minor voxel radiance update

WickedEngine/RendererWindow.cpp

@@ -67,7 +67,7 @@ RendererWindow::RendererWindow(Renderable3DComponent* component)
 	voxelRadianceSecondaryBounceCheckBox->SetCheck(wiRenderer::GetVoxelRadianceSecondaryBounceEnabled());
 	rendererWindow->AddWidget(voxelRadianceSecondaryBounceCheckBox);
 
-	voxelRadianceVoxelSizeSlider = new wiSlider(0.25, 10, 1, 39, "Voxel GI Voxel Size: ");
+	voxelRadianceVoxelSizeSlider = new wiSlider(0.125, 10, 1, 79, "Voxel GI Voxel Size: ");
 	voxelRadianceVoxelSizeSlider->SetTooltip("Adjust the voxel size for Voxel GI calculations.");
 	voxelRadianceVoxelSizeSlider->SetSize(XMFLOAT2(100, 30));
 	voxelRadianceVoxelSizeSlider->SetPos(XMFLOAT2(x, y += 30));

WickedEngine/voxelConeTracingHF.hlsli

@@ -76,7 +76,7 @@ inline float4 ConeTraceReflection(in Texture3D<float4> voxels, in float3 uvw, in
 	float4 accumulation = 0;
 	float3 tc = uvw + coneVec;
 	float rayLengthCorrection = 1 - saturate(dot(N, V));
-	coneVec *= lerp(g_xWorld_VoxelRadianceDataSize * 0.5f, g_xWorld_VoxelRadianceDataSize * 40, pow8(rayLengthCorrection));
+	coneVec *= lerp(g_xWorld_VoxelRadianceDataSize, g_xWorld_VoxelRadianceDataSize * 40, pow8(rayLengthCorrection));
 
 	uint i = 0;
 	while(accumulation.a < 1 && !any(tc - saturate(tc)))
@@ -85,7 +85,7 @@ inline float4 ConeTraceReflection(in Texture3D<float4> voxels, in float3 uvw, in
 
 		tc += coneVec * (1 + mip);
 
-		float4 sam = voxels.SampleLevel(sampler_linear_clamp, tc, mip);
+		float4 sam = voxels.SampleLevel(sampler_point_clamp, tc, mip);
 		accumulation.a += sam.a;
 		accumulation.rgb += sam.rgb * sam.a;
 

WickedEngine/voxelRadianceSecondaryBounceCS.hlsl

@@ -11,7 +11,7 @@ RWTEXTURE3D(output, float4, 0);
 [numthreads(1024, 1, 1)]
 void main( uint3 DTid : SV_DispatchThreadID )
 {
-	uint3 writecoord = to3D(DTid.x, g_xWorld_VoxelRadianceDataRes);
+	const uint3 writecoord = to3D(DTid.x, g_xWorld_VoxelRadianceDataRes);
 
 	float4 emission = input_emission[writecoord];
 
@@ -24,8 +24,6 @@ void main( uint3 DTid : SV_DispatchThreadID )
 		float4 radiance = ConeTraceRadiance(input_emission, uvw, N);
 
 		output[writecoord] = emission + float4(radiance.rgb, 0);
-		//output[writecoord] = float4(radiance.rgb, 1);
-		//output[writecoord] = float4(N, 1);
 	}
 	else
 	{

WickedEngine/voxelSceneCopyClearCS.hlsl

@@ -4,33 +4,27 @@
 #define TEMPORAL_SMOOTHING
 
 RWSTRUCTUREDBUFFER(input_output, VoxelType, 0);
-globallycoherent RWTEXTURE3D(output_emission, float4, 1);
+RWTEXTURE3D(output_emission, float4, 1);
 
 [numthreads(1024, 1, 1)]
 void main( uint3 DTid : SV_DispatchThreadID )
 {
 	VoxelType voxel = input_output[DTid.x];
 
-	float4 color = DecodeColor(voxel.colorMask);
+	const float4 color = DecodeColor(voxel.colorMask);
 
-	uint3 writecoord = to3D(DTid.x, g_xWorld_VoxelRadianceDataRes);
-
-//#ifdef TEMPORAL_SMOOTHING
-//	uint3 loadPrev = writecoord + floor((g_xWorld_VoxelRadianceDataCenter - g_xWorld_VoxelRadianceDataInterpolatedCenter) * float3(1,-1,1));
-//	loadPrev = clamp(loadPrev, 0, g_xWorld_VoxelRadianceDataRes);
-//	float4 colorPrev = output_emission[loadPrev];
-//	DeviceMemoryBarrier();
-//#endif
+	const uint3 writecoord = to3D(DTid.x, g_xWorld_VoxelRadianceDataRes);
 
 	[branch]
 	if (color.a > 0)
 	{
 #ifdef TEMPORAL_SMOOTHING
-		//output_emission[writecoord] = lerp(output_emission[writecoord], float4(color.rgb, 1), 0.1);
-
+		// Blend voxels with the previous frame's data to avoid popping artifacts for dynamic objects:
 		[branch]
 		if (g_xColor.z > 0)
 		{
+			// Do not perform the blend if an offset happened to the voxel grid's center. 
+			// The offset is not accounted for in the blend operation which can introduce severe light leaking.
 			output_emission[writecoord] = float4(color.rgb, 1);
 		}
 		else