Trying to add opacity

res/shaders/raytracing/ClosestHit.slang

@@ -39,7 +39,7 @@ void closestHit(inout RayPayload hitValue, in BuiltInTriangleIntersectionAttribu
     LightingParameter lightingParams = params.getLightingParameter();
     MaterialParameter materialParams = params.getMaterialParameter();
 	let brdf = Material.prepare(materialParams);
-    
+
     float3 result = float3(0, 0, 0);
     for(int i = 0; i < pLightEnv.numDirectionalLights; ++i)
     {
@@ -53,5 +53,7 @@ void closestHit(inout RayPayload hitValue, in BuiltInTriangleIntersectionAttribu
     // gamma correction
     result = result / (result + float3(1.0));
     result = pow(result, float3(1.0/2.2));
+
+    
     hitValue.color = result;
 }

res/shaders/raytracing/RayGen.slang

@@ -19,6 +19,7 @@ void raygen()
     rayDesc.TMax = 10000.0;
 
     RayPayload payload;
+    payload.rayDirection = rayDesc.Direction;
     TraceRay(pRayTracingParams.scene, RAY_FLAG_FORCE_OPAQUE, 0xff, 0, 0, 0, rayDesc, payload);
 
     pRayTracingParams.image[int2(LaunchID.xy)] = float4(payload.color, 1.0);

res/shaders/raytracing/RayTracingData.slang

@@ -17,5 +17,6 @@ struct CallablePayload
 
 struct RayPayload
 {
+    float3 rayDirection;
     float3 color;
 };