diff --git a/WickedEngine/shaders/ddgi_raytraceCS.hlsl b/WickedEngine/shaders/ddgi_raytraceCS.hlsl
index 5fe28af6f..4a3ccc3c6 100644
--- a/WickedEngine/shaders/ddgi_raytraceCS.hlsl
+++ b/WickedEngine/shaders/ddgi_raytraceCS.hlsl
@@ -51,7 +51,7 @@ void main(uint3 DTid : SV_DispatchThreadID, uint3 Gid : SV_GroupID, uint groupIn
 		> q;
 		q.TraceRayInline(
 			scene_acceleration_structure,	// RaytracingAccelerationStructure AccelerationStructure
-			0,								// uint RayFlags
+			RAY_FLAG_CULL_BACK_FACING_TRIANGLES,	// uint RayFlags
 			push.instanceInclusionMask,		// uint InstanceInclusionMask
 			ray								// RayDesc Ray
 		);
diff --git a/WickedEngine/shaders/rtdiffuseCS.hlsl b/WickedEngine/shaders/rtdiffuseCS.hlsl
index f7bc2194d..0850a3334 100644
--- a/WickedEngine/shaders/rtdiffuseCS.hlsl
+++ b/WickedEngine/shaders/rtdiffuseCS.hlsl
@@ -1,6 +1,5 @@
 #define RTAPI
 #define DISABLE_SOFT_SHADOWMAP
-#define DISABLE_TRANSPARENT_SHADOWMAP
 #define SURFACE_LOAD_MIPCONE
 #define TEXTURE_SLOT_NONUNIFORM
 
@@ -50,7 +49,7 @@ void main(uint2 DTid : SV_DispatchThreadID)
 	//const float2 bluenoise = blue_noise(DTid.xy).xy;
 	//const float3 R = normalize(mul(hemispherepoint_cos(bluenoise.x, bluenoise.y), get_tangentspace(N)));
 
-	const uint samplecount = 1;
+	const uint samplecount = 2;
 	for (uint i = 0; i < samplecount; ++i)
 	{
 		const float2 bluenoise = blue_noise(DTid.xy, (float)i / (float)samplecount).xy;
@@ -69,7 +68,8 @@ void main(uint2 DTid : SV_DispatchThreadID)
 		float4 additive_dist = float4(0, 0, 0, FLT_MAX);
 
 		RayQuery<
-			RAY_FLAG_SKIP_PROCEDURAL_PRIMITIVES
+			RAY_FLAG_SKIP_PROCEDURAL_PRIMITIVES |
+			RAY_FLAG_CULL_BACK_FACING_TRIANGLES
 		> q;
 		q.TraceRayInline(
 			scene_acceleration_structure,	// RaytracingAccelerationStructure AccelerationStructure
diff --git a/WickedEngine/shaders/rtreflectionCS.hlsl b/WickedEngine/shaders/rtreflectionCS.hlsl
index acd62505c..05c64fee2 100644
--- a/WickedEngine/shaders/rtreflectionCS.hlsl
+++ b/WickedEngine/shaders/rtreflectionCS.hlsl
@@ -70,7 +70,8 @@ void main(uint2 DTid : SV_DispatchThreadID)
 	float4 additive_dist = float4(0, 0, 0, FLT_MAX);
 
 	RayQuery<
-		RAY_FLAG_SKIP_PROCEDURAL_PRIMITIVES
+		RAY_FLAG_SKIP_PROCEDURAL_PRIMITIVES |
+		RAY_FLAG_CULL_BACK_FACING_TRIANGLES
 	> q;
 	q.TraceRayInline(
 		scene_acceleration_structure,	// RaytracingAccelerationStructure AccelerationStructure
diff --git a/WickedEngine/shaders/surfel_raytraceCS.hlsl b/WickedEngine/shaders/surfel_raytraceCS.hlsl
index 57e26bc22..405a790ea 100644
--- a/WickedEngine/shaders/surfel_raytraceCS.hlsl
+++ b/WickedEngine/shaders/surfel_raytraceCS.hlsl
@@ -48,7 +48,7 @@ void main(uint3 DTid : SV_DispatchThreadID)
 		> q;
 		q.TraceRayInline(
 			scene_acceleration_structure,	// RaytracingAccelerationStructure AccelerationStructure
-			0,								// uint RayFlags
+			RAY_FLAG_CULL_BACK_FACING_TRIANGLES,	// uint RayFlags
 			push.instanceInclusionMask,		// uint InstanceInclusionMask
 			ray								// RayDesc Ray
 		);
diff --git a/WickedEngine/wiVersion.cpp b/WickedEngine/wiVersion.cpp
index a5a541f12..1f6f0b90f 100644
--- a/WickedEngine/wiVersion.cpp
+++ b/WickedEngine/wiVersion.cpp
@@ -9,7 +9,7 @@ namespace wi::version
 	// minor features, major updates, breaking compatibility changes
 	const int minor = 71;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 196;
+	const int revision = 197;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);