env light id always 0, handle miss program like sampling env light

keptsecret · keptsecret · commit 5922b3888eac · 2026-02-27T17:07:08.000+07:00
diff --git a/include/nbl/builtin/hlsl/path_tracing/unidirectional.hlsl b/include/nbl/builtin/hlsl/path_tracing/unidirectional.hlsl
@@ -173,8 +173,11 @@ struct Unidirectional
 
     void missProgram(NBL_REF_ARG(ray_type) ray)
     {
-        vector3_type finalContribution = ray.getPayloadThroughput();
-        finalContribution *= nee.get_environment_radiance(ray);
+        vector3_type finalContribution = nee.get_environment_radiance(ray);
+        typename nee_type::light_id_type env_light_id;
+        env_light_id.id = 0u;
+        const scalar_type pdf = nee.deferred_pdf(scene, env_light_id, ray);
+        finalContribution *= ray.foundEmissiveMIS(pdf * pdf);
         ray.addPayloadContribution(finalContribution);
     }
 

Original file line number	Diff line number	Diff line change
`@@ -173,8 +173,11 @@ struct Unidirectional`
`173`	`173`
`174`	`174`	`void missProgram(NBL_REF_ARG(ray_type) ray)`
`175`	`175`	`{`
`176`		`- vector3_type finalContribution = ray.getPayloadThroughput();`
`177`		`- finalContribution *= nee.get_environment_radiance(ray);`
	`176`	`+ vector3_type finalContribution = nee.get_environment_radiance(ray);`
	`177`	`+ typename nee_type::light_id_type env_light_id;`
	`178`	`+ env_light_id.id = 0u;`
	`179`	`+ const scalar_type pdf = nee.deferred_pdf(scene, env_light_id, ray);`
	`180`	`+ finalContribution = ray.foundEmissiveMIS(pdf pdf);`
`178`	`181`	`ray.addPayloadContribution(finalContribution);`
`179`	`182`	`}`
`180`	`183`