Trying to add opacity

res/shaders/BasePass.slang

@@ -34,6 +34,6 @@ float4 fragmentMain(in FragmentParameter params) : SV_Target
     // gamma correction
     result = result / (result + float3(1.0));
     result = pow(result, float3(1.0/2.2));
-    return float4(result, 1.0f);
+    return float4(result, brdf.getAlpha());
 }
             

res/shaders/lib/BRDF.slang

@@ -4,11 +4,13 @@ interface IBRDF
 {
     float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor);
     float3 evaluateAmbient();
+    float getAlpha();
 };
 
 struct Phong : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 specular;
     float3 normal;
     float3 ambient;
@@ -16,6 +18,7 @@ struct Phong : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -33,11 +36,16 @@ struct Phong : IBRDF
     {
         return ambient;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 struct BlinnPhong : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 specularColor;
     float3 normal;
     float shininess;
@@ -45,6 +53,7 @@ struct BlinnPhong : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -62,15 +71,21 @@ struct BlinnPhong : IBRDF
     {
         return ambient;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 struct CelShading : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 normal;
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
     }
 
@@ -94,12 +109,17 @@ struct CelShading : IBRDF
     {
         return float3(0, 0, 0);
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };
 
 // https://learnopengl.com/PBR/Theory
 struct CookTorrance : IBRDF
 {
     float3 baseColor;
+    float alpha;
     float3 normal;
     float roughness;
     float metallic;
@@ -107,6 +127,7 @@ struct CookTorrance : IBRDF
 
     __init()
     {
+        alpha = 1;
         normal = float3(0, 0, 1);
         roughness = 0;
         metallic = 0;
@@ -176,4 +197,8 @@ struct CookTorrance : IBRDF
     {
         return float3(0.03) * baseColor * ambientOcclusion;
     }
+    float getAlpha()
+    {
+        return alpha;
+    }
 };

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;
 };