diff --git a/WickedEngine/shaders/raytraceCS.hlsl b/WickedEngine/shaders/raytraceCS.hlsl
index 1cb046591..85c0ac6b6 100644
--- a/WickedEngine/shaders/raytraceCS.hlsl
+++ b/WickedEngine/shaders/raytraceCS.hlsl
@@ -16,6 +16,7 @@ RWTexture2D<float4> output_albedo : register(u1);
 RWTexture2D<float4> output_normal : register(u2);
 RWTexture2D<float> output_depth : register(u3);
 RWTexture2D<uint> output_stencil : register(u4);
+RWTexture2D<uint> output_primitiveID : register(u5);
 
 [numthreads(RAYTRACING_LAUNCH_BLOCKSIZE, RAYTRACING_LAUNCH_BLOCKSIZE, 1)]
 void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
@@ -35,6 +36,9 @@ void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
 	float3 primary_albedo = 0;
 	float3 primary_normal = 0;
 
+	// for primID post effect:
+	uint primary_primitiveID = 0;
+
 	// Create starting ray:
 	RayDesc ray = CreateCameraRay(pixel, xTracePixelOffset);
 
@@ -167,6 +171,9 @@ void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
 		surface.hit_depth = q.CommittedRayT();
 		if (!surface.load(prim, q.CommittedTriangleBarycentrics()))
 			return;
+			
+		if (primary_primitiveID == 0)
+			primary_primitiveID = prim.pack();
 
 #else
 		// ray origin updated for next bounce:
@@ -178,6 +185,9 @@ void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
 		if (!surface.load(hit.primitiveID, hit.bary))
 			return;
 
+		if (primary_primitiveID == 0)
+			primary_primitiveID = hit.primitiveID.pack();
+
 #endif // RTAPI
 
 		surface.P = ray.Origin;
@@ -455,5 +465,6 @@ void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
 	{
 		output_depth[pixel] = depth;
 		output_stencil[pixel] = stencil;
+		output_primitiveID[pixel] = primary_primitiveID;
 	}
 }
diff --git a/WickedEngine/wiRenderPath3D_PathTracing.cpp b/WickedEngine/wiRenderPath3D_PathTracing.cpp
index b3c40efea..05e3fb5ae 100644
--- a/WickedEngine/wiRenderPath3D_PathTracing.cpp
+++ b/WickedEngine/wiRenderPath3D_PathTracing.cpp
@@ -57,6 +57,14 @@ namespace wi
 			device->CreateTexture(&desc, nullptr, &rtMain);
 			device->SetName(&rtMain, "rtMain");
 
+			desc.format = wi::renderer::format_idbuffer;
+			desc.bind_flags = BindFlag::UNORDERED_ACCESS | BindFlag::SHADER_RESOURCE;
+			desc.width = internalResolution.x;
+			desc.height = internalResolution.y;
+			desc.sample_count = 1;
+			device->CreateTexture(&desc, nullptr, &rtPrimitiveID);
+			device->SetName(&rtPrimitiveID, "rtPrimitiveID");
+
 			desc.bind_flags = BindFlag::UNORDERED_ACCESS | BindFlag::SHADER_RESOURCE | BindFlag::RENDER_TARGET;
 			desc.format = Format::R32G32B32A32_FLOAT;
 			desc.width = internalResolution.x;
@@ -393,10 +401,16 @@ namespace wi
 						denoiserNormal.IsValid() ? &denoiserNormal : nullptr,
 						&traceDepth,
 						&traceStencil,
-						&depthBuffer_Main
+						&depthBuffer_Main,
+						&rtPrimitiveID
 					);
 
 					wi::profiler::EndRange(range); // Traced Scene
+
+					if (sam == 0 && getMeshBlendEnabled() && visibility_main.IsMeshBlendVisible())
+					{
+						wi::renderer::PostProcess_MeshBlend_EdgeProcess(meshblendResources, cmd);
+					}
 				}
 
 				if (getVolumeLightsEnabled() && visibility_main.IsRequestedVolumetricLights())
@@ -481,8 +495,8 @@ namespace wi
 			// Composite other effects on top:
 			{
 				RenderPassImage rp[] = {
+					RenderPassImage::RenderTarget(&rtMain, RenderPassImage::LoadOp::CLEAR),
 					RenderPassImage::DepthStencil(&depthBuffer_Main, RenderPassImage::LoadOp::LOAD),
-					RenderPassImage::RenderTarget(&rtMain, RenderPassImage::LoadOp::CLEAR)
 				};
 				device->RenderPassBegin(rp, arraysize(rp), cmd);
 
