracedRenderingHF.hlsli"

WickedEngine/wiVersion.cpp

@@ -9,7 +9,7 @@ namespace wiVersion
 	// minor features, major updates
 	const int minor = 24;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 20;
+	const int revision = 21;
 
 
 	long GetVersion()