@@ -563,6 +577,12 @@ namespace wi
 				}
 
 				device->RenderPassEnd(cmd);
+
+				if (getMeshBlendEnabled() && visibility_main.IsMeshBlendVisible())
+				{
+					rp[0].loadop = RenderPassImage::LoadOp::LOAD;
+					wi::renderer::PostProcess_MeshBlend_Resolve(meshblendResources, rtMain, rp, arraysize(rp), cmd);
+				}
 			}
 
 			// Post processing:
diff --git a/WickedEngine/wiRenderer.cpp b/WickedEngine/wiRenderer.cpp
index 41f252886..e9c1c30d9 100644
--- a/WickedEngine/wiRenderer.cpp
+++ b/WickedEngine/wiRenderer.cpp
@@ -10621,7 +10621,8 @@ void RayTraceScene(
 	const Texture* output_normal,
 	const Texture* output_depth,
 	const Texture* output_stencil,
-	const Texture* output_depth_stencil
+	const Texture* output_depth_stencil,
+	const Texture* output_primitiveID
 )
 {
 	if (!scene.TLAS.IsValid() && !scene.BVH.IsValid())
@@ -10665,6 +10666,7 @@ void RayTraceScene(
 		&nullUAV,
 		&nullUAV,
 		&nullUAV,
+		& nullUAV,
 		&nullUAV,
 	};
 	device->BindUAVs(uavs, 0, arraysize(uavs), cmd);
@@ -10687,6 +10689,11 @@ void RayTraceScene(
 	{
 		device->BindUAV(output_stencil, 4, cmd);
 	}
+	if (output_primitiveID != nullptr)
+	{
+		device->BindUAV(output_primitiveID, 5, cmd);
+		PushBarrier(GPUBarrier::Image(output_primitiveID, output_primitiveID->desc.layout, ResourceState::UNORDERED_ACCESS));
+	}
 	FlushBarriers(cmd);
 
 	if (accumulation_sample == 0)
@@ -10713,6 +10720,11 @@ void RayTraceScene(
 			device->ClearUAV(output_stencil, 0, cmd);
 			PushBarrier(GPUBarrier::Memory(output_stencil));
 		}
+		if (output_primitiveID != nullptr)
+		{
+			device->ClearUAV(output_primitiveID, 0, cmd);
+			PushBarrier(GPUBarrier::Memory(output_primitiveID));
+		}
 		FlushBarriers(cmd);
 	}
 
@@ -10723,6 +10735,11 @@ void RayTraceScene(
 		cmd
 	);
 
+	if (output_primitiveID != nullptr)
+	{
+		PushBarrier(GPUBarrier::Image(output_primitiveID, ResourceState::UNORDERED_ACCESS, output_primitiveID->desc.layout));
+	}
+
 	PushBarrier(GPUBarrier::Image(&output, ResourceState::UNORDERED_ACCESS, output.desc.layout));
 	FlushBarriers(cmd);
 
diff --git a/WickedEngine/wiRenderer.h b/WickedEngine/wiRenderer.h
index 669167f15..623cb0a77 100644
--- a/WickedEngine/wiRenderer.h
+++ b/WickedEngine/wiRenderer.h
@@ -1055,7 +1055,8 @@ namespace wi::renderer
 		const wi::graphics::Texture* output_normal = nullptr,
 		const wi::graphics::Texture* output_depth = nullptr,
 		const wi::graphics::Texture* output_stencil = nullptr,
-		const wi::graphics::Texture* output_depth_stencil = nullptr
+		const wi::graphics::Texture* output_depth_stencil = nullptr,
+		const wi::graphics::Texture* output_primitiveID = nullptr
 	);
 	// Render the scene BVH with ray tracing to the screen
 	void RayTraceSceneBVH(const wi::scene::Scene& scene, wi::graphics::CommandList cmd);
diff --git a/WickedEngine/wiVersion.cpp b/WickedEngine/wiVersion.cpp
index a00d65688..d69556e79 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 = 832;
+	const int revision = 833;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);